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* [Bug target/100868] New: PPC: Inefficient code for vec_reve(vector double)
@ 2021-06-02 7:28 jens.seifert at de dot ibm.com
2021-06-02 15:23 ` [Bug target/100868] " segher at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jens.seifert at de dot ibm.com @ 2021-06-02 7:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100868
Bug ID: 100868
Summary: PPC: Inefficient code for vec_reve(vector double)
Product: gcc
Version: 8.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jens.seifert at de dot ibm.com
Target Milestone: ---
Input:
vector double reve(vector double a)
{
return vec_reve(a);
}
creates:
_Z4reveDv2_d:
.LFB3:
.cfi_startproc
.LCF3:
0: addis 2,12,.TOC.-.LCF3@ha
addi 2,2,.TOC.-.LCF3@l
.localentry _Z4reveDv2_d,.-_Z4reveDv2_d
addis 9,2,.LC2@toc@ha
addi 9,9,.LC2@toc@l
lvx 0,0,9
xxlnor 32,32,32
vperm 2,2,2,0
blr
Optimal sequence would be:
vector double reve_pwr7(vector double a)
{
return vec_xxpermdi(a,a,2);
}
which creates:
_Z9reve_pwr7Dv2_d:
.LFB4:
.cfi_startproc
xxpermdi 34,34,34,2
blr
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/100868] PPC: Inefficient code for vec_reve(vector double)
2021-06-02 7:28 [Bug target/100868] New: PPC: Inefficient code for vec_reve(vector double) jens.seifert at de dot ibm.com
@ 2021-06-02 15:23 ` segher at gcc dot gnu.org
2021-11-23 8:33 ` cvs-commit at gcc dot gnu.org
2021-12-07 3:42 ` guihaoc at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: segher at gcc dot gnu.org @ 2021-06-02 15:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100868
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2021-06-02
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/100868] PPC: Inefficient code for vec_reve(vector double)
2021-06-02 7:28 [Bug target/100868] New: PPC: Inefficient code for vec_reve(vector double) jens.seifert at de dot ibm.com
2021-06-02 15:23 ` [Bug target/100868] " segher at gcc dot gnu.org
@ 2021-11-23 8:33 ` cvs-commit at gcc dot gnu.org
2021-12-07 3:42 ` guihaoc at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-11-23 8:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100868
--- Comment #2 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:f4eae6450e46224454ce067ac43bd7e9f66fc18b
commit r12-5463-gf4eae6450e46224454ce067ac43bd7e9f66fc18b
Author: Haochen Gui <guihaoc@gcc.gnu.org>
Date: Wed Nov 17 16:16:02 2021 +0800
rs6000: Optimize code generation of vec_reve [PR100868]
gcc/
PR target/100868
* config/rs6000/altivec.md (altivec_vreve<mode>2 for VEC_K): Use
xxbrq for v16qi, xxbrq + xxbrh for v8hi and xxbrq + xxbrw for v4si
or v4sf when p9_vector is set.
(altivec_vreve<mode>2 for VEC_64): Defined. Implemented by xxswapd.
gcc/testsuite/
PR target/100868
* gcc.target/powerpc/vec_reve_1.c: New test.
* gcc.target/powerpc/vec_reve_2.c: Likewise.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/100868] PPC: Inefficient code for vec_reve(vector double)
2021-06-02 7:28 [Bug target/100868] New: PPC: Inefficient code for vec_reve(vector double) jens.seifert at de dot ibm.com
2021-06-02 15:23 ` [Bug target/100868] " segher at gcc dot gnu.org
2021-11-23 8:33 ` cvs-commit at gcc dot gnu.org
@ 2021-12-07 3:42 ` guihaoc at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: guihaoc at gcc dot gnu.org @ 2021-12-07 3:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100868
HaoChen Gui <guihaoc at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
CC| |guihaoc at gcc dot gnu.org
Status|NEW |RESOLVED
--- Comment #3 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
Fixed on trunk.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-06-02 7:28 [Bug target/100868] New: PPC: Inefficient code for vec_reve(vector double) jens.seifert at de dot ibm.com
2021-06-02 15:23 ` [Bug target/100868] " segher at gcc dot gnu.org
2021-11-23 8:33 ` cvs-commit at gcc dot gnu.org
2021-12-07 3:42 ` guihaoc at gcc dot gnu.org
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