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Truncate from i64 to i32 is "free" on x86-32, because it involves

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just discarding one of the registers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97100 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-25 03:04:36 +00:00
parent 0d0840108f
commit 377fbc073c
1 changed files with 2 additions and 2 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@@ -7780,7 +7780,7 @@ bool X86TargetLowering::isTruncateFree(const Type *Ty1, const Type *Ty2) const {
unsigned NumBits2 = Ty2->getPrimitiveSizeInBits(); unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
if (NumBits1 <= NumBits2) if (NumBits1 <= NumBits2)
return false; return false;
return Subtarget->is64Bit() || NumBits1 < 64; return true;
} }
bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const { bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
@@ -7790,7 +7790,7 @@ bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
unsigned NumBits2 = VT2.getSizeInBits(); unsigned NumBits2 = VT2.getSizeInBits();
if (NumBits1 <= NumBits2) if (NumBits1 <= NumBits2)
return false; return false;
return Subtarget->is64Bit() || NumBits1 < 64; return true;
} }
bool X86TargetLowering::isZExtFree(const Type *Ty1, const Type *Ty2) const { bool X86TargetLowering::isZExtFree(const Type *Ty1, const Type *Ty2) const {