src/glsl/nir/nir_builder.h - platform/external/mesa3d - Gitiles

 /*
  * Copyright © 2014-2015 Broadcom
  *
  * 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 (including the next
  * paragraph) 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.
  */

 #ifndef NIR_BUILDER_H
 #define NIR_BUILDER_H

 struct exec_list;

 typedef struct nir_builder {
    struct exec_list *cf_node_list;
    nir_instr *before_instr;
    nir_instr *after_instr;

    nir_shader *shader;
    nir_function_impl *impl;
 } nir_builder;

 static inline void
 nir_builder_init(nir_builder *build, nir_function_impl *impl)
 {
    memset(build, 0, sizeof(*build));
    build->impl = impl;
    build->shader = impl->overload->function->shader;
 }

 static inline void
 nir_builder_insert_after_cf_list(nir_builder *build,
                                  struct exec_list *cf_node_list)
 {
    build->cf_node_list = cf_node_list;
    build->before_instr = NULL;
    build->after_instr = NULL;
 }

 static inline void
 nir_builder_insert_before_instr(nir_builder *build, nir_instr *before_instr)
 {
    build->cf_node_list = NULL;
    build->before_instr = before_instr;
    build->after_instr = NULL;
 }

 static inline void
 nir_builder_insert_after_instr(nir_builder *build, nir_instr *after_instr)
 {
    build->cf_node_list = NULL;
    build->before_instr = NULL;
    build->after_instr = after_instr;
 }

 static inline void
 nir_builder_instr_insert(nir_builder *build, nir_instr *instr)
 {
    if (build->cf_node_list) {
       nir_instr_insert_after_cf_list(build->cf_node_list, instr);
    } else if (build->before_instr) {
       nir_instr_insert_before(build->before_instr, instr);
    } else {
       assert(build->after_instr);
       nir_instr_insert_after(build->after_instr, instr);
       build->after_instr = instr;
    }
 }

 static inline nir_ssa_def *
 nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value)
 {
    nir_load_const_instr *load_const =
       nir_load_const_instr_create(build->shader, num_components);
    if (!load_const)
       return NULL;

    load_const->value = value;

    nir_builder_instr_insert(build, &load_const->instr);

    return &load_const->def;
 }

 static inline nir_ssa_def *
 nir_imm_float(nir_builder *build, float x)
 {
    nir_const_value v = { { .f = {x, 0, 0, 0} } };
    return nir_build_imm(build, 1, v);
 }

 static inline nir_ssa_def *
 nir_imm_vec4(nir_builder *build, float x, float y, float z, float w)
 {
    nir_const_value v = { { .f = {x, y, z, w} } };
    return nir_build_imm(build, 4, v);
 }

 static inline nir_ssa_def *
 nir_imm_int(nir_builder *build, int x)
 {
    nir_const_value v = { { .i = {x, 0, 0, 0} } };
    return nir_build_imm(build, 1, v);
 }

 static inline nir_ssa_def *
 nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
               nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)
 {
    const nir_op_info *op_info = &nir_op_infos[op];
    nir_alu_instr *instr = nir_alu_instr_create(build->shader, op);
    if (!instr)
       return NULL;

    instr->src[0].src = nir_src_for_ssa(src0);
    if (src1)
       instr->src[1].src = nir_src_for_ssa(src1);
    if (src2)
       instr->src[2].src = nir_src_for_ssa(src2);
    if (src3)
       instr->src[3].src = nir_src_for_ssa(src3);

    /* Guess the number of components the destination temporary should have
     * based on our input sizes, if it's not fixed for the op.
     */
    unsigned num_components = op_info->output_size;
    if (num_components == 0) {
       for (unsigned i = 0; i < op_info->num_inputs; i++) {
          if (op_info->input_sizes[i] == 0)
             num_components = MAX2(num_components,
                                   instr->src[i].src.ssa->num_components);
       }
    }
    assert(num_components != 0);

    /* Make sure we don't swizzle from outside of our source vector (like if a
     * scalar value was passed into a multiply with a vector).
     */
    for (unsigned i = 0; i < op_info->num_inputs; i++) {
       for (unsigned j = instr->src[i].src.ssa->num_components; j < 4; j++) {
          instr->src[i].swizzle[j] = instr->src[i].src.ssa->num_components - 1;
       }
    }

    nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
    instr->dest.write_mask = (1 << num_components) - 1;

    nir_builder_instr_insert(build, &instr->instr);

    return &instr->dest.dest.ssa;
 }

 #define ALU1(op)                                                          \
 static inline nir_ssa_def *                                               \
 nir_##op(nir_builder *build, nir_ssa_def *src0)                           \
 {                                                                         \
    return nir_build_alu(build, nir_op_##op, src0, NULL, NULL, NULL);      \
 }

 #define ALU2(op)                                                          \
 static inline nir_ssa_def *                                               \
 nir_##op(nir_builder *build, nir_ssa_def *src0, nir_ssa_def *src1)        \
 {                                                                         \
    return nir_build_alu(build, nir_op_##op, src0, src1, NULL, NULL);      \
 }

