Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
//===- BasicTargetTransformInfo.cpp - Basic target-independent TTI impl ---===//
|
|
|
|
|
//
|
|
|
|
|
// The LLVM Compiler Infrastructure
|
|
|
|
|
//
|
|
|
|
|
// This file is distributed under the University of Illinois Open Source
|
|
|
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
|
//
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
/// \file
|
|
|
|
|
/// This file provides the implementation of a basic TargetTransformInfo pass
|
|
|
|
|
/// predicated on the target abstractions present in the target independent
|
|
|
|
|
/// code generator. It uses these (primarily TargetLowering) to model as much
|
|
|
|
|
/// of the TTI query interface as possible. It is included by most targets so
|
|
|
|
|
/// that they can specialize only a small subset of the query space.
|
|
|
|
|
///
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
|
|
#define DEBUG_TYPE "basictti"
|
|
|
|
|
#include "llvm/CodeGen/Passes.h"
|
2013-01-07 11:08:10 +08:00
|
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
#include "llvm/Target/TargetLowering.h"
|
|
|
|
|
#include <utility>
|
|
|
|
|
|
|
|
|
|
using namespace llvm;
|
|
|
|
|
|
|
|
|
|
namespace {
|
|
|
|
|
|
|
|
|
|
class BasicTTI : public ImmutablePass, public TargetTransformInfo {
|
2013-01-12 04:05:37 +08:00
|
|
|
const TargetLoweringBase *TLI;
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
|
|
|
|
|
/// Estimate the overhead of scalarizing an instruction. Insert and Extract
|
|
|
|
|
/// are set if the result needs to be inserted and/or extracted from vectors.
|
|
|
|
|
unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
|
|
|
|
|
|
|
|
|
|
public:
|
|
|
|
|
BasicTTI() : ImmutablePass(ID), TLI(0) {
|
|
|
|
|
llvm_unreachable("This pass cannot be directly constructed");
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-12 04:05:37 +08:00
|
|
|
BasicTTI(const TargetLoweringBase *TLI) : ImmutablePass(ID), TLI(TLI) {
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
initializeBasicTTIPass(*PassRegistry::getPassRegistry());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
virtual void initializePass() {
|
|
|
|
|
pushTTIStack(this);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
virtual void finalizePass() {
|
|
|
|
|
popTTIStack();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
|
|
|
TargetTransformInfo::getAnalysisUsage(AU);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Pass identification.
|
|
|
|
|
static char ID;
|
|
|
|
|
|
|
|
|
|
/// Provide necessary pointer adjustments for the two base classes.
|
|
|
|
|
virtual void *getAdjustedAnalysisPointer(const void *ID) {
|
|
|
|
|
if (ID == &TargetTransformInfo::ID)
|
|
|
|
|
return (TargetTransformInfo*)this;
|
|
|
|
|
return this;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// \name Scalar TTI Implementations
|
|
|
|
|
/// @{
|
|
|
|
|
|
|
|
|
|
virtual bool isLegalAddImmediate(int64_t imm) const;
|
|
|
|
|
virtual bool isLegalICmpImmediate(int64_t imm) const;
|
|
|
|
|
virtual bool isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
|
|
|
|
|
int64_t BaseOffset, bool HasBaseReg,
|
|
|
|
|
int64_t Scale) const;
|
|
|
|
|
virtual bool isTruncateFree(Type *Ty1, Type *Ty2) const;
|
|
|
|
|
virtual bool isTypeLegal(Type *Ty) const;
|
|
|
|
|
virtual unsigned getJumpBufAlignment() const;
|
|
|
|
|
virtual unsigned getJumpBufSize() const;
|
|
|
|
|
virtual bool shouldBuildLookupTables() const;
|
|
|
|
|
|
|
|
|
|
/// @}
|
|
|
|
|
|
|
|
|
|
/// \name Vector TTI Implementations
|
|
|
|
|
/// @{
|
|
|
|
|
|
|
|
|
|
virtual unsigned getNumberOfRegisters(bool Vector) const;
|
2013-01-09 09:15:42 +08:00
|
|
|
virtual unsigned getMaximumUnrollFactor() const;
|
2013-01-10 06:29:00 +08:00
|
|
|
virtual unsigned getRegisterBitWidth(bool Vector) const;
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
|
|
|
|
|
virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
|
|
|
|
|
int Index, Type *SubTp) const;
|
|
|
|
|
virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
|
|
|
|
|
