Add support for a pattern matching instruction selector. This is still in
the early implementation phases, so it is disabled by default
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7719 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 893e62f..2de30f7 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -20,6 +20,8 @@
cl::desc("Use Simple RA instead of Local RegAlloc"));
cl::opt<bool> PrintCode("print-machineinstrs",
cl::desc("Print generated machine code"));
+ cl::opt<bool> NoPatternISel("disable-pattern-isel", cl::init(true),
+ cl::desc("Use the 'simple' X86 instruction selector"));
}
// allocateX86TargetMachine - Allocate and return a subclass of TargetMachine
@@ -59,7 +61,10 @@
// FIXME: Implement the switch instruction in the instruction selector!
PM.add(createLowerSwitchPass());
- PM.add(createX86SimpleInstructionSelector(*this));
+ if (NoPatternISel)
+ PM.add(createX86SimpleInstructionSelector(*this));
+ else
+ PM.add(createX86PatternInstructionSelector(*this));
// TODO: optional optimizations go here