Introduce "expect" intrinsic instructions.

llvm-svn: 134516

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/IntrinsicLowering.cpp b/llvm/lib/CodeGen/IntrinsicLowering.cpp
index 3861ddadf65..b0a823042d4 100644
--- a/llvm/lib/CodeGen/IntrinsicLowering.cpp
+++ b/llvm/lib/CodeGen/IntrinsicLowering.cpp
@@ -353,6 +353,13 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
     report_fatal_error("Code generator does not support intrinsic function '"+
                       Callee->getName()+"'!");
 
+  case Intrinsic::expect: {
+    // Just replace __builtin_expect(exp, c) with EXP.
+    Value *V = CI->getArgOperand(0);
+    CI->replaceAllUsesWith(V);
+    break;
+  }
+
     // The setjmp/longjmp intrinsics should only exist in the code if it was
     // never optimized (ie, right out of the CFE), or if it has been hacked on
     // by the lowerinvoke pass.  In both cases, the right thing to do is to