Summary:
There is no change to the restrictions, just the result register is stored
once in the encoding rather than twice. The rt field is zero in
MIPS32r6/MIPS64r6.
Depends on D4119
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4120
llvm-svn: 211019
Summary:
The linked-load, store-conditional operations have been re-encoded such
that have a 9-bit offset instead of the 16-bit offset they have prior to
MIPS32r6/MIPS64r6.
While implementing this, I noticed that the atomic load/store pseudos always
emit a sign extension using sll and sra. I have improved this to use seb/seh
when they are available (MIPS32r2/MIPS64r2 and above).
Depends on D4118
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4119
llvm-svn: 211018
Summary:
The error message for the invalid.s cases isn't very helpful. It happens because
there is an instruction with a wider immediate that would have matched if the
NotMips32r6 predicate were true. I have some WIP to improve the message but it
affects most error messages for removed/re-encoded instructions on
MIPS32r6/MIPS64r6 and should therefore be a separate commit.
Depens on D4115
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4117
llvm-svn: 211012
Summary:
cache and pref were added in MIPS-III, and MIPS32 but were re-encoded in
MIPS32r6/MIPS64r6 to use a 9-bit offset rather than the 16-bit offset
available to earlier cores.
Resolved the decoding conflict between pref and lwc3.
Depends on D4115
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4116
llvm-svn: 210900
Summary:
b(ge|lt)zal have been removed in MIPS32r6/MIPS64r6. However, bal (an alias
for 'bgezal $zero, $offset') still remains with the same encoding it had
prior to MIPS32r6/MIPS64r6.
Updated the MipsNaCLELFStreamer, and MipsLongBranch to correctly handle the
MIPS32r6/MIPS64r6 BAL instruction in addition to the existing BAL_BR pseudo.
No changes were required to the CodeGen test that looks for BAL
(test/CodeGen/Mips/longbranch.ll) since the new instruction has the same
syntax.
Depends on D4113
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4114
llvm-svn: 210898
Summary:
Folded mips64-fp-indexed-ls.ll into fp-indexed-ls.ll. To do so, the zext's in
mips64-fp-indexed-ls.ll were changed to implicit sign extensions (performed
by getelementptr). This does not affect the purpose of the test.
Depends on D4004
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D4110
llvm-svn: 210784
Summary:
c.cond.fmt has been replaced by cmp.cond.fmt. Where c.cond.fmt wrote to
dedicated condition registers, cmp.cond.fmt writes 1 or 0 to normal FGR's
(like the GPR comparisons).
mov[fntz] have been replaced by seleqz and selnez. These instructions
conditionally zero a register based on a bool in a GPR. The results can
then be or'd together to act as a select without, for example, requiring a third
register read port.
mov[fntz].[ds] have been replaced with sel.[ds]
MIPS64r6 currently generates unnecessary sign-extensions for most selects.
This is because the result of a SETCC is currently an i32. Bits 32-63 are
undefined in i32 and the behaviour of seleqz/selnez would otherwise depend
on undefined bits. Later, we will fix this by making the result of SETCC an
i64 on MIPS64 targets.
Depends on D3958
Reviewers: jkolek, vmedic, zoran.jovanovic
Reviewed By: vmedic, zoran.jovanovic
Differential Revision: http://reviews.llvm.org/D4003
llvm-svn: 210777
Summary:
This patch updates both the assembler and the code generator.
MIPS32r6/MIPS64r6 replaces them with maddf.[ds] and msubf.[ds] which are fused
multiply-add/sub operations. We don't emit these yet, this patch only prevents the removed instructions from being emitted.
Depends on D3955
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3956
llvm-svn: 210763
Summary:
This patch disables madd/maddu/msub/msubu in both the assembler and code
generator.
Depends on D3896
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3955
llvm-svn: 210762
Summary:
The accumulator-based (HI/LO) multiplies and divides from earlier ISA's have
been removed and replaced with GPR-based equivalents. For example:
div $1, $2
mflo $3
is now:
div $3, $1, $2
This patch disables the accumulator-based multiplies and divides for
MIPS32r6/MIPS64r6 and uses the GPR-based equivalents instead.
