https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111856
Bug ID: 111856
Summary: GCC: 14: internal compiler error: in as_a, at
machmode.h:381
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: 141242068 at smail dot nju.edu.cn
Target Milestone: ---
When compile this program with option `-fopenmp-simd`, gcc crashes:
```
typedef void T;
int array[1000];
#pragma omp declare simd notinbranch simdlen(4)
T foo (int i)
{
array[i] = 555;
}
```
Compiler Explorer: https://gcc.godbolt.org/z/Tq665jvzP
Interestingly, by bypassing the `typedef` and directly defining foo's return
type as void, the crash disappears:
```
int array[1000];
#pragma omp declare simd notinbranch simdlen(4)
void foo (int i)
{
array[i] = 555;
}
```
The stack dump:
```
during IPA pass: simdclone
<source>: In function 'foo.simdclone.0':
<source>:8:1: internal compiler error: in as_a, at machmode.h:381
8 | }
| ^
0x230ff8e internal_error(char const*, ...)
???:0
0x9fe390 fancy_abort(char const*, int, char const*)
???:0
0x1fa0c9f expand_simd_clones(cgraph_node*)
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
```
