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authorEric Anholt <[email protected]>2010-06-24 15:47:38 -0700
committerEric Anholt <[email protected]>2010-06-24 15:47:40 -0700
commitbcc13b74443137043e8a34f8cb64a5add0d8af93 (patch)
tree5f4e003dceb61c091ce0fcb8c5cf9d91bec033c0 /src/glsl/ir_expression_flattening.cpp
parent84341f4b2014810b2964230384fe76338be1d78e (diff)
parente5cf3aadb8d57dcc70b597092ecac276042f73cb (diff)
Merge branch 'glsl2-head' into glsl2
This brings in the standalone GLSL compiler that we are planning on replacing the existing Mesa GLSL compiler. It currently targets GLSL 1.20 and the Mesa IR.
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diff --git a/src/glsl/ir_expression_flattening.cpp b/src/glsl/ir_expression_flattening.cpp
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+/*
+ * Copyright © 2010 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.
+ */
+
+/**
+ * \file ir_expression_flattening.cpp
+ *
+ * Takes the leaves of expression trees and makes them dereferences of
+ * assignments of the leaves to temporaries, according to a predicate.
+ *
+ * This is used for automatic function inlining, where we want to take
+ * an expression containing a call and move the call out to its own
+ * assignment so that we can inline it at the appropriate place in the
+ * instruction stream.
+ */
+
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_expression_flattening.h"
+#include "glsl_types.h"
+
+class ir_expression_flattening_visitor : public ir_hierarchical_visitor {
+public:
+ ir_expression_flattening_visitor(ir_instruction *base_ir,
+ bool (*predicate)(ir_instruction *ir))
+ {
+ this->base_ir = base_ir;
+ this->predicate = predicate;
+ }
+
+ virtual ~ir_expression_flattening_visitor()
+ {
+ /* empty */
+ }
+
+ virtual ir_visitor_status visit_enter(ir_call *);
+ virtual ir_visitor_status visit_enter(ir_return *);
+ virtual ir_visitor_status visit_enter(ir_function_signature *);
+ virtual ir_visitor_status visit_enter(ir_if *);
+ virtual ir_visitor_status visit_enter(ir_loop *);
+ virtual ir_visitor_status visit_leave(ir_expression *);
+ virtual ir_visitor_status visit_leave(ir_swizzle *);
+
+ bool (*predicate)(ir_instruction *ir);
+ ir_instruction *base_ir;
+};
+
+void
+do_expression_flattening(exec_list *instructions,
+ bool (*predicate)(ir_instruction *ir))
+{
+ foreach_iter(exec_list_iterator, iter, *instructions) {
+ ir_instruction *ir = (ir_instruction *)iter.get();
+
+ ir_expression_flattening_visitor v(ir, predicate);
+ ir->accept(&v);
+ }
+}
+
+
+static ir_rvalue *
+operand_to_temp(ir_instruction *base_ir, ir_rvalue *ir)
+{
+ void *ctx = talloc_parent(base_ir);
+ ir_variable *var;
+ ir_assignment *assign;
+
+ var = new(ctx) ir_variable(ir->type, "flattening_tmp");
+ base_ir->insert_before(var);
+
+ assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
+ ir,
+ NULL);
+ base_ir->insert_before(assign);
+
+ return new(ctx) ir_dereference_variable(var);
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_enter(ir_function_signature *ir)
+{
+ do_expression_flattening(&ir->body, this->predicate);
+
+ return visit_continue_with_parent;
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_enter(ir_loop *ir)
+{
+ do_expression_flattening(&ir->body_instructions, this->predicate);
+
+ return visit_continue_with_parent;
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_enter(ir_if *ir)
+{
+ ir->condition->accept(this);
+
+ do_expression_flattening(&ir->then_instructions, this->predicate);
+ do_expression_flattening(&ir->else_instructions, this->predicate);
+
+ return visit_continue_with_parent;
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_leave(ir_expression *ir)
+{
+ unsigned int operand;
+
+ for (operand = 0; operand < ir->get_num_operands(); operand++) {
+ /* If the operand matches the predicate, then we'll assign its
+ * value to a temporary and deref the temporary as the operand.
+ */
+ if (this->predicate(ir->operands[operand])) {
+ ir->operands[operand] = operand_to_temp(base_ir,
+ ir->operands[operand]);
+ }
+ }
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_leave(ir_swizzle *ir)
+{
+ if (this->predicate(ir->val)) {
+ ir->val = operand_to_temp(this->base_ir, ir->val);
+ }
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_enter(ir_call *ir)
+{
+ /* FINISHME: Why not process the call parameters? (Same behavior as original
+ * FINISHME: code.)
+ */
+ (void) ir;
+ return visit_continue_with_parent;
+}
+
+
+ir_visitor_status
+ir_expression_flattening_visitor::visit_enter(ir_return *ir)
+{
+ /* FINISHME: Why not process the return value? (Same behavior as original
+ * FINISHME: code.)
+ */
+ (void) ir;
+ return visit_continue_with_parent;
+}