[Bug target/84033] powerpc64le -moptimize-swaps bad code with vec_vbpermq
amodra at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Jan 29 04:23:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84033
--- Comment #4 from Alan Modra <amodra at gcc dot gnu.org> ---
Author: amodra
Date: Mon Jan 29 04:23:00 2018
New Revision: 257135
URL: https://gcc.gnu.org/viewcvs?rev=257135&root=gcc&view=rev
Log:
PR84033, powerpc64le -moptimize-swaps bad code with vec_vbpermq
vbpermq produces its output in bits 48..63 of the target vector reg,
so the output cannot be lane swapped.
gcc/
PR target/84033
* config/rs6000/rs6000.c (rtx_is_swappable_p): Exclude
UNSPEC_VBPERMQ.
gcc/testsuite/
PR target/84033
* gcc.target/powerpc/swaps-p8-46.c: New.
Backport svn r257070
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/swaps-p8-46.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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