src/compiler/nir/nir_opt_non_uniform_access.c - third_party/mesa - Git at Google

 /*
  * Copyright © 2022 Collabora Ltd.
  *
  * 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.
  */

 #include "nir.h"
 #include "nir_builder.h"

 static bool
 is_ubo_intrinsic(nir_intrinsic_instr *intrin)
 {
    return intrin->intrinsic == nir_intrinsic_load_ubo;
 }

 static bool
 is_ssbo_intrinsic(nir_intrinsic_instr *intrin)
 {
    switch (intrin->intrinsic) {
    case nir_intrinsic_load_ssbo:
    case nir_intrinsic_store_ssbo:
    case nir_intrinsic_ssbo_atomic_add:
    case nir_intrinsic_ssbo_atomic_imin:
    case nir_intrinsic_ssbo_atomic_umin:
    case nir_intrinsic_ssbo_atomic_imax:
    case nir_intrinsic_ssbo_atomic_umax:
    case nir_intrinsic_ssbo_atomic_and:
    case nir_intrinsic_ssbo_atomic_or:
    case nir_intrinsic_ssbo_atomic_xor:
    case nir_intrinsic_ssbo_atomic_exchange:
    case nir_intrinsic_ssbo_atomic_comp_swap:
    case nir_intrinsic_ssbo_atomic_fadd:
    case nir_intrinsic_ssbo_atomic_fmin:
    case nir_intrinsic_ssbo_atomic_fmax:
    case nir_intrinsic_ssbo_atomic_fcomp_swap:
       return true;

    default:
       return false;
    }
 }

 static bool
 is_image_intrinsic(nir_intrinsic_instr *intrin)
 {
    switch (intrin->intrinsic) {
    case nir_intrinsic_image_load:
    case nir_intrinsic_image_sparse_load:
    case nir_intrinsic_image_store:
    case nir_intrinsic_image_atomic_add:
    case nir_intrinsic_image_atomic_imin:
    case nir_intrinsic_image_atomic_umin:
    case nir_intrinsic_image_atomic_imax:
    case nir_intrinsic_image_atomic_umax:
    case nir_intrinsic_image_atomic_and:
    case nir_intrinsic_image_atomic_or:
    case nir_intrinsic_image_atomic_xor:
    case nir_intrinsic_image_atomic_exchange:
    case nir_intrinsic_image_atomic_comp_swap:
    case nir_intrinsic_image_atomic_fadd:
    case nir_intrinsic_image_atomic_fmin:
    case nir_intrinsic_image_atomic_fmax:
    case nir_intrinsic_image_size:
    case nir_intrinsic_image_samples:
    case nir_intrinsic_bindless_image_load:
    case nir_intrinsic_bindless_image_sparse_load:
    case nir_intrinsic_bindless_image_store:
    case nir_intrinsic_bindless_image_atomic_add:
    case nir_intrinsic_bindless_image_atomic_imin:
    case nir_intrinsic_bindless_image_atomic_umin:
    case nir_intrinsic_bindless_image_atomic_imax:
    case nir_intrinsic_bindless_image_atomic_umax:
    case nir_intrinsic_bindless_image_atomic_and:
    case nir_intrinsic_bindless_image_atomic_or:
    case nir_intrinsic_bindless_image_atomic_xor:
    case nir_intrinsic_bindless_image_atomic_exchange:
    case nir_intrinsic_bindless_image_atomic_comp_swap:
    case nir_intrinsic_bindless_image_atomic_fadd:
    case nir_intrinsic_bindless_image_atomic_fmin:
    case nir_intrinsic_bindless_image_atomic_fmax:
    case nir_intrinsic_bindless_image_size:
    case nir_intrinsic_bindless_image_samples:
    case nir_intrinsic_image_deref_load:
    case nir_intrinsic_image_deref_sparse_load:
    case nir_intrinsic_image_deref_store:
    case nir_intrinsic_image_deref_atomic_add:
    case nir_intrinsic_image_deref_atomic_umin:
    case nir_intrinsic_image_deref_atomic_imin:
    case nir_intrinsic_image_deref_atomic_umax:
    case nir_intrinsic_image_deref_atomic_imax:
    case nir_intrinsic_image_deref_atomic_and:
    case nir_intrinsic_image_deref_atomic_or:
    case nir_intrinsic_image_deref_atomic_xor:
    case nir_intrinsic_image_deref_atomic_exchange:
    case nir_intrinsic_image_deref_atomic_comp_swap:
    case nir_intrinsic_image_deref_atomic_fadd:
    case nir_intrinsic_image_deref_atomic_fmin:
    case nir_intrinsic_image_deref_atomic_fmax:
    case nir_intrinsic_image_deref_size:
    case nir_intrinsic_image_deref_samples:
       return true;

