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add a new @llvm.donothing intrinsic that, well, does nothing, and teach CodeGen to ignore calls to it
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159383 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -412,6 +412,9 @@ def int_trap : Intrinsic<[], [], [IntrNoReturn]>,
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def int_debugtrap : Intrinsic<[]>,
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GCCBuiltin<"__builtin_debugtrap">;
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// NOP: calls/invokes to this intrinsic are removed by codegen
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def int_donothing : Intrinsic<[], [], [IntrNoMem]>;
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// Intrisics to support half precision floating point format
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let Properties = [IntrNoMem] in {
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def int_convert_to_fp16 : Intrinsic<[llvm_i16_ty], [llvm_float_ty]>,
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@ -1828,9 +1828,13 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
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MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
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const Value *Callee(I.getCalledValue());
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const Function *Fn = dyn_cast<Function>(Callee);
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if (isa<InlineAsm>(Callee))
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visitInlineAsm(&I);
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else
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else if (Fn && Fn->isIntrinsic()) {
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assert(Fn->getIntrinsicID() == Intrinsic::donothing);
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return; // ignore invokes to @llvm.donothing
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} else
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LowerCallTo(&I, getValue(Callee), false, LandingPad);
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// If the value of the invoke is used outside of its defining block, make it
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@ -5178,6 +5182,9 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
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case Intrinsic::lifetime_end:
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// Discard region information.
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return 0;
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case Intrinsic::donothing:
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// ignore
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return 0;
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}
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}
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31
test/CodeGen/Generic/donothing.ll
Normal file
31
test/CodeGen/Generic/donothing.ll
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@ -0,0 +1,31 @@
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; RUN: llc < %s | FileCheck %s
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declare i32 @__gxx_personality_v0(...)
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declare void @__cxa_call_unexpected(i8*)
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declare void @llvm.donothing() readnone
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; CHECK: f1
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define void @f1() nounwind uwtable ssp {
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entry:
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; CHECK-NOT donothing
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invoke void @llvm.donothing()
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to label %invoke.cont unwind label %lpad
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invoke.cont:
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ret void
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lpad:
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%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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filter [0 x i8*] zeroinitializer
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%1 = extractvalue { i8*, i32 } %0, 0
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tail call void @__cxa_call_unexpected(i8* %1) noreturn nounwind
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unreachable
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}
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; CHECK: f2
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define void @f2() nounwind {
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entry:
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; CHECK-NOT donothing
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call void @llvm.donothing()
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ret void
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}
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