glsl2: Use as_constant some places instead of constant_expression_value

The places where constant_expression_value are still used in loop
analysis are places where a new expression tree is created and
constant folding won't have happened.  This is used, for example, when
we try to determine the maximal loop iteration count.

Based on review comments by Eric.  "...rely on constant folding to
have done its job, instead of going all through the subtree again when
it wasn't a constant."

1 files changed, 2 insertions, 2 deletions

diff --git a/src/glsl/loop_controls.cpp b/src/glsl/loop_controls.cpp
index d6a1e33fdb5..17a0d2db816 100644
--- a/src/glsl/loop_controls.cpp
+++ b/src/glsl/loop_controls.cpp
@@ -204,12 +204,12 @@ loop_control_visitor::visit_leave(ir_loop *ir)
 	  * which.
 	  */
 	 ir_rvalue *counter = cond->operands[0]->as_dereference_variable();
-	 ir_constant *limit = cond->operands[1]->constant_expression_value();
+	 ir_constant *limit = cond->operands[1]->as_constant();
 	 enum ir_expression_operation cmp = cond->operation;
 
 	 if (limit == NULL) {
 	    counter = cond->operands[1]->as_dereference_variable();
-	    limit = cond->operands[0]->constant_expression_value();
+	    limit = cond->operands[0]->as_constant();
 
 	    switch (cmp) {
 	    case ir_binop_less:    cmp = ir_binop_gequal;  break;