Type *Src) const;
|
|
|
|
|
virtual unsigned getCFInstrCost(unsigned Opcode) const;
|
|
|
|
|
virtual unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
|
|
|
|
|
Type *CondTy) const;
|
|
|
|
|
virtual unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
|
|
|
|
|
unsigned Index) const;
|
|
|
|
|
virtual unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
|
|
|
|
|
unsigned Alignment,
|
|
|
|
|
unsigned AddressSpace) const;
|
|
|
|
|
virtual unsigned getIntrinsicInstrCost(Intrinsic::ID, Type *RetTy,
|
|
|
|
|
ArrayRef<Type*> Tys) const;
|
|
|
|
|
virtual unsigned getNumberOfParts(Type *Tp) const;
|
2013-02-08 22:50:48 +08:00
|
|
|
virtual unsigned getAddressComputationCost(Type *Ty) const;
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
|
|
|
|
|
/// @}
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
INITIALIZE_AG_PASS(BasicTTI, TargetTransformInfo, "basictti",
|
|
|
|
|
"Target independent code generator's TTI", true, true, false)
|
|
|
|
|
char BasicTTI::ID = 0;
|
|
|
|
|
|
|
|
|
|
ImmutablePass *
|
2013-01-12 04:05:37 +08:00
|
|
|
llvm::createBasicTargetTransformInfoPass(const TargetLoweringBase *TLI) {
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
return new BasicTTI(TLI);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::isLegalAddImmediate(int64_t imm) const {
|
|
|
|
|
return TLI->isLegalAddImmediate(imm);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::isLegalICmpImmediate(int64_t imm) const {
|
|
|
|
|
return TLI->isLegalICmpImmediate(imm);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
|
|
|
|
|
int64_t BaseOffset, bool HasBaseReg,
|
|
|
|
|
int64_t Scale) const {
|
2013-01-12 04:05:37 +08:00
|
|
|
TargetLoweringBase::AddrMode AM;
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
AM.BaseGV = BaseGV;
|
|
|
|
|
AM.BaseOffs = BaseOffset;
|
|
|
|
|
AM.HasBaseReg = HasBaseReg;
|
|
|
|
|
AM.Scale = Scale;
|
|
|
|
|
return TLI->isLegalAddressingMode(AM, Ty);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::isTruncateFree(Type *Ty1, Type *Ty2) const {
|
|
|
|
|
return TLI->isTruncateFree(Ty1, Ty2);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::isTypeLegal(Type *Ty) const {
|
|
|
|
|
EVT T = TLI->getValueType(Ty);
|
|
|
|
|
return TLI->isTypeLegal(T);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getJumpBufAlignment() const {
|
|
|
|
|
return TLI->getJumpBufAlignment();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getJumpBufSize() const {
|
|
|
|
|
return TLI->getJumpBufSize();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool BasicTTI::shouldBuildLookupTables() const {
|
|
|
|
|
return TLI->supportJumpTables() &&
|
|
|
|
|
(TLI->isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
|
|
|
|
|
TLI->isOperationLegalOrCustom(ISD::BRIND, MVT::Other));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
//
|
|
|
|
|
// Calls used by the vectorizers.
|
|
|
|
|
//
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getScalarizationOverhead(Type *Ty, bool Insert,
|
|
|
|
|
bool Extract) const {
|
|
|
|
|
assert (Ty->isVectorTy() && "Can only scalarize vectors");
|
|
|
|
|
unsigned Cost = 0;
|
|
|
|
|
|
|
|
|
|
for (int i = 0, e = Ty->getVectorNumElements(); i < e; ++i) {
|
|
|
|
|
if (Insert)
|
|
|
|
|
Cost += TopTTI->getVectorInstrCost(Instruction::InsertElement, Ty, i);
|
|
|
|
|
if (Extract)
|
|
|
|
|
Cost += TopTTI->getVectorInstrCost(Instruction::ExtractElement, Ty, i);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return Cost;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getNumberOfRegisters(bool Vector) const {
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-10 06:29:00 +08:00
|
|
|
unsigned BasicTTI::getRegisterBitWidth(bool Vector) const {
|
|
|
|
|
return 32;
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-09 09:15:42 +08:00
|
|
|
unsigned BasicTTI::getMaximumUnrollFactor() const {
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
|
|
|
unsigned BasicTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty) const {
|
|
|
|
|
// Check if any of the operands are vector operands.
