https://llvm.org/bugs/show_bug.cgi?id=26661
Bug ID: 26661
Summary: [AVX512BW] Crash with shuffle lowering as zero extend
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
AVX512 bw targets fail to select VZEXT (pmovzxbw)for the below example.
define <16 x i16> @zext_32x8_to_16x16(<32 x i8> %a) nounwind readnone {
%1 = shufflevector <32 x i8> %a, <32 x i8> zeroinitializer, <32 x i32> <i32
0, i32 32, i32 1, i32 32, i32 2, i32 32, i32 3, i32 32, i32 4, i32 32, i32 5,
i32 32, i32 6, i32 32, i32 7, i32 32, i32 8, i32 32, i32 9, i32 32, i32 10, i32
32, i32 11, i32 32, i32 12, i32 32, i32 13, i32 32, i32 14, i32 32, i32 15, i32
32>
%2 = bitcast <32 x i8> %1 to <16 x i16>
ret <16 x i16> %2
}
llc -mtriple=x86_64-unknown -mcpu=skx test.ll -o -
LLVM ERROR: Cannot select: t12: v16i16 = X86ISD::VZEXT t2
t2: v32i8,ch = CopyFromReg t0, Register:v32i8 %vreg0
t1: v32i8 = Register %vreg0
In function: zext_32x8_to_16x16
This appears to be related to the changes to the predicate filtering from
D16595 / rL258915.
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