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Add a new target hook "predictableSelectIsExpensive".

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This will be used to determine whether it's profitable to turn a select into a
branch when the branch is likely to be predicted.

Currently enabled for everything but Atom on X86 and Cortex-A9 devices on ARM.

I'm not entirely happy with the name of this flag, suggestions welcome ;)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156233 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-05-05 12:49:14 +00:00
parent af87831519
commit aaf723dd2b
4 changed files with 17 additions and 0 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
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@ -824,6 +824,9 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
benefitFromCodePlacementOpt = true;
// Prefer likely predicted branches to selects on out-of-order cores.
predictableSelectIsExpensive = Subtarget->isCortexA9();
setMinFunctionAlignment(Subtarget->isThumb() ? 1 : 2);
}