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re PR middle-end/27336 (delete null checks in callers to nonnull functions) 

2016-08-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/27336
	* tree-vrp.c (infer_value_range): Handle stmts that can throw
	by looking for a non-EH edge.
	(process_assert_insertions_for): Likewise.

	* c-c++-common/pr27336.c: New testcase.

From-SVN: r239684
This commit is contained in:
Richard Biener 2016-08-23 07:23:19 +00:00 committed by Richard Biener
parent e83421c08f
commit 1fd9f058f3
4 changed files with 27 additions and 8 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-08-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/27336
* tree-vrp.c (infer_value_range): Handle stmts that can throw
by looking for a non-EH edge.
(process_assert_insertions_for): Likewise.
2016-08-23 Richard Biener <rguenther@suse.de>
PR middle-end/77305

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-08-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/27336
* c-c++-common/pr27336.c: New testcase.
2016-08-22 Marek Polacek <polacek@redhat.com>
PR c++/77321

12
gcc/testsuite/c-c++-common/pr27336.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1" } */
struct B { int x; };
extern void g3(struct B *that) __attribute__((nonnull));
int f3(struct B *a)
{
g3(a);
return a != (void *)0;
}
/* { dg-final { scan-tree-dump "return 1;" "vrp1" } } */

11
gcc/tree-vrp.c
View File

@ -4782,11 +4782,6 @@ infer_value_range (gimple *stmt, tree op, tree_code *comp_code_p, tree *val_p)
if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op))
return false;
/* Similarly, don't infer anything from statements that may throw
exceptions. ??? Relax this requirement? */
if (stmt_could_throw_p (stmt))
return false;
/* If STMT is the last statement of a basic block with no normal
successors, there is no point inferring anything about any of its
operands. We would not be able to find a proper insertion point
@ -4797,7 +4792,7 @@ infer_value_range (gimple *stmt, tree op, tree_code *comp_code_p, tree *val_p)
edge e;
FOR_EACH_EDGE (e, ei, gimple_bb (stmt)->succs)
if (!(e->flags & EDGE_ABNORMAL))
if (!(e->flags & (EDGE_ABNORMAL|EDGE_EH)))
break;
if (e == NULL)
return false;
@ -6370,10 +6365,10 @@ process_assert_insertions_for (tree name, assert_locus *loc)
/* If STMT must be the last statement in BB, we can only insert new
assertions on the non-abnormal edge out of BB. Note that since
STMT is not control flow, there may only be one non-abnormal edge
STMT is not control flow, there may only be one non-abnormal/eh edge
out of BB. */
FOR_EACH_EDGE (e, ei, loc->bb->succs)
if (!(e->flags & EDGE_ABNORMAL))
if (!(e->flags & (EDGE_ABNORMAL|EDGE_EH)))
{
gsi_insert_on_edge (e, assert_stmt);
return true;