[Bug c/32772] New: [4.3 Regression] error: found real variable when subvariables should have appeared

[Bug c/32772] New: [4.3 Regression] error: found real variable when subvariables should have appeared

[bunk at stusta dot de]

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I got the following compile error when trying to compile Linux kernel
2.6.22-rc6-mm1 with a recent gcc SVN snapshot:

$ /usr/local/DIR/gcc-svn20070715/bin/gcc -Wp,-MD,mm/.page_alloc.o.d  -nostdinc
-isystem /usr/local/DIR/gcc-svn20070715/lib/gcc/i686-pc-linux-gnu/4.3.0/include
-D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration -Werror-implicit-function-declaration -Os
-pipe -msoft-float -mregparm=3 -freg-struct-return -mpreferred-stack-boundary=2
 -march=athlon -ffreestanding -maccumulate-outgoing-args -DCONFIG_AS_CFI=1
-DCONFIG_AS_CFI_SIGNAL_FRAME=1 -Iinclude/asm-i386/mach-generic
-Iinclude/asm-i386/mach-default -fno-omit-frame-pointer
-fno-optimize-sibling-calls -fasynchronous-unwind-tables  -fno-stack-protector
-Wdeclaration-after-statement -Wno-pointer-sign    -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(page_alloc)" 
-D"KBUILD_MODNAME=KBUILD_STR(page_alloc)" -c -o mm/page_alloc.o
mm/page_alloc.c: In function ‘__build_all_zonelists’:
mm/page_alloc.c:2381: error: found real variable when subvariables should have
appeared
while verifying SSA_NAME used_mask_87 in statement
# node_2_cpu_mask_468 = VDEF <node_2_cpu_mask_640>
# node_data_469 = VDEF <node_data_644>
# zone_reclaim_mode_470 = VDEF <zone_reclaim_mode_648>
# policy_zone_471 = VDEF <policy_zone_652>
# node_load_472 = VDEF <node_load_656>
# node_order_473 = VDEF <node_order_660>
# used_mask_87 = VDEF <used_mask_564>
# tmp_474 = VDEF <tmp_664>
# SFT.3392_475 = VDEF <SFT.3392_668>
# SFT.3393_476 = VDEF <SFT.3393_672>
# SMT.3398_196 = VDEF <SMT.3398_251>
D.24412_7->node_zonelists[i.600_23].zlcache_ptr = zlc_26;
...


-- 
           Summary: [4.3 Regression] error: found real variable when
                    subvariables should have appeared
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bunk at stusta dot de
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug c/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[bunk at stusta dot de]

------- Comment #1 from bunk at stusta dot de  2007-07-15 23:56 -------
Created an attachment (id=13917)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13917&action=view)
complete error messages


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug c/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[bunk at stusta dot de]

------- Comment #2 from bunk at stusta dot de  2007-07-15 23:59 -------
Created an attachment (id=13918)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13918&action=view)
preprocessed code


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |tree-optimization
           Keywords|                            |ice-on-valid-code
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2007-07-16 10:04 -------
-Os is enough to trigger the problem on x86_64.  (with or without -m32)

Reducing.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2007-07-16 10:17 -------
Created an attachment (id=13919)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13919&action=view)
reduced testcase


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-07-16 10:17 -------
Confirmed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dberlin at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-07-16 10:17:40
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[jakub at gcc dot gnu dot org]

------- Comment #6 from jakub at gcc dot gnu dot org  2007-07-16 14:03 -------
Even shorter testcase:

struct S
{
  unsigned long bits[1];
};

void f1 (int, unsigned long *);
int f2 (void);
int f3 (int, unsigned long *);
int f4 (int, unsigned long *);

static inline __attribute__ ((always_inline))
void baz (int x, volatile struct S *y)
{
  f1 (x, y->bits);
}

static int
bar (int x, struct S *y)
{
  int n;
  if (__builtin_constant_p (x) ? f3 (x, y->bits) : f4 (x, y->bits))
    baz (x, y);
  for (n = f2 (); n < 8; n = f2 ())
    f3 (n, y->bits);
}

void
foo (int x, int y)
{
  struct S m;
  while ((y = bar (x, &m)) >= 0);
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[pinskia at gcc dot gnu dot org]

