Introduce "expect" intrinsic instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134516 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/IntrinsicLowering.cpp b/lib/CodeGen/IntrinsicLowering.cpp
index 3861dda..b0a8230 100644
--- a/lib/CodeGen/IntrinsicLowering.cpp
+++ b/lib/CodeGen/IntrinsicLowering.cpp
@@ -353,6 +353,13 @@
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
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index ea59ca1..fc8f0d2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4771,6 +4771,13 @@
case Intrinsic::flt_rounds:
setValue(&I, DAG.getNode(ISD::FLT_ROUNDS_, dl, MVT::i32));
return 0;
+
+ case Intrinsic::expect: {
+ // Just replace __builtin_expect(exp, c) with EXP.
+ setValue(&I, getValue(I.getArgOperand(0)));
+ return 0;
+ }
+
case Intrinsic::trap: {
StringRef TrapFuncName = getTrapFunctionName();
if (TrapFuncName.empty()) {