From: Ian Romanick <ian.d.romanick@intel.com>
Date: Thu, 26 Aug 2010 22:49:33 +0000 (-0700)
Subject: ir_to_mesa: Handle loops with loop controls set
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0f4f8c73644a9cc436500d605413207c44cfb4ee;p=mesa.git

ir_to_mesa: Handle loops with loop controls set

The downside of our talloc usage is that we can't really make static
(i.e., not created with new) instances of our IR types.  This leads to
a lot of unnecessary dynamic allocation in this patch.
---

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index f0e14b8ece3..839d6f04673 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -882,13 +882,53 @@ ir_to_mesa_visitor::visit(ir_variable *ir)
 void
 ir_to_mesa_visitor::visit(ir_loop *ir)
 {
-   assert(!ir->from);
-   assert(!ir->to);
-   assert(!ir->increment);
-   assert(!ir->counter);
+   ir_dereference_variable *counter = NULL;
+
+   if (ir->counter != NULL)
+      counter = new(ir) ir_dereference_variable(ir->counter);
+
+   if (ir->from != NULL) {
+      assert(ir->counter != NULL);
+
+      ir_assignment *a = new(ir) ir_assignment(counter, ir->from, NULL);
+
+      a->accept(this);
+      delete a;
+   }
 
    ir_to_mesa_emit_op0(NULL, OPCODE_BGNLOOP);
+
+   if (ir->to) {
+      ir_expression *e =
+	 new(ir) ir_expression(ir->cmp, glsl_type::bool_type,
+			       counter, ir->to);
+      ir_if *if_stmt =  new(ir) ir_if(e);
+
+      ir_loop_jump *brk = new(ir) ir_loop_jump(ir_loop_jump::jump_break);
+
+      if_stmt->then_instructions.push_tail(brk);
+
+      if_stmt->accept(this);
+
+      delete if_stmt;
+      delete e;
+      delete brk;
+   }
+
    visit_exec_list(&ir->body_instructions, this);
+
+   if (ir->increment) {
+      ir_expression *e =
+	 new(ir) ir_expression(ir_binop_add, counter->type,
+			       counter, ir->increment);
+
+      ir_assignment *a = new(ir) ir_assignment(counter, e, NULL);
+
+      a->accept(this);
+      delete a;
+      delete e;
+   }
+
    ir_to_mesa_emit_op0(NULL, OPCODE_ENDLOOP);
 }