[all-commits] [llvm/llvm-project] d2b6ac: Revert "[X86] Use X86ISD::SUB instead of X86ISD::C...

[kadir çetinkaya via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d2b6ac6ccda5ad8e38eee38e7ee46acad03540be
      https://github.com/llvm/llvm-project/commit/d2b6ac6ccda5ad8e38eee38e7ee46acad03540be
  Author: Kadir Cetinkaya <kadircet at google.com>
  Date:   2020-02-04 (Tue, 04 Feb 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  Revert "[X86] Use X86ISD::SUB instead of X86ISD::CMP in some places."

This reverts commit 8413116bf10402eef12f556cb9d80b08faeb9890.

this seems to be causing crashes while compiling ncurses.
```
$ ./bin/llc bugpoint-reduced-simplified.ll
LLVM ERROR: Cannot emit physreg copy instruction
```

Here are the crashers: https://gist.github.com/kadircet/918f5bb97a2afe048cb875490edba46e

executing with an llc compiled at 904d54de9ba9f71e937b24e04ad5941281cd50b7 works fine.