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fix minsize detection: minsize attribute implies optimizing for size

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Also, add a test for optsize because this was not part of any existing regression test.

llvm-svn: 244651
This commit is contained in:
Sanjay Patel 2015-08-11 19:39:36 +00:00
parent 41c8aefa76
commit b7a56def6f
2 changed files with 16 additions and 2 deletions
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3
lib/CodeGen/CodeGenPrepare.cpp
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@ -214,8 +214,7 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
TLI = TM->getSubtargetImpl(F)->getTargetLowering();
TLInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
// FIXME: Use Function::optForSize().
OptSize = F.hasFnAttribute(Attribute::OptimizeForSize);
OptSize = F.optForSize();
/// This optimization identifies DIV instructions that can be
/// profitably bypassed and carried out with a shorter, faster divide.

15
test/CodeGen/X86/slow-div.ll
View File

@ -25,4 +25,19 @@ entry:
ret i64 %div
}
; Verify that no extra code is generated when optimizing for size.
define i32 @div32_optsize(i32 %a, i32 %b) optsize {
; DIV32-LABEL: div32_optsize:
; DIV32-NOT: divb
%div = sdiv i32 %a, %b
ret i32 %div
}
define i32 @div32_minsize(i32 %a, i32 %b) minsize {
; DIV32-LABEL: div32_minsize:
; DIV32-NOT: divb
%div = sdiv i32 %a, %b
ret i32 %div
}