https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81593
Bug ID: 81593
Summary: Optimize PowerPC vector set from vector extract
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
Created attachment 41851
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41851&action=edit
File to show the problem.
If we doing a vector set for 64-bit DF/DI mode values on PowerPC VSX system,
and one or both of the values used in the set came from a vector extract, we
can optimize things to do only one XXPERMDI instead of doing 3 XXPERMDI's (2 to
isolate each element, and a third to recombine them back together again).
