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More math identities.

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I forgot about 0 for multiplication and division. Detects division by zero.
This commit is contained in:
Bill Currie 2011-01-11 08:49:43 +09:00
parent 5b43fc1de3
commit 4af5dad424
1 changed files with 34 additions and 0 deletions
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34
tools/qfcc/source/constfold.c
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@ -220,8 +220,16 @@ do_op_float (int op, expr_t *e, expr_t *e1, expr_t *e2)
return dec_users (e2);
if (op == '*' && is_constant (e2) && e2->e.float_val == 1)
return dec_users (e1);
if (op == '*' && is_constant (e1) && e1->e.float_val == 0)
return dec_users (e1);
if (op == '*' && is_constant (e2) && e2->e.float_val == 0)
return dec_users (e2);
if (op == '/' && is_constant (e2) && e2->e.float_val == 1)
return dec_users (e1);
if (op == '/' && is_constant (e2) && e2->e.float_val == 0)
return error (e, "division by zero");
if (op == '/' && is_constant (e1) && e1->e.float_val == 0)
return dec_users (e1);
if (op == '+' && is_constant (e1) && e1->e.float_val == 0)
return dec_users (e2);
if (op == '+' && is_constant (e2) && e2->e.float_val == 0)
@ -347,9 +355,18 @@ do_op_vector (int op, expr_t *e, expr_t *e1, expr_t *e2)
if (op == '*' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 1)
return dec_users (e1);
if (op == '*' && is_constant (e1) && e1->type == ex_float
&& e1->e.float_val == 0)
return new_vector_expr (vec3_origin);
if (op == '*' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 0)
return new_vector_expr (vec3_origin);
if (op == '/' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 1)
return dec_users (e1);
if (op == '/' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 0)
return error (e, "division by zero");
if (op == '+' && is_constant (e1) && VectorIsZero (e1->e.vector_val))
return dec_users (e2);
if (op == '+' && is_constant (e2) && VectorIsZero (e2->e.vector_val))
@ -524,9 +541,18 @@ do_op_quaternion (int op, expr_t *e, expr_t *e1, expr_t *e2)
if (op == '*' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 1)
return dec_users (e1);
if (op == '*' && is_constant (e1) && e1->type == ex_float
&& e1->e.float_val == 0)
return new_quaternion_expr (quat_origin);
if (op == '*' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 0)
return new_quaternion_expr (quat_origin);
if (op == '/' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 1)
return dec_users (e1);
if (op == '/' && is_constant (e2) && e2->type == ex_float
&& e2->e.float_val == 0)
return error (e, "division by zero");
if (op == '+' && is_constant (e1) && QuatIsZero (e1->e.quaternion_val))
return dec_users (e2);
if (op == '+' && is_constant (e2) && QuatIsZero (e2->e.quaternion_val))
@ -606,8 +632,16 @@ do_op_integer (int op, expr_t *e, expr_t *e1, expr_t *e2)
return dec_users (e2);
if (op == '*' && is_constant (e2) && e2->e.integer_val == 1)
return dec_users (e1);
if (op == '*' && is_constant (e1) && e1->e.integer_val == 0)
return dec_users (e1);
if (op == '*' && is_constant (e2) && e2->e.integer_val == 0)
return dec_users (e2);
if (op == '/' && is_constant (e2) && e2->e.integer_val == 1)
return dec_users (e1);
if (op == '/' && is_constant (e2) && e2->e.integer_val == 0)
return error (e, "division by zero");
if (op == '/' && is_constant (e1) && e1->e.integer_val == 0)
return dec_users (e1);
if (op == '+' && is_constant (e1) && e1->e.integer_val == 0)
return dec_users (e2);
if (op == '+' && is_constant (e2) && e2->e.integer_val == 0)