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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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8
lib/Target/PowerPC/PPCTargetMachine.cpp
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@ -23,8 +23,8 @@
using namespace llvm;
static cl::
opt<bool> EnableCTRLoops("enable-ppc-ctrloops", cl::Hidden,
cl::desc("Enable CTR loops for PPC"));
opt<bool> DisableCTRLoops("disable-ppc-ctrloops", cl::Hidden,
cl::desc("Disable CTR loops for PPC"));
extern "C" void LLVMInitializePowerPCTarget() {
// Register the targets
@ -103,9 +103,7 @@ TargetPassConfig *PPCTargetMachine::createPassConfig(PassManagerBase &PM) {
}
bool PPCPassConfig::addPreRegAlloc() {
// FIXME: Once this can be enabled by default, this condition should read:
// if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
if (EnableCTRLoops)
if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
PM->add(createPPCCTRLoops());
return false;