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fix minsize detection: minsize attribute implies optimizing for size

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llvm-svn: 244499
This commit is contained in:
Sanjay Patel 2015-08-10 20:45:44 +00:00
parent d7a321e834
commit bea667f5ae
2 changed files with 4 additions and 8 deletions
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7
lib/Target/X86/X86InstrInfo.cpp
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@ -5347,11 +5347,8 @@ MachineInstr *X86InstrInfo::foldMemoryOperandImpl(
// Check switch flag
if (NoFusing) return nullptr;
// Unless optimizing for size, don't fold to avoid partial
// register update stalls
// FIXME: Use Function::optForSize().
if (!MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize) &&
hasPartialRegUpdate(MI->getOpcode()))
// Avoid partial register update stalls unless optimizing for size.
if (!MF.getFunction()->optForSize() && hasPartialRegUpdate(MI->getOpcode()))
return nullptr;
// Determine the alignment of the load.

5
test/CodeGen/X86/sse_partial_update.ll
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@ -113,9 +113,8 @@ define <2 x double> @load_fold_cvtss2sd_int_optsize(<4 x float> *%a) optsize {
define <2 x double> @load_fold_cvtss2sd_int_minsize(<4 x float> *%a) minsize {
; CHECK-LABEL: load_fold_cvtss2sd_int_minsize:
; CHECK: movaps (%rdi), %xmm1
; CHECK-NEXT: xorps %xmm0, %xmm0
; CHECK-NEXT: cvtss2sd %xmm1, %xmm0
; CHECK: xorps %xmm0, %xmm0
; CHECK-NEXT: cvtss2sd (%rdi), %xmm0
; CHECK-NEXT: retq
%ld = load <4 x float>, <4 x float> *%a
%x = call <2 x double> @llvm.x86.sse2.cvtss2sd(<2 x double> <double 0x0, double 0x0>, <4 x float> %ld)