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[PATCH] Don't optimize { x, x + 1, x + 2, x + 3 } ctors if there is no vector addition optab (PR middle-end/59273)
- From: Jakub Jelinek <jakub at redhat dot com>
- To: Richard Biener <rguenther at suse dot de>, Uros Bizjak <ubizjak at gmail dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 26 Nov 2013 21:16:37 +0100
- Subject: [PATCH] Don't optimize { x, x + 1, x + 2, x + 3 } ctors if there is no vector addition optab (PR middle-end/59273)
- Authentication-results: sourceware.org; auth=none
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
Hi!
Uros has reported my optimize_vector_constructor optimization causes
problems on Alpha which for some vector modes supports only moves, but not
arithmetics. The following patch fixed that in a cross compiler,
and has been bootstrapped/regtested on x86_64-linux and i686-linux.
Ok for trunk?
2013-11-26 Jakub Jelinek <jakub@redhat.com>
PR middle-end/59273
* tree-vect-generic.c (optimize_vector_constructor): Don't optimize
if there isn't optab handler for the corresponding vector PLUS_EXPR.
--- gcc/tree-vect-generic.c.jj 2013-11-22 21:03:16.000000000 +0100
+++ gcc/tree-vect-generic.c 2013-11-26 08:53:11.117052615 +0100
@@ -1015,9 +1015,14 @@ optimize_vector_constructor (gimple_stmt
tree *cst;
gimple g;
tree base = NULL_TREE;
+ optab op;
if (nelts <= 2 || CONSTRUCTOR_NELTS (rhs) != nelts)
return;
+ op = optab_for_tree_code (PLUS_EXPR, type, optab_default);
+ if (op == unknown_optab
+ || optab_handler (op, TYPE_MODE (type)) == CODE_FOR_nothing)
+ return;
FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (rhs), i, elt)
if (TREE_CODE (elt->value) != SSA_NAME
|| TREE_CODE (TREE_TYPE (elt->value)) == VECTOR_TYPE)
Jakub