Do not replace operands of pseudo instructions with register $zero.
llvm-svn: 156663
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@ -213,7 +213,8 @@ bool MipsDAGToDAGISel::ReplaceUsesWithZeroReg(MachineRegisterInfo *MRI,
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MachineInstr *MI = MO.getParent();
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MachineInstr *MI = MO.getParent();
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// Do not replace if it is a phi's operand or is tied to def operand.
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// Do not replace if it is a phi's operand or is tied to def operand.
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if (MI->isPHI() || MI->isRegTiedToDefOperand(U.getOperandNo()))
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if (MI->isPHI() || MI->isRegTiedToDefOperand(U.getOperandNo()) ||
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MI->isPseudo())
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continue;
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continue;
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MO.setReg(ZeroReg);
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MO.setReg(ZeroReg);
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@ -242,3 +242,19 @@ entry:
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; CHECK: sync 0
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; CHECK: sync 0
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}
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}
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; make sure that this assertion in
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; TwoAddressInstructionPass::TryInstructionTransform does not fail:
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;
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; line 1203: assert(TargetRegisterInfo::isVirtualRegister(regB) &&
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;
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; it failed when MipsDAGToDAGISel::ReplaceUsesWithZeroReg replaced an
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; operand of an atomic instruction with register $zero.
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@a = external global i32
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define i32 @zeroreg() nounwind {
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entry:
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%0 = cmpxchg i32* @a, i32 1, i32 0 seq_cst
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%1 = icmp eq i32 %0, 1
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%conv = zext i1 %1 to i32
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ret i32 %conv
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}
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