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glsl: Do not vectorize vector array dereferences.

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Array dereferences must have scalar indices, so we cannot vectorize
them.

Cc: "10.1" <mesa-stable@lists.freedesktop.org>
Reported-by: Andrew Guertin <lists@dolphinling.net>
Tested-by: Andrew Guertin <lists@dolphinling.net>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2014-02-10 12:09:19 -08:00
parent 4cffd3e791
commit 025d99ce3c
1 changed files with 14 additions and 0 deletions
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14
src/glsl/opt_vectorize.cpp
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@ -82,6 +82,7 @@ public:
virtual ir_visitor_status visit_enter(ir_assignment *);
virtual ir_visitor_status visit_enter(ir_swizzle *);
virtual ir_visitor_status visit_enter(ir_dereference_array *);
virtual ir_visitor_status visit_enter(ir_if *);
virtual ir_visitor_status visit_enter(ir_loop *);
@ -289,6 +290,19 @@ ir_vectorize_visitor::visit_enter(ir_swizzle *ir)
return visit_continue;
}
/* Upon entering an ir_array_dereference, remove the current assignment from
* further consideration. Since the index of an array dereference must scalar,
* we are not able to vectorize it.
*
* FINISHME: If all of scalar indices are identical we could vectorize.
*/
ir_visitor_status
ir_vectorize_visitor::visit_enter(ir_dereference_array *ir)
{
this->current_assignment = NULL;
return visit_continue_with_parent;
}
/* Since there is no statement to visit between the "then" and "else"
* instructions try to vectorize before, in between, and after them to avoid
* combining statements from different basic blocks.