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/*
* Copyright 2012 Ecole Normale Superieure
*
* Use of this software is governed by the MIT license
*
* Written by Sven Verdoolaege,
* Ecole Normale Superieure, 45 rue d’Ulm, 75230 Paris, France
*/
#include <string.h>
#include <isl/aff.h>
#include "gpu_print.h"
#include "print.h"
#include "schedule.h"
/* Print declarations to "p" for arrays that are local to "prog"
* but that are used on the host and therefore require a declaration.
*/
__isl_give isl_printer *gpu_print_local_declarations(__isl_take isl_printer *p,
struct gpu_prog *prog)
{
int i;
if (!prog)
return isl_printer_free(p);
for (i = 0; i < prog->n_array; ++i) {
struct gpu_array_info *array = &prog->array[i];
isl_ast_expr *size;
if (!array->declare_local)
continue;
size = array->declared_size;
p = ppcg_print_declaration_with_size(p, array->type, size);
}
return p;
}
/* Print an expression for the size of "array" in bytes.
*/
__isl_give isl_printer *gpu_array_info_print_size(__isl_take isl_printer *prn,
struct gpu_array_info *array)
{
int i;
for (i = 0; i < array->n_index; ++i) {
isl_ast_expr *bound;
prn = isl_printer_print_str(prn, "(");
bound = isl_ast_expr_get_op_arg(array->bound_expr, 1 + i);
prn = isl_printer_print_ast_expr(prn, bound);
isl_ast_expr_free(bound);
prn = isl_printer_print_str(prn, ") * ");
}
prn = isl_printer_print_str(prn, "sizeof(");
prn = isl_printer_print_str(prn, array->type);
prn = isl_printer_print_str(prn, ")");
return prn;
}
/* Print the declaration of a non-linearized array argument.
*/
static __isl_give isl_printer *print_non_linearized_declaration_argument(
__isl_take isl_printer *p, struct gpu_array_info *array)
{
p = isl_printer_print_str(p, array->type);
p = isl_printer_print_str(p, " ");
p = isl_printer_print_ast_expr(p, array->bound_expr);
return p;
}
/* Print the declaration of an array argument.
* "memory_space" allows to specify a memory space prefix.
*/
__isl_give isl_printer *gpu_array_info_print_declaration_argument(
__isl_take isl_printer *p, struct gpu_array_info *array,
const char *memory_space)
{
if (gpu_array_is_read_only_scalar(array)) {
p = isl_printer_print_str(p, array->type);
p = isl_printer_print_str(p, " ");
p = isl_printer_print_str(p, array->name);
return p;
}
if (memory_space) {
p = isl_printer_print_str(p, memory_space);
p = isl_printer_print_str(p, " ");
}
if (array->n_index != 0 && !array->linearize)
return print_non_linearized_declaration_argument(p, array);
p = isl_printer_print_str(p, array->type);
p = isl_printer_print_str(p, " ");
p = isl_printer_print_str(p, "*");
p = isl_printer_print_str(p, array->name);
return p;
}
/* Print the call of an array argument.
*/
__isl_give isl_printer *gpu_array_info_print_call_argument(
__isl_take isl_printer *p, struct gpu_array_info *array)
{
if (gpu_array_is_read_only_scalar(array))
return isl_printer_print_str(p, array->name);
p = isl_printer_print_str(p, "dev_");
p = isl_printer_print_str(p, array->name);
return p;
}
/* Print an access to the element in the private/shared memory copy
* described by "stmt". The index of the copy is recorded in
* stmt->local_index as an access to the array.
*/
static __isl_give isl_printer *stmt_print_local_index(__isl_take isl_printer *p,
struct ppcg_kernel_stmt *stmt)
{
return isl_printer_print_ast_expr(p, stmt->u.c.local_index);
}
/* Print an access to the element in the global memory copy
* described by "stmt". The index of the copy is recorded in
* stmt->index as an access to the array.
*/
static __isl_give isl_printer *stmt_print_global_index(
__isl_take isl_printer *p, struct ppcg_kernel_stmt *stmt)
{
struct gpu_array_info *array = stmt->u.c.array;
isl_ast_expr *index;
if (gpu_array_is_scalar(array)) {
if (!gpu_array_is_read_only_scalar(array))
p = isl_printer_print_str(p, "*");
p = isl_printer_print_str(p, array->name);
return p;
}
index = isl_ast_expr_copy(stmt->u.c.index);
p = isl_printer_print_ast_expr(p, index);
isl_ast_expr_free(index);
return p;
}
/* Print a copy statement.
