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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "ir.h"
#include "ir_builder.h"
#include "ir_rvalue_visitor.h"
#include "ir_optimization.h"
#include "main/mtypes.h"
using namespace ir_builder;
namespace {
class vector_deref_visitor : public ir_rvalue_enter_visitor {
public:
vector_deref_visitor()
: progress(false)
{
}
virtual ~vector_deref_visitor()
{
}
virtual void handle_rvalue(ir_rvalue **rv);
virtual ir_visitor_status visit_enter(ir_assignment *ir);
bool progress;
};
} /* anonymous namespace */
ir_visitor_status
vector_deref_visitor::visit_enter(ir_assignment *ir)
{
if (!ir->lhs || ir->lhs->ir_type != ir_type_dereference_array)
return ir_rvalue_enter_visitor::visit_enter(ir);
ir_dereference_array *const deref = (ir_dereference_array *) ir->lhs;
if (!deref->array->type->is_vector())
return ir_rvalue_enter_visitor::visit_enter(ir);
ir_rvalue *const new_lhs = deref->array;
void *mem_ctx = ralloc_parent(ir);
ir_constant *old_index_constant =
deref->array_index->constant_expression_value(mem_ctx);
if (!old_index_constant) {
ir->rhs = new(mem_ctx) ir_expression(ir_triop_vector_insert,
new_lhs->type,
new_lhs->clone(mem_ctx, NULL),
ir->rhs,
deref->array_index);
ir->write_mask = (1 << new_lhs->type->vector_elements) - 1;
ir->set_lhs(new_lhs);
} else if (new_lhs->ir_type != ir_type_swizzle) {
ir->set_lhs(new_lhs);
ir->write_mask = 1 << old_index_constant->get_uint_component(0);
} else {
/* If the "new" LHS is a swizzle, use the set_lhs helper to instead
* swizzle the RHS.
*/
unsigned component[1] = { old_index_constant->get_uint_component(0) };
ir->set_lhs(new(mem_ctx) ir_swizzle(new_lhs, component, 1));
}
return ir_rvalue_enter_visitor::visit_enter(ir);
}
void
vector_deref_visitor::handle_rvalue(ir_rvalue **rv)
{
if (*rv == NULL || (*rv)->ir_type != ir_type_dereference_array)
return;
ir_dereference_array *const deref = (ir_dereference_array *) *rv;
if (!deref->array->type->is_vector())
return;
void *mem_ctx = ralloc_parent(deref);
*rv = new(mem_ctx) ir_expression(ir_binop_vector_extract,
deref->array,
deref->array_index);
}
bool
lower_vector_derefs(gl_linked_shader *shader)
{
vector_deref_visitor v;
visit_list_elements(&v, shader->ir);
return v.progress;
}
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