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Create a stack slot for the return address lazily instead of eagerly. This
save small amounts of time for functions that don't call llvm.returnaddress or llvm.frameaddress (which is almost all functions). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19006 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -96,6 +96,9 @@ namespace {
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/// the entire function.
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///
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bool runOnFunction(Function &Fn) {
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// Lazily create a stack slot for the return address if needed.
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ReturnAddressIndex = -1;
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// First pass over the function, lower any unknown intrinsic functions
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// with the IntrinsicLowering class.
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LowerUnknownIntrinsicFunctionCalls(Fn);
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@ -108,10 +111,6 @@ namespace {
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BB = &F->front();
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// Set up a frame object for the return address. This is used by the
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// llvm.returnaddress & llvm.frameaddress intrinisics.
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ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
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// Copy incoming arguments off of the stack...
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LoadArgumentsToVirtualRegs(Fn);
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@ -1765,6 +1764,11 @@ void X86ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
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case Intrinsic::frameaddress:
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TmpReg1 = getReg(CI);
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if (cast<Constant>(CI.getOperand(1))->isNullValue()) {
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if (ReturnAddressIndex == -1) {
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// Set up a frame object for the return address.
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ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
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}
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if (ID == Intrinsic::returnaddress) {
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// Just load the return address
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addFrameReference(BuildMI(BB, X86::MOV32rm, 4, TmpReg1),
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