diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 23 |
1 files changed, 0 insertions, 23 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 9954b6c63ce..fae877ab222 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -2951,20 +2951,6 @@ static SDValue getMOVL(SelectionDAG &DAG, SDLoc dl, EVT VT, SDValue V1, return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]); } -/// Check if the fall through instruction after a call site is unreachable. -/// FIXME: This will fail if there are interesting non-code generating IR -/// instructions between the call and the unreachable (lifetime.end). In -/// practice, this should be rare because optimizations like to delete non-call -/// code before unreachable. -static bool isCallFollowedByUnreachable(ImmutableCallSite CS) { - const Instruction *NextInst; - if (auto *II = dyn_cast<InvokeInst>(CS.getInstruction())) - NextInst = II->getNormalDest()->getFirstNonPHIOrDbg(); - else - NextInst = CS.getInstruction()->getNextNode(); - return isa<UnreachableInst>(NextInst); -} - SDValue X86TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, SmallVectorImpl<SDValue> &InVals) const { @@ -3470,15 +3456,6 @@ X86TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, InFlag = Chain.getValue(1); } - if (Subtarget->isTargetWin64() && CLI.CS) { - // Look for a call followed by unreachable. On Win64, we need to ensure that - // the call does not accidentally fall through to something that looks like - // an epilogue. We do this by inserting a DEBUGTRAP, which lowers to int3, - // which is what MSVC emits after noreturn calls. - if (isCallFollowedByUnreachable(*CLI.CS)) - Chain = DAG.getNode(ISD::DEBUGTRAP, dl, MVT::Other, Chain); - } - // Handle result values, copying them out of physregs into vregs that we // return. return LowerCallResult(Chain, InFlag, CallConv, isVarArg, |
