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* [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code
@ 2021-06-07 20:08 hjl.tools at gmail dot com
2021-06-08 7:52 ` [Bug middle-end/100951] " rguenth at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2021-06-07 20:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100951
Bug ID: 100951
Summary: vec_duplicate<mode> leads to worse code
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: rguenther at suse dot de
Target Milestone: ---
After I added
;; Modes handled by broadcast patterns.
(define_mode_iterator INT_BROADCAST_MODE
[(V64QI "TARGET_AVX512F") (V32QI "TARGET_AVX") V16QI
(V32HI "TARGET_AVX512F") (V16HI "TARGET_AVX") V8HI
(V16SI "TARGET_AVX512F") (V8SI "TARGET_AVX") V4SI
(V8DI "TARGET_AVX512F") (V4DI "TARGET_64BIT") V2DI])
;; Broadcast from an integer. NB: Enable broadcast only if we can move
;; from GPR to SSE register directly. */
(define_expand "vec_duplicate<mode>"
[(set (match_operand:INT_BROADCAST_MODE 0 "register_operand")
(vec_duplicate:INT_BROADCAST_MODE
(match_operand:<ssescalarmode> 1 "nonimmediate_operand")))]
"TARGET_SSE2 && TARGET_INTER_UNIT_MOVES_TO_VEC"
{
ix86_expand_integer_vec_duplicate (operands);
DONE;
})
to x86 backend, I got
[hjl@gnu-cfl-2 gcc]$ cat /tmp/x.c
typedef short __attribute__((__vector_size__ (8 * sizeof (short)))) V;
V v, w;
void
foo (void)
{
w = __builtin_shuffle (v != v, 0 < (V) {}, (V) {192} >> 5);
}
[hjl@gnu-cfl-2 gcc]$ ./xgcc -B./ -S /tmp/x.c
[hjl@gnu-cfl-2 gcc]$ cat x.s
.file "x.c"
.text
.globl v
.bss
.align 16
.type v, @object
.size v, 16
v:
.zero 16
.globl w
.align 16
.type w, @object
.size w, 16
w:
.zero 16
.text
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl $0, %eax
movd %eax, %xmm0
punpcklwd %xmm0, %xmm0
pshufd $0, %xmm0, %xmm0
movaps %xmm0, w(%rip)
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 12.0.0 20210607 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-2 gcc]$
since middld-end leaves us with an unfolded constant CTOR.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/100951] vec_duplicate<mode> leads to worse code
2021-06-07 20:08 [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code hjl.tools at gmail dot com
@ 2021-06-08 7:52 ` rguenth at gcc dot gnu.org
2021-06-08 8:48 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-06-08 7:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100951
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Last reconfirmed| |2021-06-08
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing patch.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/100951] vec_duplicate<mode> leads to worse code
2021-06-07 20:08 [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code hjl.tools at gmail dot com
2021-06-08 7:52 ` [Bug middle-end/100951] " rguenth at gcc dot gnu.org
@ 2021-06-08 8:48 ` cvs-commit at gcc dot gnu.org
2021-06-08 8:48 ` rguenth at gcc dot gnu.org
2021-09-17 6:48 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-06-08 8:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100951
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:ffe3a37f54ab866d85bdde48c2a32be5e09d8515
commit r12-1280-gffe3a37f54ab866d85bdde48c2a32be5e09d8515
Author: Richard Biener <rguenther@suse.de>
Date: Mon Jun 7 20:08:13 2021 +0200
middle-end/100951 - make sure to generate VECTOR_CST in lowering
When vector lowering creates piecewise ops make sure to create
VECTOR_CSTs instead of CONSTRUCTORs when possible.
gcc/
2021-06-07 Richard Biener <rguenther@suse.de>
PR middle-end/100951
* tree-vect-generic.c (expand_vector_piecewise): Build a
VECTOR_CST if all elements are constant.
(expand_vector_condition): Likewise.
(lower_vec_perm): Likewise.
(expand_vector_conversion): Likewise.
gcc/testsuite/
2021-06-07 H.J. Lu <hjl.tools@gmail.com>
PR middle-end/100951
* gcc.target/i386/pr100951.c: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/100951] vec_duplicate<mode> leads to worse code
2021-06-07 20:08 [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code hjl.tools at gmail dot com
2021-06-08 7:52 ` [Bug middle-end/100951] " rguenth at gcc dot gnu.org
2021-06-08 8:48 ` cvs-commit at gcc dot gnu.org
@ 2021-06-08 8:48 ` rguenth at gcc dot gnu.org
2021-09-17 6:48 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-06-08 8:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100951
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/100951] vec_duplicate<mode> leads to worse code
2021-06-07 20:08 [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code hjl.tools at gmail dot com
` (2 preceding siblings ...)
2021-06-08 8:48 ` rguenth at gcc dot gnu.org
@ 2021-09-17 6:48 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-17 6:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100951
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |12.0
^ permalink raw reply [flat|nested] 5+ messages in thread
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2021-06-07 20:08 [Bug middle-end/100951] New: vec_duplicate<mode> leads to worse code hjl.tools at gmail dot com
2021-06-08 7:52 ` [Bug middle-end/100951] " rguenth at gcc dot gnu.org
2021-06-08 8:48 ` cvs-commit at gcc dot gnu.org
2021-06-08 8:48 ` rguenth at gcc dot gnu.org
2021-09-17 6:48 ` pinskia at gcc dot gnu.org
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