[Bug debug/42455] [4.5 Regression] -fcompare-debug failure at -O2 in 'recent' builds

[rguenth at gcc dot gnu dot org]

--- Comment #5 from rguenth at gcc dot gnu dot org  2010-01-01 18:43 ---
It's a false positive, the difference is

--- t2.gkd  2010-01-01 19:05:33.0 +0100
+++ t2.gk.gkd   2010-01-01 19:05:33.0 +0100
@@ -45,22 +45,22 @@
 ])# {*movdi_xor_rex64} (expr_list:REG_UNUSED (reg:CC 17 flags)
 (nil)))
 (insn:TI# 0 0 t2.ii:793 (set (mem/s/c:DI (plus:DI (reg/f:DI 7 sp)
-(const_int 64 [0x40])) [5 ISRA.15+0 S8 A128])
+(const_int 64 [0x40])) [5 ISRA.16+0 S8 A128])
 (reg:DI 2 cx [orig:62 D.._M_t._M_impl._M_header ] [62]))#
{*movdi_1
_rex64} (nil))

and similar others.  Thus we create a temporary variable name which
includes a UID which comes from gimplify.c:create_tmp_var_name.

The extra temporary comes from extra early SRA we do when building
with -g:

-! Disqualifying iter - No scalar replacements to be created.
-Marking D.3480 offset: 0, size: 8:  to be replaced.
+Candidate (3488): D.3488
+Marking D.3477 offset: 0, size: 8:  to be replaced.

-Access trees for D.3480 (UID: 3480): 
-access { base = (3480)'D.3480', offset = 0, size = 8, expr = D.3480._M_node,
ty
pe = bool, grp_write = 1, grp_read = 1, grp_hint = 0, grp_covered = 1,
grp_unsca
larizable_region = 0, grp_unscalarized_data = 0, grp_partial_lhs = 0,
grp_differ
ent_types = 1, grp_to_be_replaced = 1, grp_maybe_modified = 0,
grp_not_necessari
lly_dereferenced = 0
+Access trees for D.3477 (UID: 3477): 
+access { base = (3477)'D.3477', offset = 0, size = 8, expr = D.3477._M_node,
ty
pe = bool, grp_write = 1, grp_read = 1, grp_hint = 0, grp_covered = 1,
grp_unsca
larizable_region = 0, grp_unscalarized_data = 0, grp_partial_lhs = 0,
grp_differ
ent_types = 0, grp_to_be_replaced = 1, grp_maybe_modified = 0,
grp_not_necessari
lly_dereferenced = 0
+
+Marking iter offset: 0, size: 8:  to be replaced.
+
+Access trees for iter (UID: 3262): 
+access { base = (3262)'iter', offset = 0, size = 8, expr = iter._M_node, type
=
 bool, grp_write = 1, grp_read = 1, grp_hint = 0, grp_covered = 1,
grp_unscalari
zable_region = 0, grp_unscalarized_data = 0, grp_partial_lhs = 0,
grp_different_
types = 0, grp_to_be_replaced = 1, grp_maybe_modified = 0,
grp_not_necessarilly_
dereferenced = 0


I am testing a patch.  But in reality it will paper over a problem in SRA
that causes code-generation differences dependent on oder of analyzing
accesses.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 CC||jamborm at gcc dot gnu dot
   ||org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42455

[Bug debug/42455] [4.5 Regression] -fcompare-debug failure at -O2 in 'recent' builds

[rguenth at gcc dot gnu dot org]

--- Comment #6 from rguenth at gcc dot gnu dot org  2010-01-01 20:22 ---
Subject: Bug 42455

Author: rguenth
Date: Fri Jan  1 20:22:17 2010
New Revision: 19

URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=19
Log:
2010-01-01  Richard Guenther  rguent...@suse.de

PR debug/42455
* tree-sra.c (analyze_all_variable_accesses): Work in DECL_UID
order.

Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-sra.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42455

[Bug debug/42455] [4.5 Regression] -fcompare-debug failure at -O2 in 'recent' builds

[rguenth at gcc dot gnu dot org]

--- Comment #7 from rguenth at gcc dot gnu dot org  2010-01-01 20:22 ---
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 Status|ASSIGNED|RESOLVED
 Resolution||FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42455

[Bug debug/42455] [4.5 Regression] -fcompare-debug failure at -O2 in 'recent' builds

[rguenth at gcc dot gnu dot org]

--- Comment #4 from rguenth at gcc dot gnu dot org  2009-12-30 20:57 ---
I'll have a look.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
   |dot org |org
 Status|NEW |ASSIGNED
   Last reconfirmed|2009-12-22 01:52:36 |2009-12-30 20:57:19
   date||
Summary|-fcompare-debug failure at|[4.5 Regression] -fcompare-
   |-O2 in 'recent' builds  |debug failure at -O2 in
   ||'recent' builds
   Target Milestone|--- |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42455