http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org changed:
What|Removed |Added
Status|UNCONFIRMED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org changed:
What|Removed |Added
Keywords||patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #6 from Richard Biener rguenth at gcc dot gnu.org ---
We have
bb 4:
# iftmp.2_1 = PHI foo(2), bar(3)
_10 = 3;
_34 = g.5_8 != 1;
_35 = _10 != 3;
in .optimized, as fold-all-builtins manages to produce that from
bb 4:
#
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #7 from Richard Biener rguenth at gcc dot gnu.org ---
That is, sth like
Index: gcc/tree-ssa-ter.c
===
--- gcc/tree-ssa-ter.c (revision 204664)
+++ gcc/tree-ssa-ter.c
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #8 from Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org ---
(In reply to Richard Biener from comment #7)
That is, sth like
Index: gcc/tree-ssa-ter.c
===
---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #9 from Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org ---
Author: amylaar
Date: Mon Nov 11 18:57:25 2013
New Revision: 204682
URL: http://gcc.gnu.org/viewcvs?rev=204682root=gccview=rev
Log:
PR middle-end/59049
*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #4 from Andrew Pinski pinskia at gcc dot gnu.org ---
We do have a missed optimization due to fab being done so late.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #1 from Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org ---
Frame 12 shows that at the tree level, one of the comparison operands is an
initialized variable.
(gdb) frame 12
#12 0x083bd9fa in expand_expr_real_1 (exp=ne_expr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org changed:
What|Removed |Added
CC|
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59049
--- Comment #3 from Jorn Wolfgang Rennecke amylaar at gcc dot gnu.org ---
Making emit_store_flag return 0 in the case of const-const comparison
gives simpler rtl generation:
(insn 14 13 15 (set (reg:QI 175)
(const_int 1 [0x1]))
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