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
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index a1bacbf..7b39fb3 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -724,6 +724,10 @@
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: