+ast_expression *parser_builtin_pow(parser_t *parser) {
+ /*
+ * float __builtin_pow(float x, float y) {
+ * float value = 1.0f;
+ * while (y > 0) {
+ * while (!(y&1)) {
+ * y *= 0.25f;
+ * x *= x;
+ * }
+ * y--;
+ * value *= x;
+ * }
+ * return value;
+ * }
+ */
+ static ast_function *pow_func = NULL;
+ static ast_value *pow_func_val = NULL;
+ if (!pow_func) {
+ ast_value *pow_arguments[2];
+ ast_value *pow_value = ast_value_new (parser_ctx(parser), "value", TYPE_FLOAT);
+ ast_block *pow_body = ast_block_new (parser_ctx(parser));
+ ast_block *pow_loop_body = ast_block_new (parser_ctx(parser));
+ ast_block *pow_loop_nest_body = ast_block_new (parser_ctx(parser));
+ ast_loop *pow_loop = NULL;
+ ast_loop *pow_loop_nest = NULL;
+
+ pow_arguments[0] = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
+ pow_arguments[1] = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
+ pow_func_val = ast_value_new (parser_ctx(parser), "__builtin_pow", TYPE_FUNCTION);
+ pow_func_val->expression.next = (ast_expression*)ast_value_new(parser_ctx(parser), "<float>", TYPE_FLOAT);
+
+ vec_push(pow_func_val->expression.params, pow_arguments[0]);
+ vec_push(pow_func_val->expression.params, pow_arguments[1]);
+
+ pow_func = ast_function_new(parser_ctx(parser), "__builtin_pow", pow_func_val);
+
+ /* float value; */
+ vec_push(pow_body->locals, pow_value);
+ /* value = 1.0f; */
+ vec_push(pow_body->exprs,
+ (ast_expression*)ast_store_new(
+ parser_ctx(parser),
+ INSTR_STORE_F,
+ (ast_expression*)pow_value,
+ (ast_expression*)parser_const_float_1(parser)
+ )
+ );
+
+ /* y >>= 2 */
+ vec_push(pow_loop_nest_body->exprs,
+ (ast_expression*)ast_binstore_new(
+ parser_ctx(parser),
+ INSTR_STORE_F,
+ INSTR_MUL_F,
+ (ast_expression*)pow_arguments[1],
+ (ast_expression*)parser_const_float(parser, 0.25f)
+ )
+ );
+ vec_push(pow_loop_nest_body->exprs,
+ (ast_expression*)ast_binstore_new(
+ parser_ctx(parser),
+ INSTR_STORE_F,
+ INSTR_MUL_F,
+ (ast_expression*)pow_arguments[0],
+ (ast_expression*)pow_arguments[0]
+ )
+ );
+
+ /* while (!(y&1)) */
+ pow_loop_nest = ast_loop_new (
+ parser_ctx(parser),
+ NULL,
+ (ast_expression*)ast_binary_new(
+ parser_ctx(parser),
+ INSTR_AND,
+ (ast_expression*)pow_arguments[1],
+ (ast_expression*)parser_const_float_1(parser)
+ ),
+ true,
+ NULL,
+ false,
+ NULL,
+ (ast_expression*)pow_loop_nest_body
+ );
+
+ vec_push(pow_loop_body->exprs, (ast_expression*)pow_loop_nest);
+ vec_push(pow_loop_body->exprs,
+ (ast_expression*)ast_binstore_new(
+ parser_ctx(parser),
+ INSTR_STORE_F,
+ INSTR_SUB_F,
+ (ast_expression*)pow_arguments[1],
+ (ast_expression*)parser_const_float_1(parser)
+ )
+ );
+ vec_push(pow_loop_body->exprs,
+ (ast_expression*)ast_binstore_new(
+ parser_ctx(parser),
+ INSTR_STORE_F,
+ INSTR_MUL_F,
+ (ast_expression*)pow_value,
+ (ast_expression*)pow_arguments[0]
+ )
+ );
+
+ /* while (y > 0) { */
+ pow_loop = ast_loop_new(
+ parser_ctx(parser),
+ NULL,
+ (ast_expression*)ast_binary_new(
+ parser_ctx(parser),
+ INSTR_GT,
+ (ast_expression*)pow_arguments[1],
+ (ast_expression*)parser_const_float_0(parser)
+ ),
+ false,
+ NULL,
+ false,
+ NULL,
+ (ast_expression*)pow_loop_body
+ );
+ /* } */
+ vec_push(pow_body->exprs, (ast_expression*)pow_loop);
+ /* return value; */
+ vec_push(pow_body->exprs,
+ (ast_expression*)ast_return_new(
+ parser_ctx(parser),
+ (ast_expression*)pow_value
+ )
+ );
+
+ vec_push(pow_func->blocks, pow_body);
