From: Dale Weiler <killfieldengine@gmail.com>
Date: Tue, 15 Oct 2013 02:31:37 +0000 (-0400)
Subject: Make divVerent happy about handling divison by zero/inf/nan and negitive versions... 
X-Git-Tag: 0.3.5~26
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=6d8d7ee923a5773456f986bca60c7f5ea96c9d41;p=xonotic%2Fgmqcc.git

Make divVerent happy about handling divison by zero/inf/nan and negitive versions. This code now assumes IEEE 754.
---

diff --git a/fold.c b/fold.c
index ffa0f65..c4b474b 100644
--- a/fold.c
+++ b/fold.c
@@ -209,25 +209,11 @@ static GMQCC_INLINE bool fold_immediate_true(fold_t *fold, ast_value *v) {
                 ((ast_expression*)(X))->vtype != TYPE_FUNCTION)
 
 #define fold_can_2(X, Y) (fold_can_1(X) && fold_can_1(Y))
-#define fold_can_div(X) (fold_immvalue_float(X) != 0.0f)
 
 #define fold_immvalue_float(E)  ((E)->constval.vfloat)
 #define fold_immvalue_vector(E) ((E)->constval.vvec)
 #define fold_immvalue_string(E) ((E)->constval.vstring)
 
-#ifdef INFINITY
-#   define fold_infinity_float  INFINITY
-#else
-#   define fold_infinity_float  (1.0 / 0.0)
-#endif /*! INFINITY */
-
-#define fold_infinity_vector \
-    vec3_create(             \
-        fold_infinity_float, \
-        fold_infinity_float, \
-        fold_infinity_float  \
-    )
-
 fold_t *fold_init(parser_t *parser) {
     fold_t *fold                 = (fold_t*)mem_a(sizeof(fold_t));
     fold->parser                 = parser;
@@ -244,11 +230,9 @@ fold_t *fold_init(parser_t *parser) {
     (void)fold_constgen_float (fold,  0.0f);
     (void)fold_constgen_float (fold,  1.0f);
     (void)fold_constgen_float (fold, -1.0f);
-    (void)fold_constgen_float (fold,  fold_infinity_float); /* +inf */
 
     (void)fold_constgen_vector(fold, vec3_create(0.0f, 0.0f, 0.0f));
     (void)fold_constgen_vector(fold, vec3_create(-1.0f, -1.0f, -1.0f));
-    (void)fold_constgen_vector(fold, fold_infinity_vector); /* +inf */
 
     return fold;
 }
@@ -479,10 +463,7 @@ static GMQCC_INLINE ast_expression *fold_op_mul(fold_t *fold, ast_value *a, ast_
 static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_value *b) {
     if (isfloat(a)) {
         if (fold_can_2(a, b)) {
-            if (fold_can_div(b))
-                return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b));
-            else
-                return (ast_expression*)fold->imm_float[3]; /* inf */
+            return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b));
         } else if (fold_can_1(b)) {
             return (ast_expression*)ast_binary_new(
                 fold_ctx(fold),
@@ -493,12 +474,7 @@ static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_
         }
     } else if (isvector(a)) {
         if (fold_can_2(a, b)) {
-            if (fold_can_div(b)) {
-                return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b)));
-            }
-            else {
-                return (ast_expression*)fold->imm_vector[2]; /* inf */
-            }
+            return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b)));
         } else {
             return (ast_expression*)ast_binary_new(
                 fold_ctx(fold),
@@ -519,13 +495,9 @@ static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_
 }
 
 static GMQCC_INLINE ast_expression *fold_op_mod(fold_t *fold, ast_value *a, ast_value *b) {
-    if (fold_can_2(a, b)) {
-        if (fold_can_div(b))
-            return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) % ((qcint_t)fold_immvalue_float(b))));
-        else
-            return (ast_expression*)fold->imm_float[3]; /* inf */
-    }
-    return NULL;
+    return (fold_can_2(a, b))
+                ? fold_constgen_float(fold, fmod(fold_immvalue_float(a), fold_immvalue_float(b)))
+                : NULL;
 }
 
 static GMQCC_INLINE ast_expression *fold_op_bor(fold_t *fold, ast_value *a, ast_value *b) {