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re PR tree-optimization/56837 (-ftree-loop-distribute-patterns generates incorrect code) 

2013-04-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56837
	* tree-loop-distribution.c (classify_partition): For non-zero
	values require that the value has the same precision as its
	mode to be useful as memset value.

	* g++.dg/torture/pr56837.C: New testcase.

From-SVN: r197476
This commit is contained in:
Richard Biener 2013-04-04 10:55:25 +00:00 committed by Richard Biener
parent 2d50082803
commit f1bf4f3afb
4 changed files with 40 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2013-04-04 Richard Biener <rguenther@suse.de>
PR tree-optimization/56837
* tree-loop-distribution.c (classify_partition): For non-zero
values require that the value has the same precision as its
mode to be useful as memset value.
2013-04-03 Nick Clifton <nickc@redhat.com>
* config/v850/v850e3v5.md (fmasf4): Use fmaf.s on E3V5

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-04-04 Richard Biener <rguenther@suse.de>
PR tree-optimization/56837
* g++.dg/torture/pr56837.C: New testcase.
2013-04-04 Tobias Burnus <burnus@net-b.de>
PR fortran/50269

20
gcc/testsuite/g++.dg/torture/pr56837.C Normal file
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@ -0,0 +1,20 @@
// { dg-do run }
// { dg-options "-ftree-loop-distribute-patterns" }
extern "C" void abort (void);
extern "C" int memcmp (const void *, const void *, __SIZE_TYPE__);
bool b1[8];
bool b2[8] = { true, true, true, true, true, true, true, true };
int main()
{
unsigned int i;
for(i=0 ; i < 8; i++)
b1[i] = true;
if (memcmp (b1, b2, 8) != 0)
abort ();
return 0;
}

12
gcc/tree-loop-distribution.c
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@ -942,13 +942,17 @@ classify_partition (loop_p loop, struct graph *rdg, partition_t partition)
gimple stmt = DR_STMT (single_store);
tree rhs = gimple_assign_rhs1 (stmt);
if (!(integer_zerop (rhs)
|| integer_all_onesp (rhs)
|| real_zerop (rhs)
|| (TREE_CODE (rhs) == CONSTRUCTOR
&& !TREE_CLOBBER_P (rhs))
|| (INTEGRAL_TYPE_P (TREE_TYPE (rhs))
&& (TYPE_MODE (TREE_TYPE (gimple_assign_lhs (stmt)))
== TYPE_MODE (unsigned_char_type_node)))))
|| ((integer_all_onesp (rhs)
|| (INTEGRAL_TYPE_P (TREE_TYPE (rhs))
&& (TYPE_MODE (TREE_TYPE (rhs))
== TYPE_MODE (unsigned_char_type_node))))
/* For stores of a non-zero value require that the precision
of the value matches its actual size. */
&& (TYPE_PRECISION (TREE_TYPE (rhs))
== GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (rhs)))))))
return;
if (TREE_CODE (rhs) == SSA_NAME
&& !SSA_NAME_IS_DEFAULT_DEF (rhs)