| Issue |
145635
|
| Summary |
Miscompile with __arm_locally_streaming with -march=armv8-a+sme
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
efriedma-quic
|
Consider:
```
__arm_locally_streaming void f(int *p, int n) {
#pragma clang loop vectorize_width(4, scalable)
for (int i = 0; i < n; ++i) {
p[i]++;
}
}
```
Compile with `-march=armv8-a+sme`. The resulting assembly starts with:
```
sub sp, sp, #96
rdsvl x9, #1
lsr x9, x9, #3
str x9, [sp, #16]
mov x9, x0
bl __arm_get_current_vg
[...]
```
The bl corrupts x30.
Demo at https://godbolt.org/z/Ga9zaWEen
Workarounds:
- Use `-march=armv8-a+sve+sme` or similar
- Use -mno-omit-leaf-frame-pointer
CC @sdesmalen-arm @MacDue
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