https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98856
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For arithmetic >> (element_precision - 1) one can just use
{,v}pxor + {,v}pcmpgtq, as in instead of return vec >> 63; do return vec < 0;
(in C++-ish way), aka VEC_COND_EXPR vec < 0, { all ones }, { 0 }
For other arithmetic shifts by scalar constant, perhaps one can replace
return vec >> 17; with return (vectype) ((uvectype) vec >> 17) | ((vec < 0) <<
(64 - 17));
- it will actually work even for non-constant scalar shift amounts because
{,v}psllq treats shift counts > 63 as 0.
