| Issue |
181066
|
| Summary |
UNREACHABLE in LegalizeTypes.cpp
|
| Labels |
new issue
|
| Assignees |
aankit-ca
|
| Reporter |
androm3da
|
While building llvm-test-suite/SingleSource/Regression/C/gcc-c-torture/execute/usad-run.c
```
Unprocessed value in a map! SplitVectors
UNREACHABLE executed at /local/mnt/workspace/bcain-20260211_133912/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:183!
...
Running pass 'Hexagon DAG->DAG Pattern Instruction Selection' on function '@bar'
```
**LLVM Ref:** `release/22.x` (`75fb34ab4f460ab01b6562520f10070226d41da7`)
**Crash Script:** `usad-run-64e7c6.sh`
**Crash Source:** `usad-run-64e7c6.c`
## Minimal Reproducer Command
```bash
/local/mnt/workspace/bcain-20260211_133912/install/x86_64-linux-gnu/bin/clang -cc1 -triple hexagon-unknown-linux-musl -O3 -emit-obj -mllvm -hexagon-autohvx -target-cpu hexagonv68 -target-feature +hvx-length128b -vectorize-slp -x c /local/mnt/workspace/bcain-reduce-20260211_154112/case-usad-run-64e7c6/usad-run-64e7c6.c -o /dev/null
```
## Reduced Test Case
Reduced file: `reduced.ll` (1016 bytes)
```
target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon-unknown-linux-musl"
define i32 @bar(<16 x i8> %0, <16 x i8> %1, <16 x i8> %2) {
entry:
%3 = zext <16 x i8> %0 to <16 x i32>
%4 = zext <16 x i8> %1 to <16 x i32>
%5 = zext <16 x i8> %2 to <16 x i32>
%6 = tail call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %5)
%7 = tail call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %4)
%8 = tail call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %3)
%op.rdx.1 = or i32 %7, %8
%op.rdx.3 = or i32 %6, %op.rdx.1
ret i32 %op.rdx.3
}
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v16i32(<16 x i32>) #0
; uselistorder directives
uselistorder ptr @llvm.vector.reduce.add.v16i32, { 2, 1, 0 }
attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
```
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