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Enable PPC CTR loop formation by default.

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Thanks to Jakob's help, this now causes no new test suite failures!

Over the entire test suite, this gives an average 1% speedup. The largest speedups are:
SingleSource/Benchmarks/Misc/pi - 108%
SingleSource/Benchmarks/CoyoteBench/lpbench - 54%
MultiSource/Benchmarks/Prolangs-C/unix-smail/unix-smail - 50%
SingleSource/Benchmarks/Shootout/ary3 - 32%
SingleSource/Benchmarks/Shootout-C++/matrix - 30%

The largest slowdowns are:
MultiSource/Benchmarks/mediabench/gsm/toast/toast - -30%
MultiSource/Benchmarks/Prolangs-C/bison/mybison - -25%
MultiSource/Benchmarks/BitBench/uuencode/uuencode - -22%
MultiSource/Applications/d/make_dparser - -14%
SingleSource/Benchmarks/Shootout-C++/ary - -13%

In light of these slowdowns, additional profiling work is obviously needed!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2012-06-08 19:19:53 +00:00
parent 7e5631202a
commit 7255d2a808
4 changed files with 11 additions and 13 deletions
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12
lib/Target/PowerPC/PPCInstrInfo.cpp
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@ -41,8 +41,8 @@ extern cl::opt<bool> DisablePPC64RS;
using namespace llvm;
static cl::
opt<bool> EnableCTRLoopAnal("enable-ppc-ctrloop-analysis", cl::Hidden,
cl::desc("Enable analysis for CTR loops (experimental)"));
opt<bool> DisableCTRLoopAnal("disable-ppc-ctrloop-analysis", cl::Hidden,
cl::desc("Disable analysis for CTR loops"));
PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
: PPCGenInstrInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
@ -233,7 +233,7 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
LastInst->getOpcode() == PPC::BDNZ) {
if (!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
if (DisableCTRLoopAnal)
return true;
TBB = LastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(1));
@ -244,7 +244,7 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
LastInst->getOpcode() == PPC::BDZ) {
if (!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
if (DisableCTRLoopAnal)
return true;
TBB = LastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(0));
@ -282,7 +282,7 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
if (!SecondLastInst->getOperand(0).isMBB() ||
!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
if (DisableCTRLoopAnal)
return true;
TBB = SecondLastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(1));
@ -296,7 +296,7 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
if (!SecondLastInst->getOperand(0).isMBB() ||
!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
if (DisableCTRLoopAnal)
return true;
TBB = SecondLastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(0));