From: Eric Anholt <eric@anholt.net>
Date: Tue, 6 Apr 2010 18:11:05 +0000 (-0700)
Subject: Perform constant folding on array indices.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=bae5be356eef9efd893e8937d11ecb1b5f3feee6;p=mesa.git

Perform constant folding on array indices.

Replaces a constant var deref with a constant value in CorrectParse1.frag.
---

diff --git a/ir_constant_folding.cpp b/ir_constant_folding.cpp
index b9dee37edfb..006eb5ffcfc 100644
--- a/ir_constant_folding.cpp
+++ b/ir_constant_folding.cpp
@@ -88,7 +88,14 @@ ir_constant_folding_visitor::visit(ir_swizzle *ir)
 void
 ir_constant_folding_visitor::visit(ir_dereference *ir)
 {
-   (void) ir;
+   if (ir->mode == ir_dereference::ir_reference_array) {
+      ir_constant *const_val = ir->selector.array_index->constant_expression_value();
+      if (const_val)
+	 ir->selector.array_index = const_val;
+      else
+	 ir->selector.array_index->accept(this);
+   }
+   ir->var->accept(this);
 }