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gmqcc/intrin.h

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/*
* Copyright (C) 2012, 2013
* Dale Weiler
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* Provides all the "intrinsics" / "builtins" for GMQCC. These can do
* a few things, they can provide fall back implementations for math
* functions if the definitions don't exist for some given engine. Or
* then can determine definitions for existing builtins, and simply
* wrap back to them instead. This is like a "portable" intrface that
* is entered when -fintrin is used (causing all existing builtins to
* be ignored by the compiler and instead interface through here.
*/
typedef struct {
ast_expression *(*intrin)(parser_t *);
const char *name;
const char *alias;
} intrin_t;
static ht intrin_intrinsics() {
static ht intrinsics = NULL;
if (!intrinsics)
intrinsics = util_htnew(PARSER_HT_SIZE);
return intrinsics;
}
#define INTRIN_VAL(VALUE, NAME, FUNC, STYPE, VTYPE) \
do { \
(VALUE) = ast_value_new ( \
parser_ctx(parser), \
"__builtin_" NAME, \
TYPE_FUNCTION \
); \
(VALUE)->expression.next = (ast_expression*)ast_value_new ( \
parser_ctx(parser), \
STYPE, \
VTYPE \
); \
(FUNC) = ast_function_new ( \
parser_ctx(parser), \
"__builtin_" NAME, \
(VALUE) \
); \
} while (0)
#define INTRIN_REG(FUNC, VALUE) \
do { \
vec_push(parser->functions, (FUNC)); \
vec_push(parser->globals, (ast_expression*)(VALUE)); \
} while (0)
#define QC_M_E 2.71828182845905
static ast_expression *intrin_func(parser_t *parser, const char *name);
static ast_expression *intrin_pow (parser_t *parser) {
/*
* float pow(float x, float y) {
* float local = 1.0f;
* while (y > 0) {
* while (!(y & 1)) {
* y >>= 2;
* x *= x;
* }
* y--;
* local *= x;
* }
* return local;
* }
*/
static ast_value *value = NULL;
if (!value) {
ast_value *arg1 = ast_value_new(parser_ctx(parser), "x", TYPE_FLOAT);
ast_value *arg2 = ast_value_new(parser_ctx(parser), "y", TYPE_FLOAT);
ast_value *local = ast_value_new(parser_ctx(parser), "local", TYPE_FLOAT);
ast_block *body = ast_block_new(parser_ctx(parser));
ast_block *l1b = ast_block_new(parser_ctx(parser)); /* loop 1 body */
ast_block *l2b = ast_block_new(parser_ctx(parser)); /* looo 2 body */
ast_loop *loop1 = NULL;
ast_loop *loop2 = NULL;
ast_function *func = NULL;
INTRIN_VAL(value, "pow", func, "<float>", TYPE_FLOAT);
/* arguments */
vec_push(value->expression.params, arg1);
vec_push(value->expression.params, arg2);
/* local */
vec_push(body->locals, local);
/* assignment to local of value 1.0f */
vec_push(body->exprs,
(ast_expression*)ast_store_new (
parser_ctx(parser),
INSTR_STORE_F,
(ast_expression*)local,
(ast_expression*)parser_const_float_1(parser)
)
);
/* y >>= 2 */
vec_push(l2b->exprs,
(ast_expression*)ast_binstore_new (
parser_ctx(parser),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)arg2,
(ast_expression*)parser_const_float(parser, 0.25f)
)
);
/* x *= x */
vec_push(l2b->exprs,
(ast_expression*)ast_binstore_new (
parser_ctx(parser),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)arg1,
(ast_expression*)arg1
)
);
/* while (!(y&1)) */
loop2 = ast_loop_new (
parser_ctx(parser),
NULL,
(ast_expression*)ast_binary_new (
parser_ctx(parser),
INSTR_AND,
(ast_expression*)arg2,
(ast_expression*)parser_const_float_1(parser)
),
true, /* ! not */
NULL,
false,
NULL,
(ast_expression*)l2b
);
/* push nested loop into loop expressions */
vec_push(l1b->exprs, (ast_expression*)loop2);
/* y-- */
vec_push(l1b->exprs,
(ast_expression*)ast_binstore_new (
parser_ctx(parser),
INSTR_STORE_F,
INSTR_SUB_F,
(ast_expression*)arg2,
(ast_expression*)parser_const_float_1(parser)
)
);
/* local *= x */
vec_push(l1b->exprs,
(ast_expression*)ast_binstore_new (
parser_ctx(parser),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)local,
(ast_expression*)arg1
)
);
/* while (y > 0) */
loop1 = ast_loop_new (
parser_ctx(parser),
NULL,
(ast_expression*)ast_binary_new (
parser_ctx(parser),
INSTR_GT,
(ast_expression*)arg2,
(ast_expression*)parser_const_float_0(parser)
),
false,
NULL,
false,
NULL,
(ast_expression*)l1b
);
/* push the loop1 into the body for the function */
vec_push(body->exprs, (ast_expression*)loop1);
/* return local; */
vec_push(body->exprs,
(ast_expression*)ast_return_new (
parser_ctx(parser),
(ast_expression*)local
)
);
/* push block and register intrin for codegen */
vec_push(func->blocks, body);
INTRIN_REG(func, value);
}
return (ast_expression*)value;
}
static ast_expression *intrin_mod(parser_t *parser) {
/*
* float mod(float x, float y) {
* return x - y * floor(x / y);
* }
*/
static ast_value *value = NULL;
