| Issue |
141653
|
| Summary |
[SystemZ] Crash with `SystemZConvCC` intrinsics
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
sayantn
|
When this IR is compiled
```llvm
define void @foo(ptr dead_on_unwind noalias nocapture noundef writable writeonly sret([24 x i8]) align 8 dereferenceable(24) initializes((0, 20)) %_0, ptr noalias nocapture noundef readonly align 8 dereferenceable(16) %a, ptr noalias nocapture noundef readonly align 8 dereferenceable(16) %b, ptr noalias nocapture noundef readonly align 8 dereferenceable(16) %c) unnamed_addr #0 {
start:
%0 = load <16 x i8>, ptr %a, align 8
%1 = load <16 x i8>, ptr %b, align 8
%2 = load <16 x i8>, ptr %c, align 8
%3 = tail call { <16 x i8>, i32 } @llvm.s390.vstrsb(<16 x i8> %0, <16 x i8> %1, <16 x i8> %2) #2
%4 = extractvalue { <16 x i8>, i32 } %3, 0
%5 = extractvalue { <16 x i8>, i32 } %3, 1
store <16 x i8> %4, ptr %_0, align 8
%6 = getelementptr inbounds nuw i8, ptr %_0, i64 16
store i32 %5, ptr %6, align 8
ret void
}
declare { <16 x i8>, i32 } @llvm.s390.vstrsb(<16 x i8>, <16 x i8>, <16 x i8>) #1
attributes #0 = { nofree nosync nounwind memory(argmem: readwrite) uwtable "probe-stack"="inline-asm" "target-cpu"="z10" "target-features"="+vector" }
attributes #1 = { nofree nosync nounwind memory(none) }
attributes #2 = { nounwind }
```
`llc` crashes with
```
LLVM ERROR: Cannot select: 0x3dcc0ab8: v16i8,i32 = SystemZISD::VSTRS_CC 0x3dcc0860, 0x3dcc08d8, 0x3dcc0950
0x3dcc0860: v16i8,ch = load<(dereferenceable load (s128) from %ir.a, align 8)> 0x3dc91c30, 0x3dcc0518, undef:i64
0x3dcc0518: i64,ch = CopyFromReg 0x3dc91c30, Register:i64 %1
0x3dcc04a0: i64 = Register %1
0x3dcc07e8: i64 = undef
0x3dcc08d8: v16i8,ch = load<(dereferenceable load (s128) from %ir.b, align 8)> 0x3dc91c30, 0x3dcc0608, undef:i64
0x3dcc0608: i64,ch = CopyFromReg 0x3dc91c30, Register:i64 %2
0x3dcc0590: i64 = Register %2
0x3dcc07e8: i64 = undef
0x3dcc0950: v16i8,ch = load<(dereferenceable load (s128) from %ir.c, align 8)> 0x3dc91c30, 0x3dcc06f8, undef:i64
0x3dcc06f8: i64,ch = CopyFromReg 0x3dc91c30, Register:i64 %3
0x3dcc0680: i64 = Register %3
0x3dcc07e8: i64 = undef
In function: foo
```
[Godbolt (also contains the Rust code that generated this IR)](https://godbolt.org/z/x6z9G8P96)
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