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add a new @llvm.donothing intrinsic that, well, does nothing, and teach CodeGen to ignore calls to it

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159383 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-06-28 22:30:12 +00:00
parent 926dc168c8
commit 85b408991a
3 changed files with 42 additions and 1 deletions
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9
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@@ -1828,9 +1828,13 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
const Value *Callee(I.getCalledValue());
const Function *Fn = dyn_cast<Function>(Callee);
if (isa<InlineAsm>(Callee))
visitInlineAsm(&I);
else
else if (Fn && Fn->isIntrinsic()) {
assert(Fn->getIntrinsicID() == Intrinsic::donothing);
return; // ignore invokes to @llvm.donothing
} else
LowerCallTo(&I, getValue(Callee), false, LandingPad);
// If the value of the invoke is used outside of its defining block, make it
@@ -5178,6 +5182,9 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
case Intrinsic::lifetime_end:
// Discard region information.
return 0;
case Intrinsic::donothing:
// ignore
return 0;
}
}