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* [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores @ 2010-10-11 14:40 jakub at gcc dot gnu.org 2010-10-11 14:48 ` [Bug tree-optimization/45970] " rguenth at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: jakub at gcc dot gnu.org @ 2010-10-11 14:40 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45970 Summary: tree DSE misses many obvious dead stores Product: gcc Version: 4.6.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned@gcc.gnu.org ReportedBy: jakub@gcc.gnu.org struct A { char c[4]; } a, b; void f1 (void) { __builtin_memcpy (&a.c[0], "a", 1); a = b; } void f2 (void) { __builtin_memcpy (&a.c[0], "a", 1); __builtin_memcpy (&a.c[0], "cdef", 4); } isn't optimized by tree DSE. RTL DSE can handle it, but only on some targets (there are issues with calls to builtins if they were expanded as calls and args aren't in registers etc.). ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/45970] tree DSE misses many obvious dead stores 2010-10-11 14:40 [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores jakub at gcc dot gnu.org @ 2010-10-11 14:48 ` rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2010-10-11 14:48 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45970 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2010.10.11 14:48:15 AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org |gnu.org | Ever Confirmed|0 |1 Severity|normal |enhancement --- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-11 14:48:15 UTC --- Confirmed, mine. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/45970] tree DSE misses many obvious dead stores 2010-10-11 14:40 [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores jakub at gcc dot gnu.org 2010-10-11 14:48 ` [Bug tree-optimization/45970] " rguenth at gcc dot gnu.org @ 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2010-10-13 13:04 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45970 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.6.0 --- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-13 13:03:58 UTC --- Fixed on trunk. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/45970] tree DSE misses many obvious dead stores 2010-10-11 14:40 [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores jakub at gcc dot gnu.org 2010-10-11 14:48 ` [Bug tree-optimization/45970] " rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org @ 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2010-10-13 13:04 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45970 --- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-13 13:03:37 UTC --- Author: rguenth Date: Wed Oct 13 13:03:31 2010 New Revision: 165422 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165422 Log: 2010-10-13 Richard Guenther <rguenther@suse.de> PR tree-optimization/45970 * tree-ssa-alias.h (stmt_kills_ref_p): Declare. * tree-ssa-alias.c (stmt_kills_ref_p_1): New function. (stmt_kills_ref_p): Likewise. * tree-ssa-dse.c (dse_optimize_stmt): Use it. * gcc.dg/tree-ssa/ssa-dse-13.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-13.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-alias.c trunk/gcc/tree-ssa-alias.h trunk/gcc/tree-ssa-dse.c ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-10-13 13:04 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2010-10-11 14:40 [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores jakub at gcc dot gnu.org 2010-10-11 14:48 ` [Bug tree-optimization/45970] " rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org 2010-10-13 13:04 ` rguenth at gcc dot gnu.org
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