    default:
       return false;
    }
 }

 static bool
 has_non_uniform_tex_access(nir_tex_instr *tex)
 {
    return tex->texture_non_uniform || tex->sampler_non_uniform;
 }

 static bool
 has_non_uniform_access_intrin(nir_intrinsic_instr *intrin)
 {
    return (nir_intrinsic_access(intrin) & ACCESS_NON_UNIFORM) != 0;
 }

 static bool
 nir_has_non_uniform_access_impl(nir_function_impl *impl, enum nir_lower_non_uniform_access_type types)
 {
    nir_foreach_block_safe(block, impl) {
       nir_foreach_instr_safe(instr, block) {
          switch (instr->type) {
          case nir_instr_type_tex: {
             nir_tex_instr *tex = nir_instr_as_tex(instr);
             if ((types & nir_lower_non_uniform_texture_access) &&
                  has_non_uniform_tex_access(tex))
                return true;
             break;
          }

          case nir_instr_type_intrinsic: {
             nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
             if (is_ubo_intrinsic(intrin)) {
                if ((types & nir_lower_non_uniform_ubo_access) &&
                     has_non_uniform_access_intrin(intrin))
                   return true;
             } else if (is_ssbo_intrinsic(intrin)) {
                if ((types & nir_lower_non_uniform_ssbo_access) &&
                     has_non_uniform_access_intrin(intrin))
                   return true;
             } else if (is_image_intrinsic(intrin)) {
                if ((types & nir_lower_non_uniform_image_access) &&
                     has_non_uniform_access_intrin(intrin))
                   return true;
             } else {
                /* Nothing to do */
             }
             break;
          }

          default:
             /* Nothing to do */
             break;
          }
       }
    }

    return false;
 }

 bool
 nir_has_non_uniform_access(nir_shader *shader, enum nir_lower_non_uniform_access_type types)
 {
    nir_foreach_function(function, shader) {
       if (function->impl && nir_has_non_uniform_access_impl(function->impl, types))
          return true;
    }

    return false;
 }

 static bool
 opt_non_uniform_tex_access(nir_tex_instr *tex)
 {
    if (!has_non_uniform_tex_access(tex))
       return false;

    bool progress = false;

    for (unsigned i = 0; i < tex->num_srcs; i++) {
       switch (tex->src[i].src_type) {
       case nir_tex_src_texture_offset:
       case nir_tex_src_texture_handle:
       case nir_tex_src_texture_deref:
          if (tex->texture_non_uniform && !tex->src[i].src.ssa->divergent) {
             tex->texture_non_uniform = false;
             progress = true;
          }
          break;

       case nir_tex_src_sampler_offset:
       case nir_tex_src_sampler_handle:
       case nir_tex_src_sampler_deref:
          if (tex->sampler_non_uniform && !tex->src[i].src.ssa->divergent) {
             tex->sampler_non_uniform = false;
             progress = true;
          }
          break;

       default:
          break;
       }
    }

    return progress;
 }

 static bool
 opt_non_uniform_access_intrin(nir_intrinsic_instr *intrin, unsigned handle_src)
 {
    if (!has_non_uniform_access_intrin(intrin))
       return false;

    if (intrin->src[handle_src].ssa->divergent)
       return false;

    nir_intrinsic_set_access(intrin, nir_intrinsic_access(intrin) & ~ACCESS_NON_UNIFORM);