|
|
|
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
|
|
|
assert(ISD && "Invalid opcode");
|
|
|
|
|
|
|
|
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
|
|
|
|
|
|
|
|
|
|
if (TLI->isOperationLegalOrPromote(ISD, LT.second)) {
|
|
|
|
|
// The operation is legal. Assume it costs 1.
|
|
|
|
|
// If the type is split to multiple registers, assume that thre is some
|
|
|
|
|
// overhead to this.
|
|
|
|
|
// TODO: Once we have extract/insert subvector cost we need to use them.
|
|
|
|
|
if (LT.first > 1)
|
|
|
|
|
return LT.first * 2;
|
|
|
|
|
return LT.first * 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!TLI->isOperationExpand(ISD, LT.second)) {
|
|
|
|
|
// If the operation is custom lowered then assume
|
|
|
|
|
// thare the code is twice as expensive.
|
|
|
|
|
return LT.first * 2;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Else, assume that we need to scalarize this op.
|
|
|
|
|
if (Ty->isVectorTy()) {
|
|
|
|
|
unsigned Num = Ty->getVectorNumElements();
|
|
|
|
|
unsigned Cost = TopTTI->getArithmeticInstrCost(Opcode, Ty->getScalarType());
|
|
|
|
|
// return the cost of multiple scalar invocation plus the cost of inserting
|
|
|
|
|
// and extracting the values.
|
|
|
|
|
return getScalarizationOverhead(Ty, true, true) + Num * Cost;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// We don't know anything about this scalar instruction.
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getShuffleCost(ShuffleKind Kind, Type *Tp, int Index,
|
|
|
|
|
Type *SubTp) const {
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getCastInstrCost(unsigned Opcode, Type *Dst,
|
|
|
|
|
Type *Src) const {
|
|
|
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
|
|
|
assert(ISD && "Invalid opcode");
|
|
|
|
|
|
|
|
|
|
std::pair<unsigned, MVT> SrcLT = TLI->getTypeLegalizationCost(Src);
|
|
|
|
|
std::pair<unsigned, MVT> DstLT = TLI->getTypeLegalizationCost(Dst);
|
|
|
|
|
|
2013-01-12 03:54:13 +08:00
|
|
|
// Check for NOOP conversions.
|
|
|
|
|
if (SrcLT.first == DstLT.first &&
|
|
|
|
|
SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) {
|
|
|
|
|
|
|
|
|
|
// Bitcast between types that are legalized to the same type are free.
|
|
|
|
|
if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc)
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (Opcode == Instruction::Trunc &&
|
|
|
|
|
TLI->isTruncateFree(SrcLT.second, DstLT.second))
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
if (Opcode == Instruction::ZExt &&
|
|
|
|
|
TLI->isZExtFree(SrcLT.second, DstLT.second))
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
// If the cast is marked as legal (or promote) then assume low cost.
|
|
|
|
|
if (TLI->isOperationLegalOrPromote(ISD, DstLT.second))
|
|
|
|
|
return 1;
|
|
|
|
|
|
Switch TargetTransformInfo from an immutable analysis pass that requires
a TargetMachine to construct (and thus isn't always available), to an
analysis group that supports layered implementations much like
AliasAnalysis does. This is a pretty massive change, with a few parts
that I was unable to easily separate (sorry), so I'll walk through it.
The first step of this conversion was to make TargetTransformInfo an
analysis group, and to sink the nonce implementations in
ScalarTargetTransformInfo and VectorTargetTranformInfo into
a NoTargetTransformInfo pass. This allows other passes to add a hard
requirement on TTI, and assume they will always get at least on
implementation.
