From a5b3faae30e33c00e6e09f0472dd3e0d37c243a3 Mon Sep 17 00:00:00 2001
From: "Wolfgang (Blub) Bumiller" <blub@speed.at>
Date: Tue, 14 Aug 2012 23:43:08 +0200
Subject: [PATCH] const folding for division

---
 parser.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/parser.c b/parser.c
index 9887978..4b09b45 100644
--- a/parser.c
+++ b/parser.c
@@ -608,7 +608,11 @@ static bool parser_sy_pop(parser_t *parser, shunt *sy)
                            type_name[exprs[1]->expression.vtype]);
                 return false;
             }
-            out = (ast_expression*)ast_binary_new(ctx, INSTR_DIV_F, exprs[0], exprs[1]);
+            if (CanConstFold(exprs[0], exprs[1]))
+                out = (ast_expression*)parser_const_float(parser,
+                    asvalue[0]->constval.vfloat / asvalue[1]->constval.vfloat);
+            else
+                out = (ast_expression*)ast_binary_new(ctx, INSTR_DIV_F, exprs[0], exprs[1]);
             break;
         case opid1('%'):
         case opid2('%','='):
-- 
2.39.2