[Bug target/96918] Failure to optimize vector shift left+shift right+or to pshuf

jakub at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Sep 3 20:57:28 GMT 2020


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96918

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Or the generic code could try to expand vector rotates by multiplies of
BITS_PER_UNIT as vector permutations, perhaps only if there is no optab for it.
 Or trying to expand both permutation and rotate and determine at expansion
time using costs which sequence is cheaper.


More information about the Gcc-bugs mailing list