    return true;
 }

 static bool
 nir_opt_non_uniform_access_instr(nir_builder *b, nir_instr *instr, UNUSED void *user_data)
 {
    switch (instr->type) {
    case nir_instr_type_tex:
       return opt_non_uniform_tex_access(nir_instr_as_tex(instr));

    case nir_instr_type_intrinsic: {
       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
       if (is_ubo_intrinsic(intrin) || is_ssbo_intrinsic(intrin) || is_image_intrinsic(intrin)) {
          unsigned handle_src = 0;
          /* SSBO Stores put the index in the second source */
          if (intrin->intrinsic == nir_intrinsic_store_ssbo)
             handle_src = 1;
          return opt_non_uniform_access_intrin(intrin, handle_src);
       }
       break;
    }

    default:
       /* Nothing to do */
       break;
    }

    return false;
 }

 bool
 nir_opt_non_uniform_access(nir_shader *shader)
 {
    NIR_PASS(_, shader, nir_convert_to_lcssa, true, true);
    nir_divergence_analysis(shader);

    bool progress = nir_shader_instructions_pass(shader,
                                                 nir_opt_non_uniform_access_instr,
                                                 nir_metadata_all, NULL);

    NIR_PASS(_, shader, nir_opt_remove_phis); /* cleanup LCSSA phis */

    return progress;
 }
	/*
	* Copyright © 2022 Collabora Ltd.
	*
	* 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.
	*/

	#include "nir.h"
	#include "nir_builder.h"

	static bool
	is_ubo_intrinsic(nir_intrinsic_instr *intrin)
	{
	return intrin->intrinsic == nir_intrinsic_load_ubo;
	}

	static bool
	is_ssbo_intrinsic(nir_intrinsic_instr *intrin)
	{
	switch (intrin->intrinsic) {
	case nir_intrinsic_load_ssbo:
	case nir_intrinsic_store_ssbo:
	case nir_intrinsic_ssbo_atomic_add:
	case nir_intrinsic_ssbo_atomic_imin:
	case nir_intrinsic_ssbo_atomic_umin:
	case nir_intrinsic_ssbo_atomic_imax:
	case nir_intrinsic_ssbo_atomic_umax:
	case nir_intrinsic_ssbo_atomic_and:
	case nir_intrinsic_ssbo_atomic_or:
	case nir_intrinsic_ssbo_atomic_xor:
	case nir_intrinsic_ssbo_atomic_exchange:
	case nir_intrinsic_ssbo_atomic_comp_swap:
	case nir_intrinsic_ssbo_atomic_fadd:
	case nir_intrinsic_ssbo_atomic_fmin:
	case nir_intrinsic_ssbo_atomic_fmax:
	case nir_intrinsic_ssbo_atomic_fcomp_swap:
	return true;

