[llvm-bugs] [Bug 36199] New: [SKX] fatal error: error in backend: "LLVM ERROR: Cannot select 0x*: v8f32 = bitcast 0x*"

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https://bugs.llvm.org/show_bug.cgi?id=36199

            Bug ID: 36199
           Summary: [SKX] fatal error: error in backend: "LLVM ERROR:
                    Cannot select 0x*: v8f32 = bitcast 0x*"
           Product: new-bugs
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ilia.taraban at intel.com
                CC: llvm-bugs at lists.llvm.org

This test fails with "LLVM ERROR: Cannot select: 0x23f5068: v8f32 = bitcast
0x23f4848" in backend:

================= nice.ll ==============

define void @foo() unnamed_addr #0 {
  %1 = fadd <16 x float> undef, undef
  %bc256 = bitcast <16 x float> %1 to <4 x i128>
  %2 = extractelement <4 x i128> %bc256, i32 0
  %3 = bitcast i128 %2 to <4 x float>
  %4 = shufflevector <4 x float> %3, <4 x float> undef, <16 x i32> <i32 0, i32
1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3, i32 0,
i32 1, i32 2, i32 3>
  store <16 x float> %4, <16 x float>* undef, align 4
  ret void
}

attributes #0 = { nounwind uwtable "target-cpu"="skylake-avx512"}

=======================================

>>> clang -v
clang version 7.0.0 (trunk 323949)
Target: x86_64-unknown-linux-gnu
Thread model: posix
...


>>> llc nice.ll
LLVM ERROR: Cannot select: 0x36f84a8: v8f32 = bitcast 0x36f7c88
  0x36f7c88: v16f32 = fadd undef:v16f32, undef:v16f32
    0x36f7c20: v16f32 = undef
    0x36f7c20: v16f32 = undef
In function: foo

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