------- Comment #7 from pinskia at gcc dot gnu dot org  2007-08-04 12:06 -------
I think this is exactly the same as PR 32032, the inliner not setting
has_volatile_ops correctly.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org, hubicka at gcc dot gnu
                   |                            |dot org
  BugsThisDependsOn|                            |32032


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[dberlin at gcc dot gnu dot org]

------- Comment #8 from dberlin at gcc dot gnu dot org  2007-08-19 23:23 -------
Subject: Bug 32772

Author: dberlin
Date: Sun Aug 19 23:23:29 2007
New Revision: 127629

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=127629
Log:
2007-08-19  Daniel Berlin  <dberlin@dberlin.org>

        Fix PR 32772
        Fix PR 32716
        Fix PR 32328
        Fix PR 32303

        * tree-flow.h (struct stmt_ann_d): Remove makes_clobbering_call.
        * tree-ssa-alias.c (init_transitive_clobber_worklist): Add
        on_worklist argument and avoid adding things to worklist multiple
        times.
        (add_to_worklist): Ditto.
        (mark_aliases_call_clobbered): Mark entire structure clobbered if
        single SFT is clobbered.
        (set_initial_properties): Ditto.
        (compute_call_clobbered): Update for changes to function
        arguments.
        (create_overlap_variables_for): Always create SFT for offset 0.
        (create_structure_vars): Handle PHI's, since we are in SSA form at
        this point.
        * tree-ssa-loop-ivopts.c (get_ref_tag): Don't return subvars.
        * tree-ssa-operands.c (access_can_touch_variable): Don't handle
        TARGET_MEM_REF.
        (add_vars_for_offset): Figure out aliases from access + points-to.
        (add_virtual_operand): Use add_vars-for_offset.
        (get_tmr_operands): Update for NMT changes, rewrite to be correct.
        (add_call_clobber_ops): Remove makes_clobbering_call set.
        (get_expr_operands): Always pass through the INDIRECT_REF
        reference.
        * tree-ssa-structalias.c (struct constraint_graph): Remove
        variables member.
        Add pe, pe_rep, pointer_label, loc_label, pointed_by, points_to,
        address_taken, pt_used, number_incoming.
        (FIRST_ADDR_NODE): Removed.
        (merge_graph_nodes): Remove broken code for the moment.
        (init_graph): New function.
        (build_pred_graph): Remove code to init_graph.
        Add location equivalence support.
        (struct scc_info): Rename roots to deleted.
        (scc_visit): Ditto.
        (init_scc_info): Ditto
        (init_topo_info): Use graph->size.
        (compute_topo_order): Ditto.
        (do_da_constraint): Removed.
        (do_sd_constraint): Remove calls to find().
        set_union_with_increment should always get 0 as last arg here.
        (do_complex_constraint): Replace do_da_constraint with assert.
        Stop calling find.
        (struct equiv_class_label): New.
        (pointer_equiv_class_table): Ditto.
        (location_equiv_class_table): Ditto.
        (equiv_class_label_hash): Ditto.
        (equiv_class_label_eq): Ditto
        (equiv_class_lookup): Ditto.
        (equiv_class_ladd): Ditto.
        (pointer_equiv_class): Ditto.
        (location_equiv_class): Ditto.
        (condense_visit): Rename and rewrite from label_visit to do only
        SCC related stuff for HU.
        (label_visit): Do HU work for HU.
        (perform_var_substitution): Update to do HU and location
        equivalence.
        (free_var_substitution_info): Update to free HU and location
        equivalence structures.  */
        (find_equivalent_node): Update for pointer but not location
        equivalence.
        (unite_pointer_equivalences): New function.
        (move_complex_constraints): Rewrite to only do moving.
        (rewrite_constraints): Split out of move_complex_constraints.
        (solve_graph): Use graph->size.
        (process_constraint_1): Add from_call argument, use it.
        Split *a = &b into two constraints.
        (process_constraint): Use new process_constraint_1.
        (get_constraint_for_component_ref): Handle bitmaxsize == -1 case.
        (get_constraint_for): Handle non-pointer integers properly.
        Remove code that used to handle structures.
        (handle_ptr_arith): Fix a few bugs in pointer arithmetic handling
        with unknown addends.
        (handle_rhs_call): New function.
        (find_func_aliases): Use handle_rhs_call.
        (set_uids_in_ptset): Add an assert.
        (set_used_smts): Fix bug in not considering unified vars.
        (compute_tbaa_pruning): Stop initing useless iteration_obstack.
        (compute_points_to_sets): Update for other function changes.
        (delete_points_to_sets): Ditto.
        (ipa_pta_execute): Ditto.
        (pass_ipa_pta): We need to update SSA after ipa_pta.



Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-flow.h
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-loop-ivopts.c
    trunk/gcc/tree-ssa-operands.c
    trunk/gcc/tree-ssa-structalias.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[dberlin at gcc dot gnu dot org]

------- Comment #9 from dberlin at gcc dot gnu dot org  2007-08-20 01:54 -------
All should be fixed


-- 

dberlin at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[rguenth at gcc dot gnu dot org]

------- Comment #10 from rguenth at gcc dot gnu dot org  2007-08-23 12:43 -------
The testcase is not fixed and you didn't add a testcase.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[dberlin at gcc dot gnu dot org]

------- Comment #11 from dberlin at gcc dot gnu dot org  2007-08-23 13:45 -------
It did not fail for me at the point i committed the patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[jakub at gcc dot gnu dot org]

------- Comment #12 from jakub at gcc dot gnu dot org  2007-09-04 06:48 -------
Which testcase is not fixed?

./xgcc -B ./ -Wall -Wundef -m32 -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -Werror-implicit-function-declaration
-Werror-implicit-function-declaration -Os -msoft-float -mregparm=3
-freg-struct-return -mpreferred-stack-boundary=2 -march=athlon -ffreestanding
-maccumulate-outgoing-args -fno-omit-frame-pointer -fno-optimize-sibling-calls
-fasynchronous-unwind-tables  -fno-stack-protector pr32772-1.i -S
In file included from include/asm/thread_info.h:17,
                 from include/linux/thread_info.h:22,
                 from include/linux/preempt.h:10,
                 from include/linux/spinlock.h:50,
                 from include/linux/mmzone.h:8,
                 from include/linux/gfp.h:5,
                 from include/linux/mm.h:9,
                 from mm/page_alloc.c:19:
include/asm/processor.h: In function `cpuid_count':
include/asm/processor.h:622: warning: pointer targets in passing argument 1 of
`__cpuid' differ in signedness
include/asm/processor.h:622: warning: pointer targets in passing argument 2 of
`__cpuid' differ in signedness
include/asm/processor.h:622: warning: pointer targets in passing argument 3 of
`__cpuid' differ in signedness
include/asm/processor.h:622: warning: pointer targets in passing argument 4 of
`__cpuid' differ in signedness

succeeds on the http://gcc.gnu.org/bugzilla/attachment.cgi?id=13918&action=view
testcase, and the http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772#c6 testcase
as well.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[jakub at gcc dot gnu dot org]

------- Comment #13 from jakub at gcc dot gnu dot org  2007-09-04 08:22 -------
The testcases got fixed already by the
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=127491
commit, which is why Daniel wrote
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772#c11
Guess checking in the testcase is desirable anyway.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[pinskia at gcc dot gnu dot org]

------- Comment #14 from pinskia at gcc dot gnu dot org  2007-09-07 00:17 -------
Fixed.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772

[Bug tree-optimization/32772] [4.3 Regression] error: found real variable when subvariables should have appeared

[jakub at gcc dot gnu dot org]

------- Comment #15 from jakub at gcc dot gnu dot org  2007-09-23 09:44 -------
Subject: Bug 32772

Author: jakub
Date: Sun Sep 23 09:44:23 2007
New Revision: 128688

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=128688
Log:
        PR tree-optimization/32772
        * gcc.c-torture/compile/20070905-1.c: New test.

        PR tree-optimization/32975
        * gcc.dg/pr32975.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/20070905-1.c
    trunk/gcc/testsuite/gcc.dg/pr32975.c
Modified:
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32772