Renamed expandPseudoDiv to insertDivByZeroTrap to better describe the
behaviour of the function.
MipsDelaySlotFiller now invalidates the liveness information when moving
instructions to the delay slot. Without this, divrem.ll will abort since
%GP ends up used before it is defined.
Reviewers: vmedic, zoran.jovanovic, jkolek
Reviewed By: jkolek
Differential Revision: http://reviews.llvm.org/D3896
llvm-svn: 210760
Summary: These instructions are available in ISAs >= mips32/mips64. For mips32r6/mips64r6, jr.hb has a new encoding format.
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D4019
llvm-svn: 210654
Summary:
Instead the system is required to provide some means of handling unaligned
load/store without special instructions. Options include full hardware
support, full trap-and-emulate, and hybrids such as hardware support within
a cache line and trap-and-emulate for multi-line accesses.
MipsSETargetLowering::allowsUnalignedMemoryAccesses() has been configured to
assume that unaligned accesses are 'fast' on the basis that I expect few
hardware implementations will opt for pure-software handling of unaligned
accesses. The ones that do handle it purely in software can override this.
mips64-load-store-left-right.ll has been merged into load-store-left-right.ll
The stricter testing revealed a Bits!=Bytes bug in passByValArg(). This has
been fixed and the variables renamed to clarify the units they hold.
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3872
llvm-svn: 209512
Summary: Depends on D3787. Tablegen will raise an assertion without it.
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3842
llvm-svn: 209419
Certainly not without having a custom PrintMethod to invert the immediate
beforehand. But probably not at all.
This will be tested when the TableGen "should I print this Alias" heuristic is
fixed (very soon).
llvm-svn: 208964
Summary:
No support for symbols in place of the immediate yet since it requires new
relocations.
Depends on D3671
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3689
llvm-svn: 208858
Summary:
This required a new instruction group representing the 32-bit subset of
MIPS-3 that was available in MIPS32R2.
To limit the number of tests required, only one 32-bit and one 64-bit ISA
prior to MIPS32/MIPS64 are tested.
rdhwr has been deliberately left without an ISA annotation for now. This is
because the assembler and CodeGen disagree on when the instruction is
available. Strictly speaking, it is only available in MIPS32r2 and
MIPS64r2. However, it is emulated by a kernel trap on earlier ISA's and is
necessary for TLS so CodeGen should emit it on older ISA's too.
Depends on D3696
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3697
llvm-svn: 208690
Summary:
We are currently very close to the 32-bit limit of the current assembler
implementation. This is because there is no way to represent an instruction
that is available in, for example, Mips3 or Mips32. We have to define a
feature bit that represents this.
This patch cleans up a pair of redundant feature bits and slightly postpones the
point we will reach the limit.
Reviewers: zoran.jovanovic, jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3703
llvm-svn: 208685
Summary: The 'mul' line of the test is temporarily commented out because it currently matches the MIPS32 mul instead of the MIPS32r6 mul. This line will be uncommented when we disable the MIPS32 mul on MIPS32r6.
Reviewers: jkolek, zoran.jovanovic, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3668
llvm-svn: 208576
Summary:
To limit the number of tests required, only one 32-bit and one 64-bit ISA
prior to MIPS32/MIPS64 are explicitly tested.
Depends on D3695
Reviewers: vmedic
Differential Revision: http://reviews.llvm.org/D3696
llvm-svn: 208549
Summary:
This required a new instruction group representing the 32-bit subset of
MIPS-V that was available in MIPS32R2
Most of these instructions are correctly rejected but with the wrong error
message. These have been placed in a separate test for now. It happens
because many of the MIPS V instructions have not been implemented.
Depends on D3694
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3695
llvm-svn: 208546
Summary:
DCL[ZO] are now correctly marked as being MIPS64 instructions. This has no
effect on the CodeGen tests since expansion of i64 prevented their use
anyway.
