Jakob Koschel 537f3d3a75 [SafeStack] Fix crashing with scalable TypeSizes (#180547) ...

On e.g. aarch64 the TypeSize of scalar types can have a size that is not
known at compile time.
Currently when safestack occurs those it simply crashes as described in
https://github.com/llvm/llvm-project/issues/175868.

Since we cannot verify the size at compile time we simply consider the
access to be unsafe (in regards to safestack).

Reproducer:
```
#include <arm_sve.h>

int main() {
    svint32_t vec = svindex_s32(0, 1);
    svint32_t res = svadd_s32_z(svptrue_b32(), vec, vec);
    int32_t buffer[1024];
    svst1_s32(svptrue_b32(), buffer, res);
    return 0;
}
```

2026-03-04 16:11:44 -08:00

37 KiB

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