Enable PPC CTR loop formation by default.
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
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index bcab83c..b9c703e 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -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 @@
}
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;