efriedma-quic wrote:
clang specifically diagnoses always_inline functions. So for example, say you
want to write something like:
```
#include <arm_sve.h>
__attribute__((always_inline, target("+sve")))
static inline void f(void* p) __arm_streaming_compatible {
*(svuint32_t*)p = svmul_m(svptrue_b32(), *(svuint32_t*)p, *(svuint32_t*)p);
}
//////////
void g(void* p) __arm_streaming { f(p); }
```
Conceptually, this should be fine, but currently it's an error. (You can sort
of approximate it with an `#ifdef __ARM_FEATURE_SVE`, but that's pretty ugly.)
But regardless of the diagnostics, if the user specifies "+sve" on a target
that doesn't actually have SVE, we could miscompile; for example, if you call a
versioned function, clang uses the features specified in the caller.
https://github.com/llvm/llvm-project/pull/92427
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