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* [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> [not found] <bug-22199-10391@http.gcc.gnu.org/bugzilla/> @ 2005-12-24 20:15 ` pinskia at gcc dot gnu dot org 0 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-24 20:15 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2005-12-24 20:15 ------- Hmm, actually this is not really valid to do except when -fwrapv is supplied as (int)ABS_EXPR<(long long) 0x80000000 > is defined to be 0 but ABS_EXPR< (int)0x80000000> is undefined. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22199 ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <bug-22199-4@http.gcc.gnu.org/bugzilla/>]
* [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> [not found] <bug-22199-4@http.gcc.gnu.org/bugzilla/> @ 2021-06-03 3:35 ` pinskia at gcc dot gnu.org 2021-06-03 3:37 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-06-03 3:35 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22199 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There is ABSU now. Which we use now: a.0_1 = a; _2 = ABSU_EXPR <a.0_1>; _3 = (long int) _2; b.1_4 = b; So fixed. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> [not found] <bug-22199-4@http.gcc.gnu.org/bugzilla/> 2021-06-03 3:35 ` pinskia at gcc dot gnu.org @ 2021-06-03 3:37 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-06-03 3:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22199 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |9.0 --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Fixed with r9-1281 by the way. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/22199] New: Unnecessary casts for comparison
@ 2005-06-27 15:04 tkoenig at gcc dot gnu dot org
2005-09-24 16:22 ` [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 4+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2005-06-27 15:04 UTC (permalink / raw)
To: gcc-bugs
$ cat labs.c
extern long int labs (long int __x) __attribute__ ((__const__));
int main()
{
int a,b;
foo(&a, &b);
if (labs(a) > b)
return 1;
else
return 0;
}
is translated with
$ gcc -O3 -fdump-tree-optimized -S labs.c
into
<bb 0>:
foo (&a, &b);
return (int) (ABS_EXPR <(long int) a> > (long int) b);
The casts aren't necessary in this case.
--
Summary: Unnecessary casts for comparison
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tkoenig at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22199
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> 2005-06-27 15:04 [Bug tree-optimization/22199] New: Unnecessary casts for comparison tkoenig at gcc dot gnu dot org @ 2005-09-24 16:22 ` pinskia at gcc dot gnu dot org 0 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-09-24 16:22 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-24 16:22 ------- Changing the summary to be more reflect what this bug is about. -- What |Removed |Added ---------------------------------------------------------------------------- OtherBugsDependingO| |19987 nThis| | Last reconfirmed|2005-06-27 15:17:41 |2005-09-24 16:22:48 date| | Summary|Unnecessary casts for |fold does not optimize |comparison |(int)ABS_EXPR<(long | |long)(int_var)> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22199 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-06-03 3:37 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-22199-10391@http.gcc.gnu.org/bugzilla/>
2005-12-24 20:15 ` [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> pinskia at gcc dot gnu dot org
[not found] <bug-22199-4@http.gcc.gnu.org/bugzilla/>
2021-06-03 3:35 ` pinskia at gcc dot gnu.org
2021-06-03 3:37 ` pinskia at gcc dot gnu.org
2005-06-27 15:04 [Bug tree-optimization/22199] New: Unnecessary casts for comparison tkoenig at gcc dot gnu dot org
2005-09-24 16:22 ` [Bug tree-optimization/22199] fold does not optimize (int)ABS_EXPR<(long long)(int_var)> pinskia at gcc dot gnu dot org
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