Disable the PPC CTR-Loops pass by default.
The pass itself works well, but the something in the Machine* infrastructure
does not understand terminators which define registers. Without the ability
to use the block-placement pass, etc. this causes performance regressions (and
so is turned off by default). Turning off the analysis turns off the problems
with the Machine* infrastructure.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158206 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index 6f7fc4b..bcab83c 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -23,8 +23,8 @@
using namespace llvm;
static cl::
-opt<bool> DisableCTRLoops("disable-ppc-ctrloops", cl::Hidden,
- cl::desc("Disable CTR loops for PPC"));
+opt<bool> EnableCTRLoops("enable-ppc-ctrloops", cl::Hidden,
+ cl::desc("Enable CTR loops for PPC"));
extern "C" void LLVMInitializePowerPCTarget() {
// Register the targets
@@ -103,9 +103,10 @@
}
bool PPCPassConfig::addPreRegAlloc() {
- if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None) {
+ // FIXME: Once this can be enabled by default, this condition should read:
+ // if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
+ if (EnableCTRLoops)
PM->add(createPPCCTRLoops());
- }
return false;
}