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* [Bug target/110429] New: Redundant vector extract instruction on P9
@ 2023-06-27 9:12 guihaoc at gcc dot gnu.org
2023-08-16 6:55 ` [Bug target/110429] " cvs-commit at gcc dot gnu.org
2023-08-17 5:26 ` guihaoc at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: guihaoc at gcc dot gnu.org @ 2023-06-27 9:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110429
Bug ID: 110429
Summary: Redundant vector extract instruction on P9
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: guihaoc at gcc dot gnu.org
Target Milestone: ---
//test.c
#include <altivec.h>
void extract_int_2 (int *p, vector int a) { *p = vec_extract (a, 2); }
On P9 LE, it generates
xxextractuw 34,34,4
stxsiwx 34,0,3
The xxextractuw is unnecessary as the extracted int is just at word[1].
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug target/110429] Redundant vector extract instruction on P9 2023-06-27 9:12 [Bug target/110429] New: Redundant vector extract instruction on P9 guihaoc at gcc dot gnu.org @ 2023-08-16 6:55 ` cvs-commit at gcc dot gnu.org 2023-08-17 5:26 ` guihaoc at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2023-08-16 6:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110429 --- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by HaoChen Gui <guihaoc@gcc.gnu.org>: https://gcc.gnu.org/g:d471bdb0453de7b738f49148b66d57cb5871937d commit r14-3237-gd471bdb0453de7b738f49148b66d57cb5871937d Author: Haochen Gui <guihaoc@gcc.gnu.org> Date: Wed Aug 16 14:29:36 2023 +0800 rs6000: Skip unnecessary vector extract for certain elements. If the extracted element index is: - for byte, 7 on BE while 8 on LE; - for half word, 3 on BE while 4 on LE; the element to be stored is already in the corresponding place for stxsi[hb]x. We don't need a redundant vector extraction at all. gcc/ PR target/110429 * config/rs6000/vsx.md (*vsx_extract_<mode>_store_p9): Skip vector extract when the element is 7 on BE while 8 on LE for byte or 3 on BE while 4 on LE for halfword. gcc/testsuite/ PR target/110429 * gcc.target/powerpc/pr110429.c: New. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/110429] Redundant vector extract instruction on P9 2023-06-27 9:12 [Bug target/110429] New: Redundant vector extract instruction on P9 guihaoc at gcc dot gnu.org 2023-08-16 6:55 ` [Bug target/110429] " cvs-commit at gcc dot gnu.org @ 2023-08-17 5:26 ` guihaoc at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: guihaoc at gcc dot gnu.org @ 2023-08-17 5:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110429 HaoChen Gui <guihaoc at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Status|UNCONFIRMED |RESOLVED --- Comment #2 from HaoChen Gui <guihaoc at gcc dot gnu.org> --- Fixed ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-08-17 5:26 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-06-27 9:12 [Bug target/110429] New: Redundant vector extract instruction on P9 guihaoc at gcc dot gnu.org 2023-08-16 6:55 ` [Bug target/110429] " cvs-commit at gcc dot gnu.org 2023-08-17 5:26 ` guihaoc at gcc dot gnu.org
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