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Fix the problems with callee popped argument lists
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21988 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3746,7 +3746,43 @@ void ISel::Select(SDOperand N) {
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// Amount the callee added to the stack pointer.
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Tmp2 = cast<ConstantSDNode>(N.getOperand(2))->getValue();
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BuildMI(BB, X86::ADJCALLSTACKUP, 2).addImm(Tmp1).addImm(Tmp2);
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// This hackery is due to the fact that we don't want to emit this code:
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// call foo
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// mov vreg, EAX
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// adjcallstackup
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//
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// Because if foo is a fastcc call and if vreg gets spilled, we might end up
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// with this:
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// call foo
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// mov [ESP+offset], EAX ;; Offset doesn't consider the 12!
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// sub ESP, 12
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//
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// To avoid this, we force the adjcallstackup instruction before the 0, 1 or
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// 2 moves that occur after the call. The correct way to fix this is to use
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// target-specific DAG nodes in the call sequence. FIXME!
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//
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if (EnableFastCC) {
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// This code should be safe. Be defensive for LLVM 1.5 release though.
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assert(!BB->empty());
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MachineBasicBlock::iterator PrevI = --BB->end();
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if (PrevI->getOpcode() == X86::CALLpcrel32 ||
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PrevI->getOpcode() == X86::CALL32r)
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++PrevI;
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else if (PrevI != BB->begin() &&
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((--PrevI)->getOpcode() == X86::CALLpcrel32 ||
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PrevI->getOpcode() == X86::CALL32r))
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++PrevI;
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else if (PrevI != BB->begin() &&
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((--PrevI)->getOpcode() == X86::CALLpcrel32 ||
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PrevI->getOpcode() == X86::CALL32r))
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++PrevI;
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else
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PrevI = BB->end();
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BuildMI(*BB, PrevI, X86::ADJCALLSTACKUP, 2).addImm(Tmp1).addImm(Tmp2);
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} else {
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BuildMI(*BB, PrevI, X86::ADJCALLSTACKUP, 2).addImm(Tmp1).addImm(Tmp2);
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}
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return;
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case ISD::MEMSET: {
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Select(N.getOperand(0)); // Select the chain.
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