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fold-const.c (const_binop): Handle vector shifts by a scalar.

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2013-04-12  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* fold-const.c (const_binop): Handle vector shifts by a scalar.
	(fold_binary_loc): Call const_binop also for mixed vector-scalar
	operations.

gcc/testsuite/
	* gcc.dg/fold-cstvecshift.c: New testcase.

From-SVN: r197843
This commit is contained in:
Marc Glisse 2013-04-12 09:40:37 +02:00 committed by Marc Glisse
parent f3065bdb6e
commit bb50698284
4 changed files with 56 additions and 9 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-04-12 Marc Glisse <marc.glisse@inria.fr>
* fold-const.c (const_binop): Handle vector shifts by a scalar.
(fold_binary_loc): Call const_binop also for mixed vector-scalar
operations.
2013-04-12 Manuel López-Ibáñez <manu@gcc.gnu.org>
Jakub Jelinek <jakub@redhat.com>

42
gcc/fold-const.c
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@ -1342,21 +1342,44 @@ const_binop (enum tree_code code, tree arg1, tree arg2)
if (TREE_CODE (arg1) == VECTOR_CST
&& TREE_CODE (arg2) == VECTOR_CST)
{
tree type = TREE_TYPE(arg1);
tree type = TREE_TYPE (arg1);
int count = TYPE_VECTOR_SUBPARTS (type), i;
tree *elts = XALLOCAVEC (tree, count);
tree *elts = XALLOCAVEC (tree, count);
for (i = 0; i < count; i++)
{
tree elem1 = VECTOR_CST_ELT (arg1, i);
tree elem1 = VECTOR_CST_ELT (arg1, i);
tree elem2 = VECTOR_CST_ELT (arg2, i);
elts[i] = const_binop (code, elem1, elem2);
elts[i] = const_binop (code, elem1, elem2);
/* It is possible that const_binop cannot handle the given
code and return NULL_TREE */
if(elts[i] == NULL_TREE)
return NULL_TREE;
/* It is possible that const_binop cannot handle the given
code and return NULL_TREE */
if (elts[i] == NULL_TREE)
return NULL_TREE;
}
return build_vector (type, elts);
}
/* Shifts allow a scalar offset for a vector. */
if (TREE_CODE (arg1) == VECTOR_CST
&& TREE_CODE (arg2) == INTEGER_CST)
{
tree type = TREE_TYPE (arg1);
int count = TYPE_VECTOR_SUBPARTS (type), i;
tree *elts = XALLOCAVEC (tree, count);
for (i = 0; i < count; i++)
{
tree elem1 = VECTOR_CST_ELT (arg1, i);
elts[i] = const_binop (code, elem1, arg2);
/* It is possible that const_binop cannot handle the given
code and return NULL_TREE */
if (elts[i] == NULL_TREE)
return NULL_TREE;
}
return build_vector (type, elts);
@ -9859,7 +9882,8 @@ fold_binary_loc (location_t loc,
|| (TREE_CODE (arg0) == FIXED_CST && TREE_CODE (arg1) == FIXED_CST)
|| (TREE_CODE (arg0) == FIXED_CST && TREE_CODE (arg1) == INTEGER_CST)
|| (TREE_CODE (arg0) == COMPLEX_CST && TREE_CODE (arg1) == COMPLEX_CST)
|| (TREE_CODE (arg0) == VECTOR_CST && TREE_CODE (arg1) == VECTOR_CST))
|| (TREE_CODE (arg0) == VECTOR_CST && TREE_CODE (arg1) == VECTOR_CST)
|| (TREE_CODE (arg0) == VECTOR_CST && TREE_CODE (arg1) == INTEGER_CST))
{
if (kind == tcc_binary)
{

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2013-04-12 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/fold-cstvecshift.c: New testcase.
2013-04-11 Naveen H.S <Naveen.Hurugalawadi@caviumnetworks.com>
* gcc.target/aarch64/negs.c: New.

13
gcc/testsuite/gcc.dg/fold-cstvecshift.c Normal file
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@ -0,0 +1,13 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-ccp1" } */
typedef int vec __attribute__ ((vector_size (4 * sizeof (int))));
void f (vec *r)
{
vec a = { 2, 3, 4, 5 };
*r = (a << 2) >> 1;
}
/* { dg-final { scan-tree-dump "{ 4, 6, 8, 10 }" "ccp1"} } */
/* { dg-final { cleanup-tree-dump "ccp1" } } */