From: Wolfgang Bumiller <wry.git@bumiller.com>
Date: Wed, 6 Nov 2013 15:57:04 +0000 (+0100)
Subject: fix 0-x being turned into x
X-Git-Tag: xonotic-v0.8.0~100
X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fgmqcc.git;a=commitdiff_plain;h=de14d514f306f4c7862151d45108a27b2f61abd2;hp=99de3cf4f50124fefcbaa20f1e098fb46e225e56

fix 0-x being turned into x
---

diff --git a/fold.c b/fold.c
index c9f1a06..0128dec 100644
--- a/fold.c
+++ b/fold.c
@@ -799,8 +799,10 @@ static ast_expression *fold_superfluous(ast_expression *left, ast_expression *ri
             break;
 
 
-        case INSTR_ADD_F:
         case INSTR_SUB_F:
+            if (swapped)
+                return NULL;
+        case INSTR_ADD_F:
             if (fold_immvalue_float(load) == 0.0f) {
                 ++opts_optimizationcount[OPTIM_PEEPHOLE];
                 ast_unref(right);
@@ -816,8 +818,10 @@ static ast_expression *fold_superfluous(ast_expression *left, ast_expression *ri
             }
             break;
 
-        case INSTR_ADD_V:
         case INSTR_SUB_V:
+            if (swapped)
+                return NULL;
+        case INSTR_ADD_V:
             if (vec3_cmp(fold_immvalue_vector(load), vec3_create(0, 0, 0))) {
                 ++opts_optimizationcount[OPTIM_PEEPHOLE];
                 ast_unref(right);