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For now, avoid issuing extract_subreg to reuse lower 8-bit, it's not safe in 32-bit.
llvm-svn: 93307
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@ -724,6 +724,10 @@ X86InstrInfo::isCoalescableExtInstr(const MachineInstr &MI,
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case X86::MOVZX32rr8:
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case X86::MOVSX64rr8:
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case X86::MOVZX64rr8:
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if (!TM.getSubtarget<X86Subtarget>().is64Bit())
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// It's not always legal to reference the low 8-bit of the larger
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// register in 32-bit mode.
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return false;
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case X86::MOVSX32rr16:
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case X86::MOVZX32rr16:
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case X86::MOVSX64rr16:
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