The check for MIPS16 to prevent the use of CLZ no longer prevents DCLZ as
well. This is not a functional change since DCLZ is still prohibited by
being a MIPS64 instruction (MIPS16 is only compatible with MIPS32).
No functional change
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3694
llvm-svn: 208544
Summary:
dsbh and dshd are not available on Mips32r2. No codegen test changes
required since expansion of i64 prevented the use of these instructions
anyway.
Depends on D3690
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3692
llvm-svn: 208542
Summary:
No functional change.
The minor change to the MIPS16 code is in preparation for a patch that will handle 32-bit FPIdx instructions separately to 64-bit (because they were added in different revisions)
Depends on D3677
Reviewers: rkotler, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3690
llvm-svn: 208541
Summary:
This required a new instruction group representing the 32-bit subset of
MIPS-IV that was available in MIPS32
A small number of instructions are correctly rejected but with the wrong error
message. These have been placed in a separate test for now.
Depends on D3676
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3677
llvm-svn: 208414
Summary:
This required a new instruction group representing the 32-bit subset of
MIPS-III that was available in MIPS32
A small number of instructions are correctly rejected but with the wrong error
message. These have been placed in a separate test for now.
There's some obvious InstAlias's that ought to be marked MIPS-III but arent.
This is because they are not currently tested. I intend to catch these with
a final pass through the tablegen records to find tablegen records without
ISA annotations.
Depends on D3674
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3675
llvm-svn: 208408
Summary:
Adds MIPS32r6/MIPS64r6 and checks the compatibility requirements for these
processors.
I've also included comments to describe removed and re-encoded instructions,
along with placeholder def's for the new instructions but there are no
functional changes to codegen at this point.
Reviewers: jkolek, vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3622
llvm-svn: 208399
Summary:
A small number of instructions are rejected with the wrong error message.
These have been placed in a separate test for now. There seems to be some
parsing quirk that triggers when these instructions are disabled.
Depends on D3571
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3647
llvm-svn: 208305
Summary:
One small functional change. The recently added PAUSE instruction now has
the HasStdEnc predicate which was accidentally removed by a Requires<>.
Depends on D3640
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3641
llvm-svn: 208209
Summary:
The overall idea is to chop the Predicates list into subsets that are
usually overridden independently. This allows subclasses to partially
override the predicates of their superclasses without having to re-add all
the existing predicates.
This patch starts the process by moving HasStdEnc into a new
EncodingPredicates list and almost everything else into
AdditionalPredicates.
It has revealed a couple likely bugs where 'let Predicates' has removed
the HasStdEnc predicate.
No functional change (confirmed by diffing tablegen-erated files).
Depends on D3549, D3506
Reviewers: vmedic
Differential Revision: http://reviews.llvm.org/D3550
llvm-svn: 208184
Summary:
This will make it easier to prove that a more complicated change in the
following commit is non-functional.
No functional change.
Depends on D3506
Reviewers: vmedic
Reviewed By: vmedic
Differential Revision: http://reviews.llvm.org/D3549
llvm-svn: 208179
Summary: negu $reg is equivalent to negu $reg, $reg.
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D3510
llvm-svn: 207673
Summary:
The pattern sltu $r1, $r2, $imm is found in handwritten assembly which
is just a shorthand version of sltui $r1, $r2, $imm.
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D3508
llvm-svn: 207671
Summary:
The pattern sll/srl $rd, $rt, $rs is found in handwritten assembly which
is just a shorthand version of sllv/srlv $rd, $rt, $rs.
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D3483
llvm-svn: 207657
target cannot be determined accurately. This is the case for NaCl where the
sandboxing instructions are added in MC layer, after the MipsLongBranch pass.
It is also the case when the code has inline assembly. Instead of calculating
offset in the MipsLongBranch pass, use %hi(sym1 - sym2) and %lo(sym1 - sym2)
expressions that are resolved during the fixup.