The TargetTransformInfo analysis group leverages the delegation chaining
trick that AliasAnalysis uses, where the base class for the analysis
group delegates to the previous analysis *pass*, allowing all but tho
NoFoo analysis passes to only implement the parts of the interfaces they
support. It also introduces a new trick where each pass in the group
retains a pointer to the top-most pass that has been initialized. This
allows passes to implement one API in terms of another API and benefit
when some other pass above them in the stack has more precise results
for the second API.
The second step of this conversion is to create a pass that implements
the TargetTransformInfo analysis using the target-independent
abstractions in the code generator. This replaces the
ScalarTargetTransformImpl and VectorTargetTransformImpl classes in
lib/Target with a single pass in lib/CodeGen called
BasicTargetTransformInfo. This class actually provides most of the TTI
functionality, basing it upon the TargetLowering abstraction and other
information in the target independent code generator.
The third step of the conversion adds support to all TargetMachines to
register custom analysis passes. This allows building those passes with
access to TargetLowering or other target-specific classes, and it also
allows each target to customize the set of analysis passes desired in
the pass manager. The baseline LLVMTargetMachine implements this
interface to add the BasicTTI pass to the pass manager, and all of the
tools that want to support target-aware TTI passes call this routine on
whatever target machine they end up with to add the appropriate passes.
The fourth step of the conversion created target-specific TTI analysis
passes for the X86 and ARM backends. These passes contain the custom
logic that was previously in their extensions of the
ScalarTargetTransformInfo and VectorTargetTransformInfo interfaces.
I separated them into their own file, as now all of the interface bits
are private and they just expose a function to create the pass itself.
Then I extended these target machines to set up a custom set of analysis
passes, first adding BasicTTI as a fallback, and then adding their
customized TTI implementations.
The fourth step required logic that was shared between the target
independent layer and the specific targets to move to a different
interface, as they no longer derive from each other. As a consequence,
a helper functions were added to TargetLowering representing the common
logic needed both in the target implementation and the codegen
implementation of the TTI pass. While technically this is the only
change that could have been committed separately, it would have been
a nightmare to extract.
The final step of the conversion was just to delete all the old
boilerplate. This got rid of the ScalarTargetTransformInfo and
VectorTargetTransformInfo classes, all of the support in all of the
targets for producing instances of them, and all of the support in the
tools for manually constructing a pass based around them.
Now that TTI is a relatively normal analysis group, two things become
straightforward. First, we can sink it into lib/Analysis which is a more
natural layer for it to live. Second, clients of this interface can
depend on it *always* being available which will simplify their code and
behavior. These (and other) simplifications will follow in subsequent
commits, this one is clearly big enough.
Finally, I'm very aware that much of the comments and documentation
needs to be updated. As soon as I had this working, and plausibly well
commented, I wanted to get it committed and in front of the build bots.
I'll be doing a few passes over documentation later if it sticks.
Commits to update DragonEgg and Clang will be made presently.
llvm-svn: 171681
2013-01-07 09:37:14 +08:00
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// Handle scalar conversions.
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if (!Src->isVectorTy() && !Dst->isVectorTy()) {
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// Scalar bitcasts are usually free.
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if (Opcode == Instruction::BitCast)
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return 0;
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// Just check the op cost. If the operation is legal then assume it costs 1.
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if (!TLI->isOperationExpand(ISD, DstLT.second))
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return 1;
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// Assume that illegal scalar instruction are expensive.
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return 4;
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}
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// Check vector-to-vector casts.
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if (Dst->isVectorTy() && Src->isVectorTy()) {
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// If the cast is between same-sized registers, then the check is simple.
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if (SrcLT.first == DstLT.first &&
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SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) {
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// Assume that Zext is done using AND.
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if (Opcode == Instruction::ZExt)
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return 1;
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// Assume that sext is done using SHL and SRA.
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if (Opcode == Instruction::SExt)
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return 2;
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// Just check the op cost. If the operation is legal then assume it costs
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// 1 and multiply by the type-legalization overhead.
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if (!TLI->isOperationExpand(ISD, DstLT.second))
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return SrcLT.first * 1;
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}
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// If we are converting vectors and the operation is illegal, or
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// if the vectors are legalized to different types, estimate the
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// scalarization costs.
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unsigned Num = Dst->getVectorNumElements();
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unsigned Cost = TopTTI->getCastInstrCost(Opcode, Dst->getScalarType(),
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Src->getScalarType());
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// Return the cost of multiple scalar invocation plus the cost of
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// inserting and extracting the values.
