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For now, avoid issuing extract_subreg to reuse lower 8-bit, it's not safe in 32-bit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93307 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-01-13 08:01:32 +00:00
parent d89d5180d1
commit 57d1d936fc
1 changed files with 4 additions and 0 deletions
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4
lib/Target/X86/X86InstrInfo.cpp
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@ -724,6 +724,10 @@ X86InstrInfo::isCoalescableExtInstr(const MachineInstr &MI,
case X86::MOVZX32rr8:
case X86::MOVSX64rr8:
case X86::MOVZX64rr8:
if (!TM.getSubtarget<X86Subtarget>().is64Bit())
// It's not always legal to reference the low 8-bit of the larger
// register in 32-bit mode.
return false;
case X86::MOVSX32rr16:
case X86::MOVZX32rr16:
case X86::MOVSX64rr16: