| Issue |
180497
|
| Summary |
[AArch64] Unreachable "unexpected element count for vector"
|
| Labels |
backend:AArch64
|
| Assignees |
|
| Reporter |
sjoerdmeijer
|
This IR:
```
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32"
target triple = "aarch64-unknown-linux-gnu"
define <vscale x 1 x i1> @_Z4testbjhyhixbixjthshiPhPjPxS1_PbPA17_A17_yS_PA17_A17_aPA17_A17_xPA17_A17_bSB_PS3_SB_S5_PA24_sS_S2_PA24_SG_PiS_PA18_A18_jPtPA18_A18_t() #0 {
entry:
%broadcast.splatinsert1188 = insertelement <vscale x 1 x i1> zeroinitializer, i1 false, i64 0
ret <vscale x 1 x i1> %broadcast.splatinsert1188
}
attributes #0 = { "target-cpu"="grace" }
```
Triggers this assert / unreachable:
```
unexpected element count for vector
UNREACHABLE executed at llvm-project/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp:227!
```
Stack trace:
```
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'AArch64 Instruction Selection' on function '@_Z4testbjhyhixbixjthshiPhPjPxS1_PbPA17_A17_yS_PA17_A17_aPA17_A17_xPA17_A17_bSB_PS3_SB_S5_PA24_sS_S2_PA24_SG_PiS_PA18_A18_jPtPA18_A18_t'
#0 0x00000000042e2088 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x42e2088)
#1 0x00000000042def64 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x000071a0f8842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x000071a0f88969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x000071a0f8842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x000071a0f88287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x00000000042238fa (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x42238fa)
#7 0x0000000000b16d73 (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0xb16d73)
#8 0x0000000000b7d917 llvm::AArch64TargetLowering::LowerINSERT_VECTOR_ELT(llvm::SDValue, llvm::SelectionDAG&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0xb7d917)
#9 0x0000000000be06e3 llvm::AArch64TargetLowering::LowerOperation(llvm::SDValue, llvm::SelectionDAG&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0xbe06e3)
```
See also: https://godbolt.org/z/8nna63zq9
This can be triggered from source-code.
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