The early if conversion pass is ready to be used as an opt-in.
Enable the pass by default for targets that request it, and change the
-enable-early-ifcvt to the opposite -disable-early-ifcvt.
There are still some x86 regressions when enabling early if-conversion
because of the missing machine models. Disable the pass for x86 until
machine models are added.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165075 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index b7ba568..b05b31b 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -113,6 +113,12 @@
cl::desc("Minimize AVX to SSE transition penalty"),
cl::init(true));
+// Temporary option to control early if-conversion for x86 while adding machine
+// models.
+static cl::opt<bool>
+X86EarlyIfConv("x86-early-ifcvt",
+ cl::desc("Enable early if-conversion on X86"));
+
//===----------------------------------------------------------------------===//
// Pass Pipeline Configuration
//===----------------------------------------------------------------------===//
@@ -142,7 +148,7 @@
TargetPassConfig *X86TargetMachine::createPassConfig(PassManagerBase &PM) {
X86PassConfig *PC = new X86PassConfig(this, PM);
- if (Subtarget.hasCMov())
+ if (X86EarlyIfConv && Subtarget.hasCMov())
PC->enablePass(&EarlyIfConverterID);
return PC;