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Somehow I lost a condition when I was shuffling some code around. Anyway,
only transform a shufps to pshufd when the first two operands are the same. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28575 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -125,11 +125,11 @@ MachineInstr *X86InstrInfo::convertToThreeAddress(MachineInstr *MI) const {
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case X86::SHUFPSrri: {
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assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
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const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
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if (!Subtarget->hasSSE2()) return 0;
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unsigned A = MI->getOperand(0).getReg();
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unsigned B = MI->getOperand(1).getReg();
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unsigned C = MI->getOperand(2).getReg();
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unsigned M = MI->getOperand(3).getImmedValue();
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if (!Subtarget->hasSSE2() || B != C) return 0;
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return BuildMI(X86::PSHUFDri, 2, A).addReg(B).addImm(M);
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}
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}
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