[llvm-bugs] [Bug 43866] New: [X86] Cannot select v4f64 = vector_shuffle

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43866

            Bug ID: 43866
           Summary: [X86] Cannot select v4f64 = vector_shuffle
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: Wolfgang_Pieb at playstation.sony.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

The attached IR causes an ICE when compiled with the latest llc for an X86
target:

$ llc test.ll
LLVM ERROR: Cannot select: t53: v4f64 = vector_shuffle<0,1,0,1> t51,
undef:v4f64
  t51: v4f64 = bitcast t72
    t72: v8i32 = BUILD_VECTOR undef:i32, Constant:i32<-1>, undef:i32,
undef:i32, undef:i32, undef:i32, undef:i32, undef:i32
      t9: i32 = undef
      t5: i32 = Constant<-1>
      t9: i32 = undef
      t9: i32 = undef
      t9: i32 = undef
      t9: i32 = undef
      t9: i32 = undef
      t9: i32 = undef
  t52: v4f64 = undef
In function: test

It seems it's caused by
==============================================
commit 30837abd9623bf2c8582627d2179828ecf361965
Author: Craig Topper <craig.topper at intel.com>
Date:   Sun Sep 8 19:24:29 2019 +0000

    [X86] Teach materializeVectorConstant to not call
getZeroVector/getOnesVector on the types we already have isel patterns for.

    llvm-svn: 371343
==============================================
The .ll file was generated (and then hand-reduced) with

clang version 10.0.0 (git at github.com:llvm/llvm-project.git 30837abd9623b...)
from the following C source:

typedef unsigned __attribute__((ext_vector_type(2))) uint2;
typedef unsigned __attribute__((ext_vector_type(8))) uint8;

uint2 v2_0;
void test()
{
      uint2 v2_1 = {1, 1};
      uint2 v2_2 = (uint2)(v2_0 || v2_1);
      volatile uint8 v8_0 = __builtin_shufflevector(v2_0, v2_2, 1, 3, 0, 0, 3,
3, 2, 2);
}

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