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Codegen support for the llvm.invariant/lifetime.start/end intrinsics: 

just throw them away.

llvm-svn: 86678
This commit is contained in:
Duncan Sands 2009-11-10 09:08:09 +00:00
parent f9667229a1
commit dca0c28452
2 changed files with 19 additions and 0 deletions
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9
llvm/lib/CodeGen/IntrinsicLowering.cpp
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@ -515,6 +515,15 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
if (CI->getType() != Type::getVoidTy(Context)) if (CI->getType() != Type::getVoidTy(Context))
CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1)); CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
break; break;
case Intrinsic::invariant_start:
case Intrinsic::lifetime_start:
// Discard region information.
CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
break;
case Intrinsic::invariant_end:
case Intrinsic::lifetime_end:
// Discard region information.
break;
} }
assert(CI->use_empty() && assert(CI->use_empty() &&

10
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
View File

@ -4409,6 +4409,16 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_UMAX); return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_UMAX);
case Intrinsic::atomic_swap: case Intrinsic::atomic_swap:
return implVisitBinaryAtomic(I, ISD::ATOMIC_SWAP); return implVisitBinaryAtomic(I, ISD::ATOMIC_SWAP);
case Intrinsic::invariant_start:
case Intrinsic::lifetime_start:
// Discard region information.
setValue(&I, DAG.getUNDEF(TLI.getPointerTy()));
return 0;
case Intrinsic::invariant_end:
case Intrinsic::lifetime_end:
// Discard region information.
return 0;
} }
} }