 #define ALU3(op)                                                          \
 static inline nir_ssa_def *                                               \
 nir_##op(nir_builder *build, nir_ssa_def *src0,                           \
          nir_ssa_def *src1, nir_ssa_def *src2)                            \
 {                                                                         \
    return nir_build_alu(build, nir_op_##op, src0, src1, src2, NULL);      \
 }

 #define ALU4(op)                                                          \
 static inline nir_ssa_def *                                               \
 nir_##op(nir_builder *build, nir_ssa_def *src0,                           \
          nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)         \
 {                                                                         \
    return nir_build_alu(build, nir_op_##op, src0, src1, src2, src3);      \
 }

 #include "nir_builder_opcodes.h"

 /**
  * Similar to nir_fmov, but takes a nir_alu_src instead of a nir_ssa_def.
  */
 static inline nir_ssa_def *
 nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
 {
    nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_fmov);
    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
    mov->dest.write_mask = (1 << num_components) - 1;
    mov->src[0] = src;
    nir_builder_instr_insert(build, &mov->instr);

    return &mov->dest.dest.ssa;
 }

 static inline nir_ssa_def *
 nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
 {
    nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_imov);
    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
    mov->dest.write_mask = (1 << num_components) - 1;
    mov->src[0] = src;
    nir_builder_instr_insert(build, &mov->instr);

    return &mov->dest.dest.ssa;
 }

 /**
  * Construct an fmov or imov that reswizzles the source's components.
  */
 static inline nir_ssa_def *
 nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
             unsigned num_components, bool use_fmov)
 {
    nir_alu_src alu_src = { NIR_SRC_INIT };
    alu_src.src = nir_src_for_ssa(src);
    for (int i = 0; i < 4; i++)
       alu_src.swizzle[i] = swiz[i];

    return use_fmov ? nir_fmov_alu(build, alu_src, num_components) :
                      nir_imov_alu(build, alu_src, num_components);
 }

 /**
  * Turns a nir_src into a nir_ssa_def * so it can be passed to
  * nir_build_alu()-based builder calls.
  */
 static inline nir_ssa_def *
 nir_ssa_for_src(nir_builder *build, nir_src src, int num_components)
 {
    if (src.is_ssa && src.ssa->num_components == num_components)
       return src.ssa;

    nir_alu_src alu = { NIR_SRC_INIT };
    alu.src = src;
    for (int j = 0; j < 4; j++)
       alu.swizzle[j] = j;

    return nir_imov_alu(build, alu, num_components);
 }

 #endif /* NIR_BUILDER_H */
	/*
	* Copyright © 2014-2015 Broadcom
	*
	* 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 (including the next
	* paragraph) 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.
	*/

	#ifndef NIR_BUILDER_H
	#define NIR_BUILDER_H

	struct exec_list;

	typedef struct nir_builder {
	struct exec_list *cf_node_list;
	nir_instr *before_instr;
	nir_instr *after_instr;

	nir_shader *shader;
	nir_function_impl *impl;
	} nir_builder;

	static inline void
	nir_builder_init(nir_builder build, nir_function_impl impl)
	{
	memset(build, 0, sizeof(*build));
	build->impl = impl;
	build->shader = impl->overload->function->shader;
	}

	static inline void
	nir_builder_insert_after_cf_list(nir_builder *build,
	struct exec_list *cf_node_list)
	{
	build->cf_node_list = cf_node_list;
	build->before_instr = NULL;
	build->after_instr = NULL;
	}

	static inline void
	nir_builder_insert_before_instr(nir_builder build, nir_instr before_instr)
	{
	build->cf_node_list = NULL;
	build->before_instr = before_instr;
	build->after_instr = NULL;
	}

	static inline void
	nir_builder_insert_after_instr(nir_builder build, nir_instr after_instr)
	{
	build->cf_node_list = NULL;
	build->before_instr = NULL;
	build->after_instr = after_instr;
	}

	static inline void
	nir_builder_instr_insert(nir_builder build, nir_instr instr)
	{
	if (build->cf_node_list) {
	nir_instr_insert_after_cf_list(build->cf_node_list, instr);
	} else if (build->before_instr) {
	nir_instr_insert_before(build->before_instr, instr);
	} else {
	assert(build->after_instr);
	nir_instr_insert_after(build->after_instr, instr);
	build->after_instr = instr;
	}
	}

	static inline nir_ssa_def *
	nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value)
	{
	nir_load_const_instr *load_const =
	nir_load_const_instr_create(build->shader, num_components);
	if (!load_const)
	return NULL;

	load_const->value = value;

	nir_builder_instr_insert(build, &load_const->instr);

	return &load_const->def;
	}

	static inline nir_ssa_def *
	nir_imm_float(nir_builder *build, float x)
	{
	nir_const_value v = { { .f = {x, 0, 0, 0} } };
	return nir_build_imm(build, 1, v);
	}

	static inline nir_ssa_def *
	nir_imm_vec4(nir_builder *build, float x, float y, float z, float w)
	{
	nir_const_value v = { { .f = {x, y, z, w} } };
	return nir_build_imm(build, 4, v);
	}