if (!value) {
ast_call *call = ast_call_new (parser_ctx(parser), intrin_func(parser, "floor"));
ast_value *arg1 = ast_value_new(parser_ctx(parser), "x", TYPE_FLOAT);
ast_value *arg2 = ast_value_new(parser_ctx(parser), "y", TYPE_FLOAT);
ast_block *body = ast_block_new(parser_ctx(parser));
ast_function *func = NULL;
INTRIN_VAL(value, "mod", func, "<float>", TYPE_FLOAT);
/* floor(x/y) */
vec_push(call->params,
(ast_expression*)ast_binary_new (
parser_ctx(parser),
INSTR_DIV_F,
(ast_expression*)arg1,
(ast_expression*)arg2
)
);
vec_push(body->exprs,
(ast_expression*)ast_return_new(
parser_ctx(parser),
(ast_expression*)ast_binary_new(
parser_ctx(parser),
INSTR_SUB_F,
(ast_expression*)arg1,
(ast_expression*)ast_binary_new(
parser_ctx(parser),
INSTR_MUL_F,
(ast_expression*)arg2,
(ast_expression*)call
)
)
)
);
vec_push(value->expression.params, arg1); /* float x (for param) */
vec_push(value->expression.params, arg2); /* float y (for param) */
vec_push(func->blocks, body); /* {{{ body }}} */
INTRIN_REG(func, value);
}
return (ast_expression*)value;
}
static ast_expression *intrin_exp(parser_t *parser) {
/*
* float exp(float x) {
* return pow(QC_M_E, x);
* }
*/
static ast_value *value = NULL;
if (!value) {
ast_call *call = ast_call_new (parser_ctx(parser), intrin_func(parser, "pow"));
ast_value *arg1 = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
ast_block *body = ast_block_new (parser_ctx(parser));
ast_function *func = NULL;
INTRIN_VAL(value, "exp", func, "<float>", TYPE_FLOAT);
/* push arguments for params to call */
vec_push(call->params, (ast_expression*)parser_const_float(parser, QC_M_E));
vec_push(call->params, (ast_expression*)arg1);
/* return pow(QC_M_E, x) */
vec_push(body->exprs,
(ast_expression*)ast_return_new(
parser_ctx(parser),
(ast_expression*)call
)
);
vec_push(value->expression.params, arg1); /* float x (for param) */
vec_push(func->blocks, body); /* {{{ body }}} */
INTRIN_REG(func, value);
}
return (ast_expression*)value;
}
static ast_expression *intrin_isnan(parser_t *parser) {
/*
* float isnan(float x) {
* float local;
* local = x;
*
* return (x != local);
* }
*/
static ast_value *value = NULL;
if (!value) {
ast_value *arg1 = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
ast_value *local = ast_value_new (parser_ctx(parser), "local", TYPE_FLOAT);
ast_block *body = ast_block_new (parser_ctx(parser));
ast_function *func = NULL;
INTRIN_VAL(value, "isnan", func, "<float>", TYPE_FLOAT);
vec_push(body->locals, local);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
parser_ctx(parser),
INSTR_STORE_F,
(ast_expression*)local,
(ast_expression*)arg1
)
);
vec_push(body->exprs,
(ast_expression*)ast_return_new(
parser_ctx(parser),
(ast_expression*)ast_binary_new(
parser_ctx(parser),
INSTR_NE_F,
(ast_expression*)arg1,
(ast_expression*)local
)
)
);
vec_push(value->expression.params, arg1);
vec_push(func->blocks, body);
INTRIN_REG(func, value);
}
return (ast_expression*)value;
}
static intrin_t intrinsics[] = {
{&intrin_exp, "__builtin_exp", "exp"},
{&intrin_mod, "__builtin_mod", "mod"},
{&intrin_pow, "__builtin_pow", "pow"},
{&intrin_isnan, "__builtin_isnan", "isnan"}
};
void intrin_intrinsics_destroy(parser_t *parser) {
/*size_t i;*/
(void)parser;
util_htdel(intrin_intrinsics());
#if 0
for (i = 0; i < sizeof(intrinsics)/sizeof(intrin_t); i++)
ast_value_delete( (ast_value*) intrinsics[i].intrin(parser));
#endif
}
static ast_expression *intrin_func(parser_t *parser, const char *name) {
static bool init = false;
size_t i = 0;
void *find;
/* register the intrinsics in the hashtable for O(1) lookup */
if (!init) {
for (i = 0; i < sizeof(intrinsics)/sizeof(*intrinsics); i++)
util_htset(intrin_intrinsics(), intrinsics[i].alias, &intrinsics[i]);
init = true; /* only once */
}
/*
* jesus fucking christ, Blub design something less fucking
* impossible to use, like a ast_is_builtin(ast_expression *), also
* use a hashtable :P
*/
if ((find = (void*)parser_find_global(parser, name)) && ((ast_value*)find)->expression.vtype == TYPE_FUNCTION)
for (i = 0; i < vec_size(parser->functions); ++i)
if (((ast_value*)find)->name && !strcmp(parser->functions[i]->name, ((ast_value*)find)->name) && parser->functions[i]->builtin < 0)
return (ast_expression*)find;
if ((find = util_htget(intrin_intrinsics(), name))) {
/* intrinsic is in table. This will "generate the function" so
* to speak (if it's not already generated).
*/
return ((intrin_t*)find)->intrin(parser);
}
parseerror(parser, "need function: `%s` compiler depends on it", name);
return NULL;
}
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