[llvm-bugs] [Bug 30663] New: Crash in PowerPC MI Peephole Optimization

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30663

            Bug ID: 30663
           Summary: Crash in PowerPC MI Peephole Optimization
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: timshen91 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

llc -O1 crashes on the following reduced testcase:

target triple = "powerpc64le-linux-gnu"

; a.ll begins
define void @Test() {
bb4:
  %tmp = load <4 x i8>, <4 x i8>* undef
  %tmp8 = bitcast <4 x i8> %tmp to float
  %tmp18 = fmul float %tmp8, undef
  %tmp19 = fsub float 0.000000e+00, %tmp18
  store float %tmp19, float* undef
  %tmp22 = shufflevector <4 x i8> %tmp, <4 x i8> 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>
  %tmp23 = bitcast <16 x i8> %tmp22 to <4 x float>
  %tmp25 = tail call <4 x float> @llvm.fma.v4f32(<4 x float> undef, <4 x float>
%tmp23, <4 x float> undef)
  %tmp26 = fsub <4 x float> zeroinitializer, %tmp25
  %tmp27 = bitcast <4 x float> %tmp26 to <4 x i32>
  tail call void @llvm.ppc.altivec.stvx(<4 x i32> %tmp27, i8* undef)
  ret void
}

declare void @llvm.ppc.altivec.stvx(<4 x i32>, i8*)
declare <4 x float> @llvm.fma.v4f32(<4 x float>, <4 x float>, <4 x float>)
; a.ll ends


I ran -verify-machineinstrs and saw PowerPC MI Peephole Optimization producing
wrong MI.

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