https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88671

H.J. Lu <hjl.tools at gmail dot com> changed:

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                 CC|                            |hjl.tools at gmail dot com

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Uroš Bizjak from comment #2)
> This is required by ABI, please see section 2.3.3 of i386 PSABI, where:
> 
> The exceptions to parameters passed on stack are as follows:
> • The first three parameters of type __m64 are passed in %mm0, %mm1, and
> %mm2.
> 
> So, clang is wrong.

clang is never good at conforming to psABIs:

https://bugs.llvm.org/show_bug.cgi?id=39501

There are other psABI bugs in clang.

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