| Issue |
145156
|
| Summary |
UBSan: Incorrect _mm_storeh_pd alignment requirement
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
justus2510
|
As far as I understand, _mm_storeh_pd does not have any alignment requirements, similar to _mm_storel_epi64. However, currently UBSan will complain about unaligned pointers:
```
#include <immintrin.h>
int main()
{
unsigned char buf[64];
_mm_storeh_pd((double *)(buf + 1), _mm_set1_pd(3.14));
}
```
```
/opt/compiler-explorer/gcc-15.1.0/lib/gcc/x86_64-linux-gnu/15.1.0/include/emmintrin.h:203:8: runtime error: store to misaligned address 0x7ffe97c63371 for type 'double', which requires 8 byte alignment
0x7ffe97c63371: note: pointer points here
1e 09 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
```
The code runs fine, and the Intel documentation does not mention any alignment requirements either.
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