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-rw-r--r--mesalib/src/glsl/lower_vector_insert.cpp139
1 files changed, 139 insertions, 0 deletions
diff --git a/mesalib/src/glsl/lower_vector_insert.cpp b/mesalib/src/glsl/lower_vector_insert.cpp
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+++ b/mesalib/src/glsl/lower_vector_insert.cpp
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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"
+
+using namespace ir_builder;
+
+class vector_insert_visitor : public ir_rvalue_visitor {
+public:
+ vector_insert_visitor(bool lower_nonconstant_index)
+ : progress(false), lower_nonconstant_index(lower_nonconstant_index)
+ {
+ factory.instructions = &factory_instructions;
+ }
+
+ virtual ~vector_insert_visitor()
+ {
+ assert(factory_instructions.is_empty());
+ }
+
+ virtual void handle_rvalue(ir_rvalue **rv);
+
+ ir_factory factory;
+ exec_list factory_instructions;
+ bool progress;
+ bool lower_nonconstant_index;
+};
+
+
+void
+vector_insert_visitor::handle_rvalue(ir_rvalue **rv)
+{
+ if (*rv == NULL || (*rv)->ir_type != ir_type_expression)
+ return;
+
+ ir_expression *const expr = (ir_expression *) *rv;
+
+ if (likely(expr->operation != ir_triop_vector_insert))
+ return;
+
+ factory.mem_ctx = ralloc_parent(expr);
+
+ ir_constant *const idx = expr->operands[2]->constant_expression_value();
+ if (idx != NULL) {
+ /* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
+ * a new temporary. The new temporary gets assigned as
+ *
+ * t = vec
+ * t.mask = scalar
+ *
+ * where mask is the component selected by index.
+ */
+ ir_variable *const temp =
+ factory.make_temp(expr->operands[0]->type, "vec_tmp");
+
+ const int mask = 1 << idx->value.i[0];
+
+ factory.emit(assign(temp, expr->operands[0]));
+ factory.emit(assign(temp, expr->operands[1], mask));
+
+ this->progress = true;
+ *rv = new(factory.mem_ctx) ir_dereference_variable(temp);
+ } else if (this->lower_nonconstant_index) {
+ /* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
+ * a new temporary. The new temporary gets assigned as
+ *
+ * t = vec
+ * if (index == 0)
+ * t.x = scalar
+ * if (index == 1)
+ * t.y = scalar
+ * if (index == 2)
+ * t.z = scalar
+ * if (index == 3)
+ * t.w = scalar
+ */
+ ir_variable *const temp =
+ factory.make_temp(expr->operands[0]->type, "vec_tmp");
+
+ ir_variable *const src_temp =
+ factory.make_temp(expr->operands[1]->type, "src_temp");
+
+ factory.emit(assign(temp, expr->operands[0]));
+ factory.emit(assign(src_temp, expr->operands[1]));
+
+ for (unsigned i = 0; i < expr->type->vector_elements; i++) {
+ ir_constant *const cmp_index =
+ new(factory.mem_ctx) ir_constant(int(i));
+
+ ir_variable *const cmp_result =
+ factory.make_temp(glsl_type::bool_type, "index_condition");
+
+ factory.emit(assign(cmp_result,
+ equal(expr->operands[2]->clone(factory.mem_ctx,
+ NULL),
+ cmp_index)));
+
+ factory.emit(if_tree(cmp_result,
+ assign(temp, src_temp, WRITEMASK_X << i)));
+ }
+
+ this->progress = true;
+ *rv = new(factory.mem_ctx) ir_dereference_variable(temp);
+ }
+
+ base_ir->insert_before(factory.instructions);
+}
+
+bool
+lower_vector_insert(exec_list *instructions, bool lower_nonconstant_index)
+{
+ vector_insert_visitor v(lower_nonconstant_index);
+
+ visit_list_elements(&v, instructions);
+
+ return v.progress;
+}