[all-commits] [llvm/llvm-project] f912ba: Revert "[X86][DAGISel] Don't widen shuffle element...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f912bab111add1275fcaf5f24e4d3654127972d0
      https://github.com/llvm/llvm-project/commit/f912bab111add1275fcaf5f24e4d3654127972d0
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-07-28 (Thu, 28 Jul 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512-shuffles/shuffle-blend.ll
    M llvm/test/CodeGen/X86/combine-sdiv.ll

  Log Message:
  -----------
  Revert "[X86][DAGISel] Don't widen shuffle element with AVX512"

This reverts commit 5fb41342105700949c81f68aefc85d9c46e9a1a6.

This patch is causing crashes when building llvm-test-suite when
optimizing for CPUs with AVX512.

Reproducer crashing with llc:

    target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
    target triple = "x86_64-apple-macosx"

    define i32 @test(<32 x i32> %0) #0 {
    entry:
      %1 = mul <32 x i32> %0, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
      %2 = tail call i32 @llvm.vector.reduce.add.v32i32(<32 x i32> %1)
      ret i32 %2
    }

    ; Function Attrs: nocallback nofree nosync nounwind readnone willreturn
    declare i32 @llvm.vector.reduce.add.v32i32(<32 x i32>) #1

    attributes #0 = { "min-legal-vector-width"="0" "target-cpu"="skylake-avx512" }
    attributes #1 = { nocallback nofree nosync nounwind readnone willreturn }