This patch also deletes microMIPS test file test/CodeGen/Mips/micromips-long-branch.ll
and implements microMIPS CHECKs in a much simpler way in a file
test/CodeGen/Mips/longbranch.ll, together with MIPS32 and MIPS64.
llvm-svn: 207656
Summary:
The MipsPat class already initializes Predicates to [HasStdEnc].
No functional change (confirmed by diffing tablegen-erated files before and
after)
Differential Revision: http://reviews.llvm.org/D3546
llvm-svn: 207548
This enables TableGen to generate an additional two operand
matcher for our shift_rotate_imm and shift_rotate_reg class of instructions.
The tests were also updated so that they include now encoding information
for all affected instructions.
llvm-svn: 206398
Summary:
- Conditional moves acting on 64-bit GPR's should require MIPS-IV rather than MIPS64
- ISD::MUL, and ISD::MULH[US] should be lowered on all 64-bit ISA's
Patch by David Chisnall
His work was sponsored by: DARPA, AFRL
I've added additional testcases to cover as much of the codegen changes
affecting MIPS-IV as I can. Where I've been unable to find an existing
MIPS64 testcase that can be re-used for MIPS-IV (mainly tests covering
ISD::GlobalAddress and similar), I at least agree that MIPS-IV should
behave like MIPS64. Further testcases that are fixed by this patch will follow
in my next commit. The testcases from that commit that fail for MIPS-IV without
this patch are:
LLVM :: CodeGen/Mips/2010-07-20-Switch.ll
LLVM :: CodeGen/Mips/cmov.ll
LLVM :: CodeGen/Mips/eh-dwarf-cfa.ll
LLVM :: CodeGen/Mips/largeimmprinting.ll
LLVM :: CodeGen/Mips/longbranch.ll
LLVM :: CodeGen/Mips/mips64-f128.ll
LLVM :: CodeGen/Mips/mips64directive.ll
LLVM :: CodeGen/Mips/mips64ext.ll
LLVM :: CodeGen/Mips/mips64fpldst.ll
LLVM :: CodeGen/Mips/mips64intldst.ll
LLVM :: CodeGen/Mips/mips64load-store-left-right.ll
LLVM :: CodeGen/Mips/sint-fp-store_pattern.ll
Reviewers: dsanders
Reviewed By: dsanders
CC: matheusalmeida
Differential Revision: http://reviews.llvm.org/D3343
llvm-svn: 206183
Summary:
Similarly, the HasMips64 on the 64-bit move InstAlias is a test for 64-bit
GPR's.
No functional change.
Reviewers: matheusalmeida
Reviewed By: matheusalmeida
Differential Revision: http://reviews.llvm.org/D3263
llvm-svn: 205968
Summary:
They behave in accordance with the Has2008 and ABS2008 configuration bits of the processor which are used to select between the 1985 and 2008 versions of IEEE 754. In 1985 mode, these instructions are arithmetic (i.e. they raise invalid operation exceptions when given NaN), in 2008 mode they are non-arithmetic (i.e. they are copies).
nmadd.[ds], and nmsub.[ds] are still subject to -enable-no-nans-fp-math because the ISA spec does not explicitly state that they obey Has2008 and ABS2008.
Fixed the issue with the previous version of this patch (r205628). A pre-existing 'let Predicate =' statement was removing some predicates that were necessary for FP64 to behave correctly.
Reviewers: matheusalmeida
Reviewed By: matheusalmeida
Differential Revision: http://llvm-reviews.chandlerc.com/D3274
llvm-svn: 205844
Summary:
They behave in accordance with the Has2008 and ABS2008 configuration bits of the
processor which are used to select between the 1985 and 2008 versions of IEEE
754. In 1985 mode, these instructions are arithmetic (i.e. they raise invalid
operation exceptions when given NaN), in 2008 mode they are non-arithmetic
(i.e. they are copies).
nmadd.[ds], and nmsub.[ds] are still subject to -enable-no-nans-fp-math because
the ISA spec does not explicitly state that they obey Has2008 and ABS2008.
