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* [Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS.
@ 2021-05-05 13:55 rguenth at gcc dot gnu.org
2021-05-05 13:56 ` [Bug tree-optimization/100434] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-05 13:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100434
Bug ID: 100434
Summary: DSE fails to DSE aggregate LHS.
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
struct X { int x; };
extern struct X foo (void);
struct X x;
void bar()
{
x = foo();
x = (struct X){};
}
the store to x from the call to foo() is not DSEd. It works for aggregate
copies
x = y; though.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/100434] DSE fails to DSE aggregate LHS.
2021-05-05 13:55 [Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS rguenth at gcc dot gnu.org
@ 2021-05-05 13:56 ` rguenth at gcc dot gnu.org
2021-05-10 9:41 ` cvs-commit at gcc dot gnu.org
2021-05-10 9:45 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-05 13:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100434
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Blocks| |44462
Ever confirmed|0 |1
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Last reconfirmed| |2021-05-05
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44462
[Bug 44462] Redundant looping pure functions whose return value is dead are not
optimized out
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/100434] DSE fails to DSE aggregate LHS.
2021-05-05 13:55 [Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS rguenth at gcc dot gnu.org
2021-05-05 13:56 ` [Bug tree-optimization/100434] " rguenth at gcc dot gnu.org
@ 2021-05-10 9:41 ` cvs-commit at gcc dot gnu.org
2021-05-10 9:45 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-10 9:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100434
--- 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:a564da506f52be66ade298b562417641e87b549f
commit r12-656-ga564da506f52be66ade298b562417641e87b549f
Author: Richard Biener <rguenther@suse.de>
Date: Wed May 5 16:15:12 2021 +0200
tree-optimization/100434 - DSE aggregate call LHS
This makes DSE consider aggregate LHS of calls as dead, for pure
or const calls the whole stmt and for others by removing the LHS.
2021-05-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/100434
* tree-ssa-dse.c (initialize_ao_ref_for_dse): Handle
call LHS.
(dse_optimize_stmt): Handle call LHS by dropping the
LHS or the whole call if it doesn't have other
side-effects.
(pass_dse::execute): Adjust.
* gcc.dg/tree-ssa/ssa-dse-43.c: New testcase.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/100434] DSE fails to DSE aggregate LHS.
2021-05-05 13:55 [Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS rguenth at gcc dot gnu.org
2021-05-05 13:56 ` [Bug tree-optimization/100434] " rguenth at gcc dot gnu.org
2021-05-10 9:41 ` cvs-commit at gcc dot gnu.org
@ 2021-05-10 9:45 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-10 9:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100434
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-05-05 13:55 [Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS rguenth at gcc dot gnu.org
2021-05-05 13:56 ` [Bug tree-optimization/100434] " rguenth at gcc dot gnu.org
2021-05-10 9:41 ` cvs-commit at gcc dot gnu.org
2021-05-10 9:45 ` rguenth at gcc dot gnu.org
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