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* [Bug tree-optimization/20165] New: Pointer does not really escape with write @ 2005-02-23 18:21 pinskia at gcc dot gnu dot org 2005-02-23 23:29 ` [Bug tree-optimization/20165] " 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 @ 2005-02-23 18:21 UTC (permalink / raw) To: gcc-bugs Take the following fortran code (were we know that write does not make the pointer escape): program main dimension x(10) write(3)n,(x(n),n=1,10) end in the last tree dump we get: _gfortran_transfer_integer (&n, 4); n = 1; <L0>:; _gfortran_transfer_real (&x[n + -1], 4); n.3 = n; n = n.3 + 1; if (n.3 == 10) goto <L4>; else goto <L0>; See how n is marked as not a gimple variable which causes us to store it on the stack. Even though we know that _gfortran_transfer_real will not cause the pointer to escape. There should be a new attribute to mark functions as causing pointers not to escape at all. -- Summary: Pointer does not really escape with write Product: gcc Version: 4.0.0 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=20165 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/20165] Pointer does not really escape with write 2005-02-23 18:21 [Bug tree-optimization/20165] New: Pointer does not really escape with write pinskia at gcc dot gnu dot org @ 2005-02-23 23:29 ` pinskia at gcc dot gnu dot org 2005-03-01 18:12 ` pinskia at gcc dot gnu dot org 2005-08-31 15:09 ` dberlin at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-02-23 23:29 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-23 18:59 ------- A C testcase (scanf this time): #include <stdio.h> int main(void) { int i; int j; scanf("%d", &i); for(;i<=0;i--) printf("H"); return 0; } -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20165 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/20165] Pointer does not really escape with write 2005-02-23 18:21 [Bug tree-optimization/20165] New: Pointer does not really escape with write pinskia at gcc dot gnu dot org 2005-02-23 23:29 ` [Bug tree-optimization/20165] " pinskia at gcc dot gnu dot org @ 2005-03-01 18:12 ` pinskia at gcc dot gnu dot org 2005-08-31 15:09 ` dberlin at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-03-01 18:12 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-03-01 18:11 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-03-01 18:11:59 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20165 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/20165] Pointer does not really escape with write 2005-02-23 18:21 [Bug tree-optimization/20165] New: Pointer does not really escape with write pinskia at gcc dot gnu dot org 2005-02-23 23:29 ` [Bug tree-optimization/20165] " pinskia at gcc dot gnu dot org 2005-03-01 18:12 ` pinskia at gcc dot gnu dot org @ 2005-08-31 15:09 ` dberlin at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: dberlin at gcc dot gnu dot org @ 2005-08-31 15:09 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From dberlin at gcc dot gnu dot org 2005-08-31 15:08 ------- These should simply be marked with pointer_no_escape once that goes in -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20165 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-08-31 15:08 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-02-23 18:21 [Bug tree-optimization/20165] New: Pointer does not really escape with write pinskia at gcc dot gnu dot org 2005-02-23 23:29 ` [Bug tree-optimization/20165] " pinskia at gcc dot gnu dot org 2005-03-01 18:12 ` pinskia at gcc dot gnu dot org 2005-08-31 15:09 ` dberlin at gcc dot gnu dot org
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