https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81389
rockeet <rockeet at gmail dot com> changed:
What |Removed |Added
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Status|RESOLVED |REOPENED
Resolution|INVALID |---
--- Comment #7 from rockeet <rockeet at gmail dot com> ---
@Marc @Jakub @Martin
Intel CPU document says: operand of _mm_cmpestri can be memory or mm register,
when the operand is memory, it does not require alignment.
The issue is: GCC does not know this knowledge(memory operand need not memory
align), and there is no way to enforce gcc to generate a _mm_cmpestri which
always use memory operand, not mm register.
If I manually load the unaligned memory into an aligned `__m128i`, it has
performance penalty on optimizing compilation.
At last, we can always use `asm` to workaround this issue, but this is not the
ideal solution!
