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[Patch] Propagate vector constants into VEC_PERM_EXPR while lowering.
- From: Ramana Radhakrishnan <ramana dot radhakrishnan at linaro dot org>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Cc: Patch Tracking <patches at linaro dot org>
- Date: Thu, 14 Jun 2012 12:26:46 +0100
- Subject: [Patch] Propagate vector constants into VEC_PERM_EXPR while lowering.
Hi,
This patch allows propagation of vector constants into VEC_PERM_EXPRs
in lower_vec_perm, motivation explained in
http://gcc.gnu.org/ml/gcc-patches/2012-06/msg00615.html
Bootstrapped and regression tested on gcc110.fsffrance.org .
Ok ?
regards,
Ramana
* tree-vect-generic.c (lower_vec_perm): Propagate vector constants
into VEC_PERM_EXPR..
diff --git a/gcc/tree-vect-generic.c b/gcc/tree-vect-generic.c
index 06334bb..3b9f561 100644
--- a/gcc/tree-vect-generic.c
+++ b/gcc/tree-vect-generic.c
@@ -628,6 +628,14 @@ lower_vec_perm (gimple_stmt_iterator *gsi)
location_t loc = gimple_location (gsi_stmt (*gsi));
unsigned i;
+ if (TREE_CODE (mask) == SSA_NAME)
+ {
+ gimple def_stmt = SSA_NAME_DEF_STMT (mask);
+ if (is_gimple_assign (def_stmt)
+ && gimple_assign_rhs_code (def_stmt) == VECTOR_CST)
+ mask = gimple_assign_rhs1 (def_stmt);
+ }
+
if (TREE_CODE (mask) == VECTOR_CST)
{
unsigned char *sel_int = XALLOCAVEC (unsigned char, elements);
@@ -637,7 +645,11 @@ lower_vec_perm (gimple_stmt_iterator *gsi)
& (2 * elements - 1));
if (can_vec_perm_p (TYPE_MODE (vect_type), false, sel_int))
- return;
+ {
+ gimple_assign_set_rhs3 (stmt, mask);
+ update_stmt (stmt);
+ return;
+ }
}
else if (can_vec_perm_p (TYPE_MODE (vect_type), true, NULL))
return;