[Bug target/87599] Broadcasting scalar to vector uses stack unnecessarily on x86

amonakov at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri Oct 12 16:19:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87599

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #3 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
The problem is when movddup is available (with -msse3), IRA selects the movddup
alternative in the vec_dupv2di pattern - perhaps something is off there?

(to be clear: '-O2 -mtune=intel' - good, '-O2 -mtune=intel -msse3' - bad)


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