	static inline nir_ssa_def *
	nir_imm_int(nir_builder *build, int x)
	{
	nir_const_value v = { { .i = {x, 0, 0, 0} } };
	return nir_build_imm(build, 1, v);
	}

	static inline nir_ssa_def *
	nir_build_alu(nir_builder build, nir_op op, nir_ssa_def src0,
	nir_ssa_def src1, nir_ssa_def src2, nir_ssa_def *src3)
	{
	const nir_op_info *op_info = &nir_op_infos[op];
	nir_alu_instr *instr = nir_alu_instr_create(build->shader, op);
	if (!instr)
	return NULL;

	instr->src[0].src = nir_src_for_ssa(src0);
	if (src1)
	instr->src[1].src = nir_src_for_ssa(src1);
	if (src2)
	instr->src[2].src = nir_src_for_ssa(src2);
	if (src3)
	instr->src[3].src = nir_src_for_ssa(src3);

	/* Guess the number of components the destination temporary should have
	* based on our input sizes, if it's not fixed for the op.
	*/
	unsigned num_components = op_info->output_size;
	if (num_components == 0) {
	for (unsigned i = 0; i < op_info->num_inputs; i++) {
	if (op_info->input_sizes[i] == 0)
	num_components = MAX2(num_components,
	instr->src[i].src.ssa->num_components);
	}
	}
	assert(num_components != 0);

	/* Make sure we don't swizzle from outside of our source vector (like if a
	* scalar value was passed into a multiply with a vector).
	*/
	for (unsigned i = 0; i < op_info->num_inputs; i++) {
	for (unsigned j = instr->src[i].src.ssa->num_components; j < 4; j++) {
	instr->src[i].swizzle[j] = instr->src[i].src.ssa->num_components - 1;
	}
	}

	nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
	instr->dest.write_mask = (1 << num_components) - 1;

	nir_builder_instr_insert(build, &instr->instr);

	return &instr->dest.dest.ssa;
	}

	#define ALU1(op) \
	static inline nir_ssa_def * \
	nir_##op(nir_builder build, nir_ssa_def src0) \
	{ \
	return nir_build_alu(build, nir_op_##op, src0, NULL, NULL, NULL); \
	}

	#define ALU2(op) \
	static inline nir_ssa_def * \
	nir_##op(nir_builder build, nir_ssa_def src0, nir_ssa_def *src1) \
	{ \
	return nir_build_alu(build, nir_op_##op, src0, src1, NULL, NULL); \
	}

	#define ALU3(op) \
	static inline nir_ssa_def * \
	nir_##op(nir_builder build, nir_ssa_def src0, \
	nir_ssa_def src1, nir_ssa_def src2) \
	{ \
	return nir_build_alu(build, nir_op_##op, src0, src1, src2, NULL); \
	}

	#define ALU4(op) \
	static inline nir_ssa_def * \
	nir_##op(nir_builder build, nir_ssa_def src0, \
	nir_ssa_def src1, nir_ssa_def src2, nir_ssa_def *src3) \
	{ \
	return nir_build_alu(build, nir_op_##op, src0, src1, src2, src3); \
	}

	#include "nir_builder_opcodes.h"

	/**
	* Similar to nir_fmov, but takes a nir_alu_src instead of a nir_ssa_def.
	*/
	static inline nir_ssa_def *
	nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
	{
	nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_fmov);
	nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
	mov->dest.write_mask = (1 << num_components) - 1;
	mov->src[0] = src;
	nir_builder_instr_insert(build, &mov->instr);

	return &mov->dest.dest.ssa;
	}

	static inline nir_ssa_def *
	nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
	{
	nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_imov);
	nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
	mov->dest.write_mask = (1 << num_components) - 1;
	mov->src[0] = src;
	nir_builder_instr_insert(build, &mov->instr);

	return &mov->dest.dest.ssa;
	}

	/**
	* Construct an fmov or imov that reswizzles the source's components.
	*/
	static inline nir_ssa_def *
	nir_swizzle(nir_builder build, nir_ssa_def src, unsigned swiz[4],
	unsigned num_components, bool use_fmov)
	{
	nir_alu_src alu_src = { NIR_SRC_INIT };
	alu_src.src = nir_src_for_ssa(src);
	for (int i = 0; i < 4; i++)
	alu_src.swizzle[i] = swiz[i];

	return use_fmov ? nir_fmov_alu(build, alu_src, num_components) :
	nir_imov_alu(build, alu_src, num_components);
	}

	/**
	* Turns a nir_src into a nir_ssa_def * so it can be passed to
	* nir_build_alu()-based builder calls.
	*/
	static inline nir_ssa_def *
	nir_ssa_for_src(nir_builder *build, nir_src src, int num_components)
	{
	if (src.is_ssa && src.ssa->num_components == num_components)
	return src.ssa;

	nir_alu_src alu = { NIR_SRC_INIT };
	alu.src = src;
	for (int j = 0; j < 4; j++)
	alu.swizzle[j] = j;

	return nir_imov_alu(build, alu, num_components);
	}

	#endif /* NIR_BUILDER_H */