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return getScalarizationOverhead(Dst, true, true) + Num * Cost;
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}
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// We already handled vector-to-vector and scalar-to-scalar conversions. This
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// is where we handle bitcast between vectors and scalars. We need to assume
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// that the conversion is scalarized in one way or another.
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if (Opcode == Instruction::BitCast)
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// Illegal bitcasts are done by storing and loading from a stack slot.
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return (Src->isVectorTy()? getScalarizationOverhead(Src, false, true):0) +
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(Dst->isVectorTy()? getScalarizationOverhead(Dst, true, false):0);
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llvm_unreachable("Unhandled cast");
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}
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unsigned BasicTTI::getCFInstrCost(unsigned Opcode) const {
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// Branches are assumed to be predicted.
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return 0;
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}
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unsigned BasicTTI::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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Type *CondTy) const {
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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// Selects on vectors are actually vector selects.
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if (ISD == ISD::SELECT) {
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assert(CondTy && "CondTy must exist");
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if (CondTy->isVectorTy())
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ISD = ISD::VSELECT;
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}
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(ValTy);
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if (!TLI->isOperationExpand(ISD, LT.second)) {
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// The operation is legal. Assume it costs 1. Multiply
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// by the type-legalization overhead.
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return LT.first * 1;
|
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|
}
|
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// Otherwise, assume that the cast is scalarized.
|
|
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|
|
if (ValTy->isVectorTy()) {
|
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|
unsigned Num = ValTy->getVectorNumElements();
|
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|
if (CondTy)
|
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|
CondTy = CondTy->getScalarType();
|
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unsigned Cost = TopTTI->getCmpSelInstrCost(Opcode, ValTy->getScalarType(),
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|
CondTy);
|
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|
|
// Return the cost of multiple scalar invocation plus the cost of inserting
|
|
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|
// and extracting the values.
|
|
|
|
|
return getScalarizationOverhead(ValTy, true, false) + Num * Cost;
|
|
|
|
|
}
|
|
|
|
|
|
|
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|
|
// Unknown scalar opcode.
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
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|
|
unsigned BasicTTI::getVectorInstrCost(unsigned Opcode, Type *Val,
|
|
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|
|
unsigned Index) const {
|
|
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|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getMemoryOpCost(unsigned Opcode, Type *Src,
|
|
|
|
|
unsigned Alignment,
|
|
|
|
|
unsigned AddressSpace) const {
|
|
|
|
|
assert(!Src->isVoidTy() && "Invalid type");
|
|
|
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Src);
|
|
|
|
|
|
|
|
|
|
// Assume that all loads of legal types cost 1.
|
|
|
|
|
return LT.first;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID, Type *RetTy,
|
|
|
|
|
ArrayRef<Type *> Tys) const {
|
|
|
|
|
// assume that we need to scalarize this intrinsic.
|
|
|
|
|
unsigned ScalarizationCost = 0;
|
|
|
|
|
unsigned ScalarCalls = 1;
|
|
|
|
|
if (RetTy->isVectorTy()) {
|
|
|
|
|
ScalarizationCost = getScalarizationOverhead(RetTy, true, false);
|
|
|
|
|
ScalarCalls = std::max(ScalarCalls, RetTy->getVectorNumElements());
|
|
|
|
|
}
|
|
|
|
|
for (unsigned i = 0, ie = Tys.size(); i != ie; ++i) {
|
|
|
|
|
if (Tys[i]->isVectorTy()) {
|
|
|
|
|
ScalarizationCost += getScalarizationOverhead(Tys[i], false, true);
|
|
|
|
|
ScalarCalls = std::max(ScalarCalls, RetTy->getVectorNumElements());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return ScalarCalls + ScalarizationCost;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
unsigned BasicTTI::getNumberOfParts(Type *Tp) const {
|
|
|
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Tp);
|
|
|
|
|
return LT.first;
|
|
|
|
|
}
|
2013-02-08 22:50:48 +08:00
|
|
|
|
|
|
|
|
unsigned BasicTTI::getAddressComputationCost(Type *Ty) const {
|
|
|
|
|
return 0;
|
|
|
|
|
}
|