[Bug c/107836] x86_64 inline functions -O2/-O3 optimization error

["czx211355007 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107836

--- Comment #3 from Zixuan Chen <czx211355007 at gmail dot com> ---
I think there is a data dependency between the second asm statement and the
third, a read-after-write one. If the third one is moved to the top then we
can't get the correct value of mm5(mm0). Also, could you explain why the
result using -O1 to compile is correct as expected where the asm statements
remain in the same order as they should be?

schwab@linux-m68k.org <gcc-bugzilla@gcc.gnu.org> 于2022年11月23日周三 23:48写道：

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107836
>
> Andreas Schwab <schwab@linux-m68k.org> changed:
>
>            What    |Removed                     |Added
>
> ----------------------------------------------------------------------------
>          Resolution|---                         |INVALID
>              Status|UNCONFIRMED                 |RESOLVED
>
> --- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
> There is no dependency whatsoever between the asm statements, thus they
> can be
> moved around freely. Especially the third one is producing a constant
> output as
> seen by the compiler, thus moving it to the top of the function is
> perfectly
> valid.
>
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