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From: "xinliangli at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/35356] New: Missing Index splitting support in gcc Date: Mon, 25 Feb 2008 04:55:00 -0000 [thread overview] Message-ID: <bug-35356-9436@http.gcc.gnu.org/bugzilla/> (raw) The following cases are not handled by gcc: case 1: Example 28: search loop -- yes it is silly, but exists in real program: for (i = 0; i < n; i++) { if ( i == k) a[i] = ... } Should eliminate the loop and generate: if (k >= 0 && k < n) a[k] = .... case 2: for (i = 0; i < n; i++) { if (i == k) a[i] = 1; else a[i] = i; } Should be converted into: for (i = 0; i < min (n, k); i++) a[i] = i; if (k >= 0 && k < n) a[k] = 1; for (i = max(k+1,0); i < n; i++) a[i] = i; case 3 (similar to case 1): (from art) int winner,numf1s,numf2s, resonant,cp,numpatterns; double **tds; double d, tsum; typedef struct { double y; int reset; } xyz; xyz *Y; int ti; void match() { int tj,tresult; for (tj=0;tj<numf2s;tj++) { if ((tj == winner) &&(Y[tj].y > 0)) tsum += tds[ti][tj] * d; } } -- Summary: Missing Index splitting support in gcc Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: xinliangli at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35356
next reply other threads:[~2008-02-25 4:55 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-02-25 4:55 xinliangli at gmail dot com [this message] 2008-02-25 11:53 ` [Bug tree-optimization/35356] " rguenth at gcc dot gnu dot org 2009-07-21 16:31 ` spop at gcc dot gnu dot org
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