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* [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape
@ 2005-07-29 13:40 pinskia at gcc dot gnu dot org
2005-07-29 13:43 ` [Bug tree-optimization/23134] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-29 13:40 UTC (permalink / raw)
To: gcc-bugs
Take this "stupid" example (even though this most likely shows up in GCC but I don't know for sure):
int g1(int);
static void h(int *a) { *a = 1; }
int g(void)
{
int t = 0;
h(&t);
int t1 = t;
g1(t1);
return t1 == t;
}
That return should have been turned into "return 1" as t does not escape via h as h only touches it.
Compile with -O3 -fno-inline to see the problem.
--
Summary: Address escapes even though the called function does not
cause it to escape
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: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23134
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/23134] Address escapes even though the called function does not cause it to escape 2005-07-29 13:40 [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape pinskia at gcc dot gnu dot org @ 2005-07-29 13:43 ` pinskia at gcc dot gnu dot org 2005-07-29 14:29 ` belyshev at depni dot sinp dot msu dot ru 2005-08-11 17:20 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-07-29 13:43 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |alias http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23134 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/23134] Address escapes even though the called function does not cause it to escape 2005-07-29 13:40 [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape pinskia at gcc dot gnu dot org 2005-07-29 13:43 ` [Bug tree-optimization/23134] " pinskia at gcc dot gnu dot org @ 2005-07-29 14:29 ` belyshev at depni dot sinp dot msu dot ru 2005-08-11 17:20 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: belyshev at depni dot sinp dot msu dot ru @ 2005-07-29 14:29 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From belyshev at depni dot sinp dot msu dot ru 2005-07-29 13:57 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-07-29 13:57:51 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23134 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/23134] Address escapes even though the called function does not cause it to escape 2005-07-29 13:40 [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape pinskia at gcc dot gnu dot org 2005-07-29 13:43 ` [Bug tree-optimization/23134] " pinskia at gcc dot gnu dot org 2005-07-29 14:29 ` belyshev at depni dot sinp dot msu dot ru @ 2005-08-11 17:20 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-11 17:20 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-11 17:20 ------- I think the FIXME in tree-ssa-operands.c is the issue here: /* FIXME - if we have better information from the static vars analysis, we need to make the cache call site specific. This way we can have the performance benefits even if we are doing good optimization. */ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23134 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-08-11 17:20 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-07-29 13:40 [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape pinskia at gcc dot gnu dot org 2005-07-29 13:43 ` [Bug tree-optimization/23134] " pinskia at gcc dot gnu dot org 2005-07-29 14:29 ` belyshev at depni dot sinp dot msu dot ru 2005-08-11 17:20 ` pinskia at gcc dot gnu dot org
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