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re PR tree-optimization/36339 (not call clobbering variable for non common offset)

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2008-05-28  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36339
	* tree-ssa-alias.c (set_initial_properties): Move pt_anything
	and clobbering code out of the loop.

From-SVN: r136100
This commit is contained in:
Richard Guenther 2008-05-28 14:45:57 +00:00 • committed by Richard Biener
parent 963fc8d00b
commit 38154e4f0f
2 changed files with 25 additions and 13 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2008-05-28 Richard Guenther <rguenther@suse.de>
PR tree-optimization/36339
* tree-ssa-alias.c (set_initial_properties): Move pt_anything
and clobbering code out of the loop.
2008-05-28 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/constraints.md ('b', 'C', 'D', 'e'): New constraint

32
gcc/tree-ssa-alias.c
View file

@ -521,6 +521,8 @@ set_initial_properties (struct alias_info *ai)
referenced_var_iterator rvi;
tree var;
tree ptr;
bool any_pt_anything = false;
enum escape_type pt_anything_mask = 0;
FOR_EACH_REFERENCED_VAR (var, rvi)
{
@ -573,19 +575,8 @@ set_initial_properties (struct alias_info *ai)
}
else if (pi->pt_anything)
{
bitmap_iterator bi;
unsigned int j;
/* If we do not have the points-to set filled out we
still need to honor that this escaped pointer points
to anything. */
EXECUTE_IF_SET_IN_BITMAP (gimple_addressable_vars (cfun),
0, j, bi)
{
tree var = referenced_var (j);
if (!unmodifiable_var_p (var))
mark_call_clobbered (var, pi->escape_mask);
}
any_pt_anything = true;
pt_anything_mask |= pi->escape_mask;
}
}
@ -619,6 +610,21 @@ set_initial_properties (struct alias_info *ai)
MTAG_GLOBAL (tag) = true;
}
}
/* If a pt_anything pointer escaped we need to mark all addressable
variables call clobbered. */
if (any_pt_anything)
{
bitmap_iterator bi;
unsigned int j;
EXECUTE_IF_SET_IN_BITMAP (gimple_addressable_vars (cfun), 0, j, bi)
{
tree var = referenced_var (j);
if (!unmodifiable_var_p (var))
mark_call_clobbered (var, pt_anything_mask);
}
}
}
/* Compute which variables need to be marked call clobbered because