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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/45970] New: tree DSE misses many obvious dead stores Date: Mon, 11 Oct 2010 14:40:00 -0000 [thread overview] Message-ID: <bug-45970-4@http.gcc.gnu.org/bugzilla/> (raw) 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.).
next reply other threads:[~2010-10-11 14:40 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-10-11 14:40 jakub at gcc dot gnu.org [this message] 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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