From aaf723dd2bccc052d2dd28e3cc4db76f2a3e2fb0 Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Sat, 5 May 2012 12:49:14 +0000 Subject: 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 ;) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156233 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/ARMISelLowering.cpp | 3 +++ 1 file changed, 3 insertions(+) (limited to 'lib/Target/ARM') diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 711321c6b6..48cad6173b 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/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); } -- cgit v1.2.3-70-g09d2