+ vec_push(parser->globals, (ast_expression*)pow_func_val);
+ vec_push(parser->functions, pow_func);
+ }
+
+ return (ast_expression*)pow_func_val;
+}
+
+#ifndef M_E
+#define M_E 2.71828182845905
+#endif
+static ast_expression *parser_builtin_exp(parser_t *parser) {
+ /*
+ * float __builtin_exp(float x) {
+ * return __builtin_exp(E, x);
+ * }
+ */
+ static ast_value *exp_func_val = NULL;
+
+ if (!exp_func_val) {
+ ast_function *exp_func = NULL;
+ ast_value *arg = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
+ ast_block *exp_body = ast_block_new (parser_ctx(parser));
+ ast_call *exp_call = ast_call_new (parser_ctx(parser), parser_builtin_pow(parser));
+ exp_func_val = ast_value_new (parser_ctx(parser), "__builtin_exp", TYPE_FUNCTION);
+ exp_func_val->expression.next = (ast_expression*)ast_value_new(parser_ctx(parser), "<float>", TYPE_FLOAT);
+ exp_func = ast_function_new(parser_ctx(parser), "__builtin_exp", exp_func_val);
+
+ vec_push(exp_call->params, (ast_expression*)parser_const_float(parser, M_E));
+ vec_push(exp_call->params, (ast_expression*)arg);
+
+ vec_push(exp_body->exprs,
+ (ast_expression*)ast_return_new(
+ parser_ctx(parser),
+ (ast_expression*)exp_call
+ )
+ );
+
+ vec_push(exp_func_val->expression.params, arg);
+ vec_push(exp_func->blocks, exp_body);
+
+ vec_push(parser->functions, exp_func);
+ vec_push(parser->globals, (ast_expression*)exp_func_val);
+ }
+
+ return (ast_expression*)exp_func_val;
+}
+
+static ast_expression *parser_builtin_mod(parser_t *parser) {
+ /*
+ * float __builtin_mod(float x, float y) {
+ * return x - y * floor(x / y);
+ * }
+ */
+ static ast_value *mod_func_val = NULL;
+ static ast_expression *mod_floor = NULL;
+
+ if (!mod_floor) {
+ if (!(mod_floor = parser_find_global(parser, "floor"))) {
+ parseerror(parser, "internal error: no suitable definition found for `floor` (required for % and __builtin_mod)");
+ return NULL;
+ }
+ }
+
+ if (!mod_func_val) {
+ ast_value *mod_args[2];
+ ast_function *mod_func = NULL;
+ ast_block *mod_body = ast_block_new (parser_ctx(parser));
+ ast_call *mod_call = ast_call_new (parser_ctx(parser), mod_floor);
+ mod_func_val = ast_value_new (parser_ctx(parser), "__builtin_mod", TYPE_FUNCTION);
+ mod_func_val->expression.next = (ast_expression*)ast_value_new(parser_ctx(parser), "<float>", TYPE_FLOAT);
+ mod_func = ast_function_new(parser_ctx(parser), "__builtin_mod", mod_func_val);
+ mod_args[0] = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
+ mod_args[1] = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
+
+ /* floor(x/y) */
+ vec_push(mod_call->params,
+ (ast_expression*)ast_binary_new(
+ parser_ctx(parser),
+ INSTR_DIV_F,
+ (ast_expression*)mod_args[0],
+ (ast_expression*)mod_args[1]
+ )
+ );
+
+ vec_push(mod_body->exprs,
+ (ast_expression*)ast_return_new(
+ parser_ctx(parser),
+ (ast_expression*)ast_binary_new(
+ parser_ctx(parser),
+ INSTR_SUB_F,
+ (ast_expression*)mod_args[0],
+ (ast_expression*)ast_binary_new(
+ parser_ctx(parser),
+ INSTR_MUL_F,
+ (ast_expression*)mod_args[1],
+ (ast_expression*)mod_call
+ )
+ )
+ )
+ );
+
+ vec_push(mod_func_val->expression.params, mod_args[0]);
+ vec_push(mod_func_val->expression.params, mod_args[1]);
+
+ vec_push(mod_func->blocks, mod_body);
+
+ vec_push(parser->functions, mod_func);
+ vec_push(parser->globals, (ast_expression*)mod_func_val);
+ }
+
+ return (ast_expression*)mod_func_val;
+}
+