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

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This commit is contained in:
Dale Weiler 2013-10-14 22:31:37 -04:00
parent c8413a9a04
commit 6d8d7ee923
1 changed files with 5 additions and 33 deletions
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34
fold.c
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@ -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 */
} 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 */
}
} 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) {