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* [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late
[not found] <bug-31985-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-05 23:44 ` pinskia at gcc dot gnu.org
2023-06-04 18:21 ` roger at nextmovesoftware dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-05 23:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31985
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|target |middle-end
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-08-05
Build|i686-pc-linux-gnu |
Ever confirmed|0 |1
Host|i686-pc-linux-gnu |
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late
[not found] <bug-31985-4@http.gcc.gnu.org/bugzilla/>
2021-08-05 23:44 ` [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late pinskia at gcc dot gnu.org
@ 2023-06-04 18:21 ` roger at nextmovesoftware dot com
2023-06-16 15:22 ` cvs-commit at gcc dot gnu.org
2023-06-30 19:31 ` roger at nextmovesoftware dot com
3 siblings, 0 replies; 4+ messages in thread
From: roger at nextmovesoftware dot com @ 2023-06-04 18:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31985
Roger Sayle <roger at nextmovesoftware dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |roger at nextmovesoftware dot com
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |roger at nextmovesoftware dot com
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late
[not found] <bug-31985-4@http.gcc.gnu.org/bugzilla/>
2021-08-05 23:44 ` [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late pinskia at gcc dot gnu.org
2023-06-04 18:21 ` roger at nextmovesoftware dot com
@ 2023-06-16 15:22 ` cvs-commit at gcc dot gnu.org
2023-06-30 19:31 ` roger at nextmovesoftware dot com
3 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-06-16 15:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31985
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:
https://gcc.gnu.org/g:95020d33ad6991fe4fbdccf70e7133116cac68f4
commit r14-1892-g95020d33ad6991fe4fbdccf70e7133116cac68f4
Author: Roger Sayle <roger@nextmovesoftware.com>
Date: Fri Jun 16 16:18:27 2023 +0100
PR target/31985: Improve memory operand use with doubleword add.
This patch addresses the last remaining issue with PR target/31985, that
GCC could make better use of memory addressing modes when implementing
double word addition. This is achieved by adding a define_insn_and_split
that combines an *add<dwi>3_doubleword with a *concat<mode><dwi>3, so
that the components of the concat can be used directly, without first
being loaded into a double word register.
For test_c in the bugzilla PR:
Before:
pushl %ebx
subl $16, %esp
movl 28(%esp), %eax
movl 36(%esp), %ecx
movl 32(%esp), %ebx
movl 24(%esp), %edx
addl %ecx, %eax
adcl %ebx, %edx
movl %eax, 8(%esp)
movl %edx, 12(%esp)
addl $16, %esp
popl %ebx
ret
After:
test_c:
subl $20, %esp
movl 36(%esp), %eax
movl 32(%esp), %edx
addl 28(%esp), %eax
adcl 24(%esp), %edx
movl %eax, 8(%esp)
movl %edx, 12(%esp)
addl $20, %esp
ret
2023-06-16 Roger Sayle <roger@nextmovesoftware.com>
Uros Bizjak <ubizjak@gmail.com>
gcc/ChangeLog
PR target/31985
* config/i386/i386.md (*add<dwi>3_doubleword_concat): New
define_insn_and_split combine *add<dwi>3_doubleword with
a *concat<mode><dwi>3 for more efficient lowering after reload.
gcc/testsuite/ChangeLog
PR target/31985
* gcc.target/i386/pr31985.c: New test case.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late
[not found] <bug-31985-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2023-06-16 15:22 ` cvs-commit at gcc dot gnu.org
@ 2023-06-30 19:31 ` roger at nextmovesoftware dot com
3 siblings, 0 replies; 4+ messages in thread
From: roger at nextmovesoftware dot com @ 2023-06-30 19:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31985
Roger Sayle <roger at nextmovesoftware dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |14.0
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #5 from Roger Sayle <roger at nextmovesoftware dot com> ---
This is now fixed on mainline.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-08-05 23:44 ` [Bug middle-end/31985] Wide operations (i.e. adddi3) are split too late pinskia at gcc dot gnu.org
2023-06-04 18:21 ` roger at nextmovesoftware dot com
2023-06-16 15:22 ` cvs-commit at gcc dot gnu.org
2023-06-30 19:31 ` roger at nextmovesoftware dot com
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