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Disable PPC comparison optimization by default

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This seems to cause a stage-2 LLVM compile failure (by crashing TableGen); do
I'm disabling this for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179807 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-04-18 22:54:25 +00:00
parent 88eb89b89f
commit 4029c3feed
2 changed files with 7 additions and 1 deletions
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6
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -42,6 +42,9 @@ static cl::
opt<bool> DisableCTRLoopAnal("disable-ppc-ctrloop-analysis", cl::Hidden,
cl::desc("Disable analysis for CTR loops"));
static cl::opt<bool> DisableCmpOpt("disable-ppc-cmp-opt", cl::init(true),
cl::desc("Disable compare instruction optimization"), cl::Hidden);
PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
: PPCGenInstrInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
TM(tm), RI(*TM.getSubtargetImpl(), *this) {}
@ -1088,6 +1091,9 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr *CmpInstr,
unsigned SrcReg, unsigned SrcReg2,
int Mask, int Value,
const MachineRegisterInfo *MRI) const {
if (DisableCmpOpt)
return false;
int OpC = CmpInstr->getOpcode();
unsigned CRReg = CmpInstr->getOperand(0).getReg();
bool isFP = OpC == PPC::FCMPUS || OpC == PPC::FCMPUD;

2
test/CodeGen/PowerPC/optcmp.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 | FileCheck %s
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 -disable-ppc-cmp-opt=0 | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"