[PATCH] D24953: [X86][FastISel] Use a COPY from K register to a GPR instead of a K operation

Guy Blank via llvm-commits llvm-commits at lists.llvm.org
Mon Sep 26 23:48:43 PDT 2016


guyblank created this revision.
guyblank added reviewers: delena, igorb, craig.topper, zvi.
guyblank added a subscriber: llvm-commits.

The KORTEST was introduced due to a bug where a TEST instruction used a K register.
but, turns out that the opposite case of KORTEST using a GPR is now happening (as seen in several bug reports, [[ https://llvm.org/bugs/show_bug.cgi?id=30502 | for example ]])

The change removes the KORTEST flow and adds a COPY instruction from the K reg to a GPR.

https://reviews.llvm.org/D24953

Files:
  lib/Target/X86/X86FastISel.cpp
  test/CodeGen/X86/avx512-fsel.ll
  test/CodeGen/X86/fast-isel-select-cmov.ll

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