[all-commits] [llvm/llvm-project] b3913a: [GlobalISel] Do not crash on widening vector result

[Serge Pavlov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b3913a9cdf49102589e7dd31ff979bfaf958a720
      https://github.com/llvm/llvm-project/commit/b3913a9cdf49102589e7dd31ff979bfaf958a720
  Author: Serge Pavlov <sepavloff at gmail.com>
  Date:   2022-09-30 (Fri, 30 Sep 2022)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
    M llvm/test/CodeGen/X86/GlobalISel/x86_64-irtranslator.ll

  Log Message:
  -----------
  [GlobalISel] Do not crash on widening vector result

Function buildCopyToRegs did not handle properly the case when it should
make wider vector result. It happened, for example, in a function that
returns value of type <2 x f32>, which should be widen to <4 x f32> to
fit XMM register. The function eventually calls
MachineIRBuilder.buildUnmerge, which does not expect that only one
destination register is specified.

Now this case is treated specifically in buildCopyToRegs.

Differential Revision: https://reviews.llvm.org/D128546