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| author | Evan Cheng <evan.cheng@apple.com> | 2010-01-13 08:01:32 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-01-13 08:01:32 +0000 |
| commit | 57d1d936fc41c3482047c9d18dbaa27625df5768 (patch) | |
| tree | a93b251c09d7c5e0b209d83584481222e47f1507 | |
| parent | d89d5180d12107a2cdffa179c213370db2e088d5 (diff) | |
For now, avoid issuing extract_subreg to reuse lower 8-bit, it's not safe in 32-bit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93307 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index a1bacbf0e6..7b39fb311c 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -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: |