Reviewers: matheusalmeida
Reviewed By: matheusalmeida
Differential Revision: http://llvm-reviews.chandlerc.com/D3274
llvm-svn: 205628
Summary:
Highlights:
- Registers are resolved much later (by the render method).
Prior to that point, GPR32's/GPR64's are GPR's regardless of register
size. Similarly FGR32's/FGR64's/AFGR64's are FGR's regardless of register
size or FR mode. Numeric registers can be anything.
- All registers are parsed the same way everywhere (even when handling
symbol aliasing)
- One consequence is that all registers can be specified numerically
almost anywhere (e.g. $fccX, $wX). The exception is symbol aliasing
but that can be easily resolved.
- Removes the need for the hasConsumedDollar hack
- Parenthesis and Bracket suffixes are handled generically
- Micromips instructions are parsed directly instead of going through the
standard encodings first.
- rdhwr accepts all 32 registers, and the following instructions that previously
xfailed now work:
ddiv, ddivu, div, divu, cvt.l.[ds], se[bh], wsbh, floor.w.[ds], c.ngl.d,
c.sf.s, dsbh, dshd, madd.s, msub.s, nmadd.s, nmsub.s, swxc1
- Diagnostics involving registers point at the correct character (the $)
- There's only one kind of immediate in MipsOperand. LSA immediates are handled
by the predicate and renderer.
Lowlights:
- Hardcoded '$zero' in the div patterns is handled with a hack.
MipsOperand::isReg() will return true for a k_RegisterIndex token
with Index == 0 and getReg() will return ZERO for this case. Note that it
doesn't return ZERO_64 on isGP64() targets.
- I haven't cleaned up all of the now-unused functions.
Some more of the generic parser could be removed too (integers and relocs
for example).
- insve.df needed a custom decoder to handle the implicit fourth operand that
was needed to make it parse correctly. The difficulty was that the matcher
expected a Token<'0'> but gets an Imm<0>. Adding an implicit zero solved this.
Reviewers: matheusalmeida, vmedic
Reviewed By: matheusalmeida
Differential Revision: http://llvm-reviews.chandlerc.com/D3222
llvm-svn: 205292
Summary:
Highlights:
- Registers are resolved much later (by the render method).
Prior to that point, GPR32's/GPR64's are GPR's regardless of register
size. Similarly FGR32's/FGR64's/AFGR64's are FGR's regardless of register
size or FR mode. Numeric registers can be anything.
- All registers are parsed the same way everywhere (even when handling
symbol aliasing)
- One consequence is that all registers can be specified numerically
almost anywhere (e.g. $fccX, $wX). The exception is symbol aliasing
but that can be easily resolved.
- Removes the need for the hasConsumedDollar hack
- Parenthesis and Bracket suffixes are handled generically
- Micromips instructions are parsed directly instead of going through the
standard encodings first.
- rdhwr accepts all 32 registers, and the following instructions that previously
xfailed now work:
ddiv, ddivu, div, divu, cvt.l.[ds], se[bh], wsbh, floor.w.[ds], c.ngl.d,
c.sf.s, dsbh, dshd, madd.s, msub.s, nmadd.s, nmsub.s, swxc1
- Diagnostics involving registers point at the correct character (the $)
- There's only one kind of immediate in MipsOperand. LSA immediates are handled
by the predicate and renderer.
Lowlights:
- Hardcoded '$zero' in the div patterns is handled with a hack.
MipsOperand::isReg() will return true for a k_RegisterIndex token
with Index == 0 and getReg() will return ZERO for this case. Note that it
doesn't return ZERO_64 on isGP64() targets.
- I haven't cleaned up all of the now-unused functions.
Some more of the generic parser could be removed too (integers and relocs
for example).
- insve.df needed a custom decoder to handle the implicit fourth operand that
was needed to make it parse correctly. The difficulty was that the matcher
expected a Token<'0'> but gets an Imm<0>. Adding an implicit zero solved this.
Reviewers: matheusalmeida, vmedic
Reviewed By: matheusalmeida
Differential Revision: http://llvm-reviews.chandlerc.com/D3222
llvm-svn: 205229
This enables TableGen to generate an additional two operand matcher
for our ArithLogicR class of instructions (constituted by 3 register operands).
