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* [Bug middle-end/23401] New: Gimplifier produces too many temporaries @ 2005-08-15 15:18 pinskia at gcc dot gnu dot org 2005-08-15 15:24 ` [Bug middle-end/23401] " pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-15 15:18 UTC (permalink / raw) To: gcc-bugs Take the following code: struct f { struct { int i; } ff[10]; }; struct f g; int ffff(int i) { int t1 = 0; int i1 = g.ff[t1].i; int i2 = g.ff[i].i; return i1 + i2; } The gimplfiier will produce at -O0: int i.0; int t1.1; int D.1289; int t1; int i1; int i2; t1 = 0; i.0 = i; i1 = g.ff[i.0].i; t1.1 = t1; i2 = g.ff[t1.1].i; D.1289 = i1 + i2; return D.1289; Notice how there is a t1.0 and i.0, there should not be there as i and t1 are already gimple variables. This might produce a nice speed up for some testcase but I don't know. at -O0, there will be less registers to be allocated so reload should not be as high as before. -- Summary: Gimplifier produces too many temporaries Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: minor Priority: P2 Component: middle-end 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=23401 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/23401] Gimplifier produces too many temporaries 2005-08-15 15:18 [Bug middle-end/23401] New: Gimplifier produces too many temporaries pinskia at gcc dot gnu dot org @ 2005-08-15 15:24 ` pinskia at gcc dot gnu dot org 2005-08-15 15:25 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-15 15:24 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-15 15:21 ------- For PR 8361, there are about 14 places where this happens. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23401 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/23401] Gimplifier produces too many temporaries 2005-08-15 15:18 [Bug middle-end/23401] New: Gimplifier produces too many temporaries pinskia at gcc dot gnu dot org 2005-08-15 15:24 ` [Bug middle-end/23401] " pinskia at gcc dot gnu dot org @ 2005-08-15 15:25 ` pinskia at gcc dot gnu dot org 2005-08-15 15:45 ` pinskia at gcc dot gnu dot org 2005-08-31 16:05 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-15 15:25 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-15 15:24 ------- In PR15855, there are a lot more, at about 874. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23401 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/23401] Gimplifier produces too many temporaries 2005-08-15 15:18 [Bug middle-end/23401] New: Gimplifier produces too many temporaries pinskia at gcc dot gnu dot org 2005-08-15 15:24 ` [Bug middle-end/23401] " pinskia at gcc dot gnu dot org 2005-08-15 15:25 ` pinskia at gcc dot gnu dot org @ 2005-08-15 15:45 ` pinskia at gcc dot gnu dot org 2005-08-31 16:05 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-15 15:45 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-15 15:43 ------- Hmm, I think this FIXME has something to do with it: /* Gimplify the dimension. Temporary fix for gcc.c-torture/execute/20040313-1.c. Gimplify non-constant array indices into a temporary variable. FIXME - The real fix is to gimplify post-modify expressions into a minimal gimple lvalue. However, that exposes bugs in alias analysis. The alias analyzer does not handle &PTR->FIELD very well. Will fix after the branch is merged into mainline (dnovillo 2004-05-03). */ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23401 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/23401] Gimplifier produces too many temporaries 2005-08-15 15:18 [Bug middle-end/23401] New: Gimplifier produces too many temporaries pinskia at gcc dot gnu dot org ` (2 preceding siblings ...) 2005-08-15 15:45 ` pinskia at gcc dot gnu dot org @ 2005-08-31 16:05 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-08-31 16:05 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-31 16:04 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-08-31 16:04:05 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23401 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2005-08-31 16:04 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-08-15 15:18 [Bug middle-end/23401] New: Gimplifier produces too many temporaries pinskia at gcc dot gnu dot org 2005-08-15 15:24 ` [Bug middle-end/23401] " pinskia at gcc dot gnu dot org 2005-08-15 15:25 ` pinskia at gcc dot gnu dot org 2005-08-15 15:45 ` pinskia at gcc dot gnu dot org 2005-08-31 16:05 ` pinskia at gcc dot gnu dot org
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