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re PR tree-optimization/69166 (ICE in get_initial_def_for_reduction, at tree-vect-loop.c:4188) 

2016-01-27  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/69166
	* tree-vect-loop.c (vect_is_simple_reduction): Always check
	reduction code for commutativity / associativity.

	* gcc.dg/torture/pr69166.c: New testcase.

From-SVN: r232878
This commit is contained in:
Richard Biener 2016-01-27 14:54:03 +00:00 committed by Richard Biener
parent 1430fb1f56
commit 167c7bfa49
4 changed files with 39 additions and 14 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2016-01-27 Richard Biener <rguenther@suse.de>
PR tree-optimization/69166
* tree-vect-loop.c (vect_is_simple_reduction): Always check
reduction code for commutativity / associativity.
2016-01-27 Martin Jambor <mjambor@suse.cz> 2016-01-27 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/69355 PR tree-optimization/69355

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-01-27 Richard Biener <rguenther@suse.de>
PR tree-optimization/69166
* gcc.dg/torture/pr69166.c: New testcase.
2016-01-27 Martin Jambor <mjambor@suse.cz> 2016-01-27 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/69355 PR tree-optimization/69355

14
gcc/testsuite/gcc.dg/torture/pr69166.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
void fn2(double *e, double a)
{
int b = 0;
for (; b < 256; b++)
{
int c = 0;
double x = e[b];
for (; c < 256; ++c)
x /= a;
e[b] = x;
}
}

16
gcc/tree-vect-loop.c
View File

@ -2750,10 +2750,11 @@ vect_is_simple_reduction (loop_vec_info loop_info, gimple *phi,
&& SSA_NAME_DEF_STMT (op1) == phi) && SSA_NAME_DEF_STMT (op1) == phi)
code = PLUS_EXPR; code = PLUS_EXPR;
if (check_reduction)
{
if (code == COND_EXPR) if (code == COND_EXPR)
{
if (check_reduction)
*v_reduc_type = COND_REDUCTION; *v_reduc_type = COND_REDUCTION;
}
else if (!commutative_tree_code (code) || !associative_tree_code (code)) else if (!commutative_tree_code (code) || !associative_tree_code (code))
{ {
if (dump_enabled_p ()) if (dump_enabled_p ())
@ -2761,7 +2762,6 @@ vect_is_simple_reduction (loop_vec_info loop_info, gimple *phi,
"reduction: not commutative/associative: "); "reduction: not commutative/associative: ");
return NULL; return NULL;
} }
}
if (get_gimple_rhs_class (code) != GIMPLE_BINARY_RHS) if (get_gimple_rhs_class (code) != GIMPLE_BINARY_RHS)
{ {
@ -2856,11 +2856,11 @@ vect_is_simple_reduction (loop_vec_info loop_info, gimple *phi,
and therefore vectorizing reductions in the inner-loop during and therefore vectorizing reductions in the inner-loop during
outer-loop vectorization is safe. */ outer-loop vectorization is safe. */
if (*v_reduc_type != COND_REDUCTION) if (*v_reduc_type != COND_REDUCTION
&& check_reduction)
{ {
/* CHECKME: check for !flag_finite_math_only too? */ /* CHECKME: check for !flag_finite_math_only too? */
if (SCALAR_FLOAT_TYPE_P (type) && !flag_associative_math if (SCALAR_FLOAT_TYPE_P (type) && !flag_associative_math)
&& check_reduction)
{ {
/* Changing the order of operations changes the semantics. */ /* Changing the order of operations changes the semantics. */
if (dump_enabled_p ()) if (dump_enabled_p ())
@ -2868,7 +2868,7 @@ vect_is_simple_reduction (loop_vec_info loop_info, gimple *phi,
"reduction: unsafe fp math optimization: "); "reduction: unsafe fp math optimization: ");
return NULL; return NULL;
} }
else if (INTEGRAL_TYPE_P (type) && check_reduction) else if (INTEGRAL_TYPE_P (type))
{ {
if (!operation_no_trapping_overflow (type, code)) if (!operation_no_trapping_overflow (type, code))
{ {
@ -2891,7 +2891,7 @@ vect_is_simple_reduction (loop_vec_info loop_info, gimple *phi,
return NULL; return NULL;
} }
} }
else if (SAT_FIXED_POINT_TYPE_P (type) && check_reduction) else if (SAT_FIXED_POINT_TYPE_P (type))
{ {
/* Changing the order of operations changes the semantics. */ /* Changing the order of operations changes the semantics. */
if (dump_enabled_p ()) if (dump_enabled_p ())