*
* A read copy statement is printed as
*
* local = global;
*
* while a write copy statement is printed as
*
* global = local;
*/
__isl_give isl_printer *ppcg_kernel_print_copy(__isl_take isl_printer *p,
struct ppcg_kernel_stmt *stmt)
{
p = isl_printer_start_line(p);
if (stmt->u.c.read) {
p = stmt_print_local_index(p, stmt);
p = isl_printer_print_str(p, " = ");
p = stmt_print_global_index(p, stmt);
} else {
p = stmt_print_global_index(p, stmt);
p = isl_printer_print_str(p, " = ");
p = stmt_print_local_index(p, stmt);
}
p = isl_printer_print_str(p, ";");
p = isl_printer_end_line(p);
return p;
}
__isl_give isl_printer *ppcg_kernel_print_domain(__isl_take isl_printer *p,
struct ppcg_kernel_stmt *stmt)
{
return pet_stmt_print_body(stmt->u.d.stmt->stmt, p, stmt->u.d.ref2expr);
}
/* This function is called for each node in a GPU AST.
* In case of a user node, print the macro definitions required
* for printing the AST expressions in the annotation, if any.
* For other nodes, return true such that descendants are also
* visited.
*
* In particular, for a kernel launch, print the macro definitions
* needed for the grid size.
* For a copy statement, print the macro definitions needed
* for the two index expressions.
* For an original user statement, print the macro definitions
* needed for the substitutions.
*/
static isl_bool at_node(__isl_keep isl_ast_node *node, void *user)
{
const char *name;
isl_id *id;
int is_kernel;
struct ppcg_kernel *kernel;
struct ppcg_kernel_stmt *stmt;
isl_printer **p = user;
if (isl_ast_node_get_type(node) != isl_ast_node_user)
return isl_bool_true;
id = isl_ast_node_get_annotation(node);
if (!id)
return isl_bool_false;
name = isl_id_get_name(id);
if (!name)
return isl_bool_error;
is_kernel = !strcmp(name, "kernel");
kernel = is_kernel ? isl_id_get_user(id) : NULL;
stmt = is_kernel ? NULL : isl_id_get_user(id);
isl_id_free(id);
if ((is_kernel && !kernel) || (!is_kernel && !stmt))
return isl_bool_error;
if (is_kernel) {
*p = ppcg_ast_expr_print_macros(kernel->grid_size_expr, *p);
} else if (stmt->type == ppcg_kernel_copy) {
*p = ppcg_ast_expr_print_macros(stmt->u.c.index, *p);
*p = ppcg_ast_expr_print_macros(stmt->u.c.local_index, *p);
} else if (stmt->type == ppcg_kernel_domain) {
*p = ppcg_print_body_macros(*p, stmt->u.d.ref2expr);
}
if (!*p)
return isl_bool_error;
return isl_bool_false;
}
/* Print the required macros for the GPU AST "node" to "p",
* including those needed for the user statements inside the AST.
*/
__isl_give isl_printer *gpu_print_macros(__isl_take isl_printer *p,
__isl_keep isl_ast_node *node)
{
if (isl_ast_node_foreach_descendant_top_down(node, &at_node, &p) < 0)
return isl_printer_free(p);
p = ppcg_print_macros(p, node);
return p;
}
/* Was the definition of "type" printed before?
* That is, does its name appear in the list of printed types "types"?
*/
static int already_printed(struct gpu_types *types,
struct pet_type *type)
{
int i;
for (i = 0; i < types->n; ++i)
if (!strcmp(types->name[i], type->name))
return 1;
return 0;
}
/* Print the definitions of all types prog->scop that have not been
* printed before (according to "types") on "p".
* Extend the list of printed types "types" with the newly printed types.
*/
__isl_give isl_printer *gpu_print_types(__isl_take isl_printer *p,
struct gpu_types *types, struct gpu_prog *prog)
{
int i, n;
isl_ctx *ctx;
char **name;
n = prog->scop->pet->n_type;
if (n == 0)
return p;
ctx = isl_printer_get_ctx(p);
name = isl_realloc_array(ctx, types->name, char *, types->n + n);
if (!name)
return isl_printer_free(p);
types->name = name;
for (i = 0; i < n; ++i) {
struct pet_type *type = prog->scop->pet->types[i];
if (already_printed(types, type))
continue;
p = isl_printer_start_line(p);
p = isl_printer_print_str(p, type->definition);
p = isl_printer_print_str(p, ";");
p = isl_printer_end_line(p);
types->name[types->n++] = strdup(type->name);
}
return p;
}
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