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glsl/loops: Remove unnecessary list walk from loop_control_visitor.

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When loop_control_visitor::visit_leave(ir_loop *) is analyzing a loop
terminator that acts on a certain ir_variable, it doesn't need to walk
the list of induction variables to find the loop_variable entry
corresponding to the variable.  It can just look it up in the
loop_variable_state hashtable and verify that the loop_variable entry
represents an induction variable.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Paul Berry
2013-11-28 12:44:53 -08:00
parent 115fd75ab0
commit 714e1b331e
2 changed files with 34 additions and 28 deletions
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9
src/glsl/loop_analysis.h
View File

@@ -189,6 +189,15 @@ public:
ir_rvalue *increment;
inline bool is_induction_var() const
{
/* Induction variables always have a non-null increment, and vice
* versa.
*/
return this->increment != NULL;
}
inline bool is_loop_constant() const
{
const bool is_const = (this->num_assignments == 0)

7
src/glsl/loop_controls.cpp
View File

@@ -237,10 +237,8 @@ loop_control_visitor::visit_leave(ir_loop *ir)
ir_rvalue *init = find_initial_value(ir, var);
foreach_list(iv_node, &ls->induction_variables) {
loop_variable *lv = (loop_variable *) iv_node;
if (lv->var == var) {
loop_variable *lv = ls->get(var);
if (lv != NULL && lv->is_induction_var()) {
const int iterations = calculate_iterations(init, limit,
lv->increment,
cmp);
@@ -269,7 +267,6 @@ loop_control_visitor::visit_leave(ir_loop *ir)
break;
}
}
break;
}