diff options
| -rw-r--r-- | lib/Target/X86/X86ISelSimple.cpp | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp index ed93101ecb..2d77f7e1fc 100644 --- a/lib/Target/X86/X86ISelSimple.cpp +++ b/lib/Target/X86/X86ISelSimple.cpp @@ -96,6 +96,9 @@ namespace { /// the entire function. /// bool runOnFunction(Function &Fn) { + // Lazily create a stack slot for the return address if needed. + ReturnAddressIndex = -1; + // First pass over the function, lower any unknown intrinsic functions // with the IntrinsicLowering class. LowerUnknownIntrinsicFunctionCalls(Fn); @@ -108,10 +111,6 @@ namespace { BB = &F->front(); - // Set up a frame object for the return address. This is used by the - // llvm.returnaddress & llvm.frameaddress intrinisics. - ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4); - // Copy incoming arguments off of the stack... LoadArgumentsToVirtualRegs(Fn); @@ -1765,6 +1764,11 @@ void X86ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) { case Intrinsic::frameaddress: TmpReg1 = getReg(CI); if (cast<Constant>(CI.getOperand(1))->isNullValue()) { + if (ReturnAddressIndex == -1) { + // Set up a frame object for the return address. + ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4); + } + if (ID == Intrinsic::returnaddress) { // Just load the return address addFrameReference(BuildMI(BB, X86::MOV32rm, 4, TmpReg1), |