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re PR tree-optimization/79955 (GLIBC build fails after r245840) 

2017-03-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79955
	* tree-ssa-uninit.c (warn_uninitialized_vars): Do not warn
	for accesses that are completely outside of the variable.

	* gcc.dg/uninit-24.c: New testcase.

From-SVN: r245976
This commit is contained in:
Richard Biener 2017-03-08 14:10:47 +00:00 committed by Richard Biener
parent 6659fe59f3
commit edfcd7e3d4
4 changed files with 32 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/79955
* tree-ssa-uninit.c (warn_uninitialized_vars): Do not warn
for accesses that are completely outside of the variable.
2017-03-08 Andrew Haley <aph@redhat.com>
PR tree-optimization/79943

5
gcc/testsuite/ChangeLog
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@ -7,6 +7,11 @@
PR tree-optimization/79943
* gcc.dg/tree-ssa/pr79943.c: New test.
2017-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/79955
* gcc.dg/uninit-24.c: New testcase.
2017-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/79920

10
gcc/testsuite/gcc.dg/uninit-24.c Normal file
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@ -0,0 +1,10 @@
/* { dg-do compile } */
/* { dg-options "-O -Wmaybe-uninitialized" } */
int foo (int x)
{
int y;
if (x)
return *(&y + 1); /* { dg-bogus "may be used uninitialized" } */
return 0;
}

11
gcc/tree-ssa-uninit.c
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@ -287,6 +287,17 @@ warn_uninitialized_vars (bool warn_possibly_uninitialized)
|| TREE_NO_WARNING (base))
continue;
/* Do not warn if the access is fully outside of the
variable. */
if (ref.size != -1
&& ref.max_size == ref.size
&& (ref.offset + ref.size <= 0
|| (ref.offset >= 0
&& TREE_CODE (DECL_SIZE (base)) == INTEGER_CST
&& compare_tree_int (DECL_SIZE (base),
ref.offset) <= 0)))
continue;
/* Limit the walking to a constant number of stmts after
we overcommit quadratic behavior for small functions
and O(n) behavior. */