[PATCH] D42287: [GlobalISel][X86] Fixing failures after https://reviews.llvm.org/D37775

[Alexander Ivchenko via Phabricator via llvm-commits]

aivchenk marked 6 inline comments as done.
aivchenk added inline comments.


================
Comment at: lib/Target/X86/X86LegalizerInfo.cpp:169
+  // s128 = EXTEND (G_IMPLICIT_DEF s32/s64) -> s128 = G_IMPLICIT_DEF
+  setAction({G_IMPLICIT_DEF, s128}, Legal);
 
----------------
qcolombet wrote:
> When is this pattern created?

It can be seen in regbankselect-X86_64.mir:

  define float @test_undef3() {
    ret float undef
  }

before legalizer:

    %1(s128) = G_IMPLICIT_DEF
    %xmm0 = COPY %1(s128)
    RET 0, implicit %xmm0

after legalizer:

    %1:_(s128) = G_IMPLICIT_DEF
    %xmm0 = COPY %1(s128)
    RET 0, implicit %xmm0




https://reviews.llvm.org/D42287