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re PR tree-optimization/81546 (ICE at -O3 during GIMPLE pass dom) 

2017-07-25  Richard Biener  <rguenther@suse.de>

	PR middle-end/81546
	* tree-ssa-operands.c (verify_imm_links): Remove cap on number
	of immediate uses, be more verbose on errors.

From-SVN: r250505
This commit is contained in:
Richard Biener 2017-07-25 11:05:55 +00:00 committed by Richard Biener
parent 5ea71a5a7c
commit 01614e64b3
2 changed files with 39 additions and 12 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-07-25 Richard Biener <rguenther@suse.de>
PR middle-end/81546
* tree-ssa-operands.c (verify_imm_links): Remove cap on number
of immediate uses, be more verbose on errors.
2017-07-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/81510

45
gcc/tree-ssa-operands.c
View File

@ -1139,7 +1139,7 @@ DEBUG_FUNCTION bool
verify_imm_links (FILE *f, tree var)
{
use_operand_p ptr, prev, list;
int count;
unsigned int count;
gcc_assert (TREE_CODE (var) == SSA_NAME);
@ -1157,20 +1157,31 @@ verify_imm_links (FILE *f, tree var)
for (ptr = list->next; ptr != list; )
{
if (prev != ptr->prev)
goto error;
{
fprintf (f, "prev != ptr->prev\n");
goto error;
}
if (ptr->use == NULL)
goto error; /* 2 roots, or SAFE guard node. */
{
fprintf (f, "ptr->use == NULL\n");
goto error; /* 2 roots, or SAFE guard node. */
}
else if (*(ptr->use) != var)
goto error;
{
fprintf (f, "*(ptr->use) != var\n");
goto error;
}
prev = ptr;
ptr = ptr->next;
/* Avoid infinite loops. 50,000,000 uses probably indicates a
problem. */
if (count++ > 50000000)
goto error;
count++;
if (count == 0)
{
fprintf (f, "number of immediate uses doesn't fit unsigned int\n");
goto error;
}
}
/* Verify list in the other direction. */
@ -1178,15 +1189,25 @@ verify_imm_links (FILE *f, tree var)
for (ptr = list->prev; ptr != list; )
{
if (prev != ptr->next)
goto error;
{
fprintf (f, "prev != ptr->next\n");
goto error;
}
prev = ptr;
ptr = ptr->prev;
if (count-- < 0)
goto error;
if (count == 0)
{
fprintf (f, "count-- < 0\n");
goto error;
}
count--;
}
if (count != 0)
goto error;
{
fprintf (f, "count != 0\n");
goto error;
}
return false;