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fix minsize detection: minsize attribute implies optimizing for size

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llvm-svn: 244463
This commit is contained in:
Sanjay Patel 2015-08-10 17:00:44 +00:00
parent ea9a1cc024
commit 5fcdfefe10
2 changed files with 3 additions and 6 deletions
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5
lib/Target/X86/X86ISelLowering.cpp
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@ -24127,10 +24127,7 @@ static SDValue PerformOrCombine(SDNode *N, SelectionDAG &DAG,
return SDValue();
// fold (or (x << c) | (y >> (64 - c))) ==> (shld64 x, y, c)
MachineFunction &MF = DAG.getMachineFunction();
// FIXME: Use Function::optForSize().
bool OptForSize =
MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize);
bool OptForSize = DAG.getMachineFunction().getFunction()->optForSize();
// SHLD/SHRD instructions have lower register pressure, but on some
// platforms they have higher latency than the equivalent

4
test/CodeGen/X86/x86-64-double-shifts-Oz-Os-O2.ll
View File

@ -9,7 +9,7 @@
; return (a << 10) | (b >> 54);
; }
; Function Attrs: minsize nounwind optsize readnone uwtable
; Function Attrs: minsize nounwind readnone uwtable
define i64 @_Z8lshift10mm(i64 %a, i64 %b) #0 {
entry:
; CHECK: shldq $10
@ -19,7 +19,7 @@ entry:
ret i64 %or
}
attributes #0 = { minsize nounwind optsize readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #0 = { minsize nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
; clang -Os -c test2.cpp -emit-llvm -S