Merging r343428:

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r343428 | ctopper | 2018-09-30 16:43:30 -0700 (Sun, 30 Sep 2018) | 3 lines

[X86] Change an llvm_unreachable to a report_fatal_error so the optimizer will stop making us reach the other report_fatal_error in this function.

There's a conditional report_fatal_error just above this llvm_unreachable. The optimizer when seeing the unreachable removes the conditional and just makes any other error trigger the existing report_fatal_error.
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llvm-svn: 344805

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 96db8b4e758..e5645236216 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -3109,7 +3109,7 @@ void X86InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
 
   LLVM_DEBUG(dbgs() << "Cannot copy " << RI.getName(SrcReg) << " to "
                     << RI.getName(DestReg) << '\n');
-  llvm_unreachable("Cannot emit physreg copy instruction");
+  report_fatal_error("Cannot emit physreg copy instruction");
 }
 
 bool X86InstrInfo::isCopyInstr(const MachineInstr &MI,