[PATCH] D40497: [PowerPC] Partially enable the ISEL expansion pass.

Mon Nov 27 08:29:10 PST 2017

jtony created this revision.
Herald added subscribers: kbarton, nemanjai.

The pass to expand ISEL instructions into if-then-else sequences in patch https://reviews.llvm.org/D23630 is currently disabled. This patch partially enable it by always removing the unnecessary ISELs (all registers used by the ISELs are the same one) and folding the ISELs which have the same input registers into unconditional copies.

https://reviews.llvm.org/D40497

Files:
  lib/Target/PowerPC/PPCExpandISEL.cpp
  test/CodeGen/PowerPC/expand-contiguous-isel.ll
  test/CodeGen/PowerPC/expand-isel-9.mir

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