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* [Bug target/106583] New: Suboptimal immediate generation on aarch64
@ 2022-08-11 9:01 ktkachov at gcc dot gnu.org
2022-10-19 16:14 ` [Bug target/106583] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: ktkachov at gcc dot gnu.org @ 2022-08-11 9:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
Bug ID: 106583
Summary: Suboptimal immediate generation on aarch64
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
A simple codegen issue:
unsigned long long
foo (void)
{
return 0x7efefefefefefeff;
}
generates at -O2
foo:
mov x0, 65279
movk x0, 0xfefe, lsl 16
movk x0, 0xfefe, lsl 32
movk x0, 0x7efe, lsl 48
ret
whereas LLVM can do:
foo: // @foo
mov x0, #-72340172838076674
movk x0, #65279
movk x0, #32510, lsl #48
ret
Should be a matter of just making aarch64_internal_mov_immediate in aarch64.cc
a bit smarter
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/106583] Suboptimal immediate generation on aarch64
2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
@ 2022-10-19 16:14 ` pinskia at gcc dot gnu.org
2022-10-19 16:14 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-19 16:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-10-19
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/106583] Suboptimal immediate generation on aarch64
2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
2022-10-19 16:14 ` [Bug target/106583] " pinskia at gcc dot gnu.org
@ 2022-10-19 16:14 ` pinskia at gcc dot gnu.org
2022-10-24 14:36 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-19 16:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/106583] Suboptimal immediate generation on aarch64
2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
2022-10-19 16:14 ` [Bug target/106583] " pinskia at gcc dot gnu.org
2022-10-19 16:14 ` pinskia at gcc dot gnu.org
@ 2022-10-24 14:36 ` cvs-commit at gcc dot gnu.org
2022-10-25 12:05 ` wilco at gcc dot gnu.org
2022-10-31 19:21 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-10-24 14:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wilco@gcc.gnu.org>:
https://gcc.gnu.org/g:a096036589d82175a0f729c2dab73c9a527d075d
commit r13-3459-ga096036589d82175a0f729c2dab73c9a527d075d
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Mon Oct 24 15:14:14 2022 +0100
[AArch64] Improve immediate expansion [PR106583]
Improve immediate expansion of immediates which can be created from a
bitmask immediate and 2 MOVKs. Simplify, refactor and improve efficiency
of bitmask checks. Move various immediate handling functions together
to avoid forward declarations.
This reduces the number of 4-instruction immediates in SPECINT/FP by
10-15%.
gcc/
PR target/106583
* config/aarch64/aarch64.cc (aarch64_internal_mov_immediate)
Add support for a bitmask immediate with 2 MOVKs.
(aarch64_check_bitmask): New function after refactorization.
(aarch64_bitmask_imm): Simplify replication of small modes.
Split function into 64-bit only version for efficiency.
(aarch64_move_imm): Move near other immediate functions.
(aarch64_uimm12_shift): Likewise.
(aarch64_clamp_to_uimm12_shift): Likewise.
(aarch64_movk_shift): Likewise.
(aarch64_replicate_bitmask_imm): Likewise.
(aarch64_and_split_imm1): Likewise.
(aarch64_and_split_imm2): Likewise.
(aarch64_and_bitmask_imm): Likewise.
(aarch64_movw_imm): Likewise.
gcc/testsuite/
PR target/106583
* gcc.target/aarch64/pr106583.c: Add new test.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/106583] Suboptimal immediate generation on aarch64
2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
` (2 preceding siblings ...)
2022-10-24 14:36 ` cvs-commit at gcc dot gnu.org
@ 2022-10-25 12:05 ` wilco at gcc dot gnu.org
2022-10-31 19:21 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: wilco at gcc dot gnu.org @ 2022-10-25 12:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
Wilco <wilco at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilco at gcc dot gnu.org
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #3 from Wilco <wilco at gcc dot gnu.org> ---
Fixed
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/106583] Suboptimal immediate generation on aarch64
2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
` (3 preceding siblings ...)
2022-10-25 12:05 ` wilco at gcc dot gnu.org
@ 2022-10-31 19:21 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-31 19:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-10-31 19:21 UTC | newest]
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2022-08-11 9:01 [Bug target/106583] New: Suboptimal immediate generation on aarch64 ktkachov at gcc dot gnu.org
2022-10-19 16:14 ` [Bug target/106583] " pinskia at gcc dot gnu.org
2022-10-19 16:14 ` pinskia at gcc dot gnu.org
2022-10-24 14:36 ` cvs-commit at gcc dot gnu.org
2022-10-25 12:05 ` wilco at gcc dot gnu.org
2022-10-31 19:21 ` pinskia at gcc dot gnu.org
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