diff options
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 3 | ||||
| -rw-r--r-- | test/CodeGen/X86/crash.ll | 11 |
2 files changed, 14 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index c1d66cb570..91cec98946 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -1913,6 +1913,9 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB, else if (SrcRC->hasSuperClass(&X86::GR32RegClass) && DestRC->hasSuperClass(&X86::GR32RegClass)) CommonRC = &X86::GR32RegClass; + else if (SrcRC->hasSuperClass(&X86::GR8RegClass) && + DestRC->hasSuperClass(&X86::GR8RegClass)) + CommonRC = &X86::GR8RegClass; else CommonRC = 0; } diff --git a/test/CodeGen/X86/crash.ll b/test/CodeGen/X86/crash.ll index 2f27f35f0a..a14a48baa3 100644 --- a/test/CodeGen/X86/crash.ll +++ b/test/CodeGen/X86/crash.ll @@ -130,3 +130,14 @@ bb14: bb67: ret void } + +; Crash when trying to copy AH to AL. +; PR7540 +define void @copy8bitregs() nounwind { +entry: + %div.i = sdiv i32 115200, 0 + %shr8.i = lshr i32 %div.i, 8 + %conv4.i = trunc i32 %shr8.i to i8 + call void asm sideeffect "outb $0, ${1:w}", "{ax},N{dx},~{dirflag},~{fpsr},~{flags}"(i8 %conv4.i, i32 1017) nounwind + unreachable +} |