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/*

 * 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 */