E.g.: and $1, $2 <=> and $1, $1, $2
llvm-svn: 204826
The Octeon cpu from Cavium Networks is mips64r2 based and has an extended
instruction set. In order to utilize this with LLVM, a new cpu feature "octeon"
and a subtarget feature "cnmips" is added. A small set of new instructions
(baddu, dmul, pop, dpop, seq, sne) is also added. LLVM generates dmul, pop and
dpop instructions with option -mcpu=octeon or -mattr=+cnmips.
llvm-svn: 204337
Summary:
Parts of the compiler still believed MSA load/stores have a 16-bit offset when
it is actually 10-bit. Corrected this, and fixed a closely related issue this
uncovered where load/stores with 10-bit and 12-bit offsets (MSA and microMIPS
respectively) could not load/store using offsets from the stack/frame pointer.
They accepted frameindex+offset, but not frameindex by itself.
Reviewers: jacksprat, matheusalmeida
Reviewed By: jacksprat
Differential Revision: http://llvm-reviews.chandlerc.com/D2888
llvm-svn: 202717
This patch adds NaCl target for Mips. It also forbids indexed loads and
stores if the target is NaCl.
Patch by Sasa Stankovic.
Differential Revision: http://llvm-reviews.chandlerc.com/D2690
llvm-svn: 200855
IIImul -> II_MUL
IIImult -> II_MULT, II_MULTU, II_MADD, II_MADDU, II_MSUB, II_MSUBU, II_DMULT, II_DMULTU
No functional change since the InstrItinData's have been duplicated.
llvm-svn: 199495
This is necessary because the classes are shared between all implementations.
No functional change since the InstrItinData's have been duplicated.
llvm-svn: 199394
IIArith -> II_ADD, II_ADDU, II_AND, II_CL[ZO], II_DADDIU, II_DADDU,
II_DROTR, II_DROTR32, II_DROTRV, II_DSLL, II_DSLL32, II_DSLLV,
II_DSR[AL], II_DSR[AL]32, II_DSR[AL]V, II_DSUBU, II_LUI, II_MOV[ZFNT],
II_NOR, II_OR, II_RDHWR, II_ROTR, II_ROTRV, II_SLL, II_SLLV, II_SR[AL],
II_SR[AL]V, II_SUBU, II_XOR
No functional change since the InstrItinData's have been duplicated.
This is necessary because the classes are shared between all schedulers.
Once this patch series is committed there will be an InstrItinClass for
each mnemonic with minimal grouping. This does increase the size of the
itinerary tables for each MIPS scheduler but we have a few options for dealing
with that later. These options include reducing the number of classes once
we see the best way to simplify them, or by extending tablegen to be able
to compress the table by eliminating duplicates entries, etc.
llvm-svn: 199391
not being correctly encoded/decoded.
In more detail, immediate fields of LD/ST instructions should be
divided/multiplied by the size of the data format before encoding and
after decoding, respectively.
llvm-svn: 196494
Before I just ported the shell of the pass. I've tried to keep everything
nearly identical to the ARM version. I think it will be very easy to eventually
merge these two and create a new more general pass that other targets can
use. I have some improvements I would like to make to allow pools to
be shared across functions and some other things. When I'm all done we
can think about making a more general pass. More to be ported but the
basic mechanism works now almost as good as gcc mips16.
llvm-svn: 193509
accumulator instead of its sub-registers, $hi and $lo.
We need this change to prevent a mflo following a mtlo from reading an
unpredictable/undefined value, as shown in the following example:
mult $6, $7 // result of $6 * $7 is written to $lo and $hi.
mflo $2 // read lower 32-bit result from $lo.
mtlo $4 // write to $lo. the content of $hi becomes unpredictable.
mfhi $3 // read higher 32-bit from $hi, which has an unpredictable value.
I don't have a test case for this change that reliably reproduces the problem.
llvm-svn: 192119
Matheus Almeida