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Add X86 LZCNT instruction. Including instruction selection support. 

llvm-svn: 141651
This commit is contained in:
Craig Topper 2011-10-11 06:44:02 +00:00
parent 77c1f9f888
commit 271064e873
7 changed files with 65 additions and 7 deletions
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6
llvm/lib/Target/X86/X86.td
View File

@ -7,8 +7,8 @@
//
//===----------------------------------------------------------------------===//
//
// This is a target description file for the Intel i386 architecture, referred to
// here as the "X86" architecture.
// This is a target description file for the Intel i386 architecture, referred
// to here as the "X86" architecture.
//
//===----------------------------------------------------------------------===//
@ -102,6 +102,8 @@ def FeatureRDRAND : SubtargetFeature<"rdrand", "HasRDRAND", "true",
"Support RDRAND instruction">;
def FeatureF16C : SubtargetFeature<"f16c", "HasF16C", "true",
"Support 16-bit floating point conversion instructions">;
def FeatureLZCNT : SubtargetFeature<"lzcnt", "HasLZCNT", "true",
"Support LZCNT instruction">;
//===----------------------------------------------------------------------===//
// X86 processors supported.

15
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -380,14 +380,19 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
setOperationAction(ISD::CTTZ , MVT::i8 , Custom);
setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
if (Subtarget->is64Bit()) {
if (Subtarget->is64Bit())
setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
if (Subtarget->hasLZCNT()) {
setOperationAction(ISD::CTLZ , MVT::i8 , Promote);
} else {
setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
if (Subtarget->is64Bit())
setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
}
if (Subtarget->hasPOPCNT()) {

27
llvm/lib/Target/X86/X86InstrInfo.td
View File

@ -476,6 +476,7 @@ def HasFMA4 : Predicate<"Subtarget->hasFMA4()">;
def HasMOVBE : Predicate<"Subtarget->hasMOVBE()">;
def HasRDRAND : Predicate<"Subtarget->hasRDRAND()">;
def HasF16C : Predicate<"Subtarget->hasF16C()">;
def HasLZCNT : Predicate<"Subtarget->hasLZCNT()">;
def FPStackf32 : Predicate<"!Subtarget->hasXMM()">;
def FPStackf64 : Predicate<"!Subtarget->hasXMMInt()">;
def HasCmpxchg16b: Predicate<"Subtarget->hasCmpxchg16b()">;
@ -1339,6 +1340,32 @@ let Predicates = [HasRDRAND], Defs = [EFLAGS] in {
"rdrand{q}\t$dst", []>, TB;
}
//===----------------------------------------------------------------------===//
// LZCNT Instruction
//
let Predicates = [HasLZCNT], Defs = [EFLAGS] in {
def LZCNT16rr : I<0xBD, MRMSrcReg, (outs GR16:$dst), (ins GR16:$src),
"lzcnt{w}\t{$src, $dst|$dst, $src}",
[(set GR16:$dst, (ctlz GR16:$src))]>, XS, OpSize;
def LZCNT16rm : I<0xBD, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$src),
"lzcnt{w}\t{$src, $dst|$dst, $src}",
[(set GR16:$dst, (ctlz (loadi16 addr:$src)))]>, XS, OpSize;
def LZCNT32rr : I<0xBD, MRMSrcReg, (outs GR32:$dst), (ins GR32:$src),
"lzcnt{l}\t{$src, $dst|$dst, $src}",
[(set GR32:$dst, (ctlz GR32:$src))]>, XS;
def LZCNT32rm : I<0xBD, MRMSrcMem, (outs GR32:$dst), (ins i32mem:$src),
"lzcnt{l}\t{$src, $dst|$dst, $src}",
[(set GR32:$dst, (ctlz (loadi32 addr:$src)))]>, XS;
def LZCNT64rr : RI<0xBD, MRMSrcReg, (outs GR64:$dst), (ins GR64:$src),
"lzcnt{q}\t{$src, $dst|$dst, $src}",
[(set GR64:$dst, (ctlz GR64:$src))]>, XS;
def LZCNT64rm : RI<0xBD, MRMSrcMem, (outs GR64:$dst), (ins i64mem:$src),
"lzcnt{q}\t{$src, $dst|$dst, $src}",
[(set GR64:$dst, (ctlz (loadi64 addr:$src)))]>, XS;
}
//===----------------------------------------------------------------------===//
// Subsystems.
//===----------------------------------------------------------------------===//

5
llvm/lib/Target/X86/X86Subtarget.cpp
View File

@ -255,6 +255,10 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
HasX86_64 = true;
ToggleFeature(X86::Feature64Bit);
}
if ((ECX >> 5) & 0x1) {
HasLZCNT = true;
ToggleFeature(X86::FeatureLZCNT);
}
if (IsAMD && ((ECX >> 6) & 0x1)) {
HasSSE4A = true;
ToggleFeature(X86::FeatureSSE4A);
@ -285,6 +289,7 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
, HasMOVBE(false)
, HasRDRAND(false)
, HasF16C(false)
, HasLZCNT(false)
, IsBTMemSlow(false)
, IsUAMemFast(false)
, HasVectorUAMem(false)

4
llvm/lib/Target/X86/X86Subtarget.h
View File

@ -99,6 +99,9 @@ protected:
/// HasF16C - Processor has 16-bit floating point conversion instructions.
bool HasF16C;
/// HasLZCNT - Processor has LZCNT instruction.
bool HasLZCNT;
/// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
bool IsBTMemSlow;
@ -184,6 +187,7 @@ public:
bool hasMOVBE() const { return HasMOVBE; }
bool hasRDRAND() const { return HasRDRAND; }
bool hasF16C() const { return HasF16C; }
bool hasLZCNT() const { return HasLZCNT; }
bool isBTMemSlow() const { return IsBTMemSlow; }
bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
bool hasVectorUAMem() const { return HasVectorUAMem; }

9
llvm/test/MC/Disassembler/X86/simple-tests.txt
View File

@ -488,3 +488,12 @@
# CHECK: popcntq %rax, %rax
0xf3 0x48 0x0f 0xb8 0xc0
# CHECK: lzcntl %eax, %eax
0xf3 0x0f 0xbd 0xc0
# CHECK: lzcntw %ax, %ax
0x66 0xf3 0x0f 0xbd 0xc0
# CHECK: lzcntq %rax, %rax
0xf3 0x48 0x0f 0xbd 0xc0

6
llvm/test/MC/Disassembler/X86/x86-32.txt
View File

@ -471,3 +471,9 @@
# CHECK: popcntw %ax, %ax
0x66 0xf3 0x0f 0xb8 0xc0
# CHECK: lzcntl %eax, %eax
0xf3 0x0f 0xbd 0xc0
# CHECK: lzcntw %ax, %ax
0x66 0xf3 0x0f 0xbd 0xc0