Add option -enable-x86-lsr to enable x86 loop strength reduction pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26665 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 8adce31..de7004d 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -37,6 +37,10 @@
cl::opt<bool> DisableOutput("disable-x86-llc-output", cl::Hidden,
cl::desc("Disable the X86 asm printer, for use "
"when profiling the code generator."));
+
+ cl::opt<bool> EnableX86LSR("enable-x86-lsr", cl::Hidden,
+ cl::desc("Enable the X86 loop strength reduction "
+ "pass."));
// Register the target.
RegisterTarget<X86TargetMachine> X("x86", " IA-32 (Pentium and above)");
}
@@ -92,6 +96,9 @@
if (FileType != TargetMachine::AssemblyFile &&
FileType != TargetMachine::ObjectFile) return true;
+ // Run loop strength reduction before anything else.
+ if (EnableX86LSR) PM.add(createLoopStrengthReducePass());
+
// FIXME: Implement efficient support for garbage collection intrinsics.
PM.add(createLowerGCPass());