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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-05-05 12:49:14 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-05-05 12:49:14 +0000 |
| commit | e31f31e5c0b335c161a83bbdb0c9f884248b3ab4 (patch) | |
| tree | 03a92932ea3570ba397516db490386865c3fc4d0 /llvm/lib/Target/ARM/ARMISelLowering.cpp | |
| parent | a25a61b9e80eb84da5b823128a5c873bdb5e4201 (diff) | |
| download | bcm5719-llvm-e31f31e5c0b335c161a83bbdb0c9f884248b3ab4.tar.gz bcm5719-llvm-e31f31e5c0b335c161a83bbdb0c9f884248b3ab4.zip | |
Add a new target hook "predictableSelectIsExpensive".
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 ;)
llvm-svn: 156233
Diffstat (limited to 'llvm/lib/Target/ARM/ARMISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMISelLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp index 711321c6b6d..48cad6173b1 100644 --- a/llvm/lib/Target/ARM/ARMISelLowering.cpp +++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp @@ -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); } |
