http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56286
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog,
| |wrong-code
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2013-02-11
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-02-11
12:55:06 UTC ---
This blocks fixing of tree-ssa-loop-manip.c:find_uses_to_rename
/* ??? If CHANGED_BBS is empty we rewrite the whole function -- why? */
if (changed_bbs && !bitmap_empty_p (changed_bbs))
{
EXECUTE_IF_SET_IN_BITMAP (changed_bbs, 0, index, bi)
which can be a major resource hog. Also relying on that bug is broken,
without checking we can end up generating wrong-code this way.
Incremental betterness can be achieved by
Index: gcc/tree-vect-stmts.c
===================================================================
--- gcc/tree-vect-stmts.c (revision 195938)
+++ gcc/tree-vect-stmts.c (working copy)
@@ -5834,46 +5834,6 @@ vect_transform_stmt (gimple stmt, gimple
}
}
- /* Handle inner-loop stmts whose DEF is used in the loop-nest that
- is being vectorized, but outside the immediately enclosing loop. */
- if (vec_stmt
...
- }
- }
- }
-
/* Handle stmts whose DEF is used outside the loop-nest that is
being vectorized. */
But still
FAIL: gcc.dg/vect/no-scevccp-outer-22.c (internal compiler error)
FAIL: gcc.dg/vect/no-scevccp-outer-22.c (test for excess errors)
WARNING: gcc.dg/vect/no-scevccp-outer-22.c compilation failed to produce
executable
FAIL: gcc.dg/vect/no-scevccp-noreassoc-outer-4.c (internal compiler error)
FAIL: gcc.dg/vect/no-scevccp-noreassoc-outer-4.c (test for excess errors)
WARNING: gcc.dg/vect/no-scevccp-noreassoc-outer-4.c compilation failed to
produce executable
FAIL: gcc.dg/vect/no-scevccp-noreassoc-outer-4.c scan-tree-dump-times vect
"OUTER LOOP VECTORIZED." 1
