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: unassignedb...@nondot.org
Reporter: timshe...@gmail.com
CC: llvm-bugs@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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