	default:
	return false;
	}
	}

	static bool
	is_image_intrinsic(nir_intrinsic_instr *intrin)
	{
	switch (intrin->intrinsic) {
	case nir_intrinsic_image_load:
	case nir_intrinsic_image_sparse_load:
	case nir_intrinsic_image_store:
	case nir_intrinsic_image_atomic_add:
	case nir_intrinsic_image_atomic_imin:
	case nir_intrinsic_image_atomic_umin:
	case nir_intrinsic_image_atomic_imax:
	case nir_intrinsic_image_atomic_umax:
	case nir_intrinsic_image_atomic_and:
	case nir_intrinsic_image_atomic_or:
	case nir_intrinsic_image_atomic_xor:
	case nir_intrinsic_image_atomic_exchange:
	case nir_intrinsic_image_atomic_comp_swap:
	case nir_intrinsic_image_atomic_fadd:
	case nir_intrinsic_image_atomic_fmin:
	case nir_intrinsic_image_atomic_fmax:
	case nir_intrinsic_image_size:
	case nir_intrinsic_image_samples:
	case nir_intrinsic_bindless_image_load:
	case nir_intrinsic_bindless_image_sparse_load:
	case nir_intrinsic_bindless_image_store:
	case nir_intrinsic_bindless_image_atomic_add:
	case nir_intrinsic_bindless_image_atomic_imin:
	case nir_intrinsic_bindless_image_atomic_umin:
	case nir_intrinsic_bindless_image_atomic_imax:
	case nir_intrinsic_bindless_image_atomic_umax:
	case nir_intrinsic_bindless_image_atomic_and:
	case nir_intrinsic_bindless_image_atomic_or:
	case nir_intrinsic_bindless_image_atomic_xor:
	case nir_intrinsic_bindless_image_atomic_exchange:
	case nir_intrinsic_bindless_image_atomic_comp_swap:
	case nir_intrinsic_bindless_image_atomic_fadd:
	case nir_intrinsic_bindless_image_atomic_fmin:
	case nir_intrinsic_bindless_image_atomic_fmax:
	case nir_intrinsic_bindless_image_size:
	case nir_intrinsic_bindless_image_samples:
	case nir_intrinsic_image_deref_load:
	case nir_intrinsic_image_deref_sparse_load:
	case nir_intrinsic_image_deref_store:
	case nir_intrinsic_image_deref_atomic_add:
	case nir_intrinsic_image_deref_atomic_umin:
	case nir_intrinsic_image_deref_atomic_imin:
	case nir_intrinsic_image_deref_atomic_umax:
	case nir_intrinsic_image_deref_atomic_imax:
	case nir_intrinsic_image_deref_atomic_and:
	case nir_intrinsic_image_deref_atomic_or:
	case nir_intrinsic_image_deref_atomic_xor:
	case nir_intrinsic_image_deref_atomic_exchange:
	case nir_intrinsic_image_deref_atomic_comp_swap:
	case nir_intrinsic_image_deref_atomic_fadd:
	case nir_intrinsic_image_deref_atomic_fmin:
	case nir_intrinsic_image_deref_atomic_fmax:
	case nir_intrinsic_image_deref_size:
	case nir_intrinsic_image_deref_samples:
	return true;

	default:
	return false;
	}
	}

	static bool
	has_non_uniform_tex_access(nir_tex_instr *tex)
	{
	return tex->texture_non_uniform \|\| tex->sampler_non_uniform;
	}

	static bool
	has_non_uniform_access_intrin(nir_intrinsic_instr *intrin)
	{
	return (nir_intrinsic_access(intrin) & ACCESS_NON_UNIFORM) != 0;
	}

	static bool
	nir_has_non_uniform_access_impl(nir_function_impl *impl, enum nir_lower_non_uniform_access_type types)
	{
	nir_foreach_block_safe(block, impl) {
	nir_foreach_instr_safe(instr, block) {
	switch (instr->type) {
	case nir_instr_type_tex: {
	nir_tex_instr *tex = nir_instr_as_tex(instr);
	if ((types & nir_lower_non_uniform_texture_access) &&
	has_non_uniform_tex_access(tex))
	return true;
	break;
	}

	case nir_instr_type_intrinsic: {
	nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
	if (is_ubo_intrinsic(intrin)) {
	if ((types & nir_lower_non_uniform_ubo_access) &&
	has_non_uniform_access_intrin(intrin))
	return true;
	} else if (is_ssbo_intrinsic(intrin)) {
	if ((types & nir_lower_non_uniform_ssbo_access) &&
	has_non_uniform_access_intrin(intrin))
	return true;
	} else if (is_image_intrinsic(intrin)) {
	if ((types & nir_lower_non_uniform_image_access) &&
	has_non_uniform_access_intrin(intrin))
	return true;
	} else {
	/* Nothing to do */
	}
	break;
	}

	default:
	/* Nothing to do */
	break;
	}
	}
	}

	return false;
	}

	bool
	nir_has_non_uniform_access(nir_shader *shader, enum nir_lower_non_uniform_access_type types)
	{
	nir_foreach_function(function, shader) {
	if (function->impl && nir_has_non_uniform_access_impl(function->impl, types))
	return true;
	}

	return false;
	}

	static bool
	opt_non_uniform_tex_access(nir_tex_instr *tex)
	{
	if (!has_non_uniform_tex_access(tex))
	return false;

	bool progress = false;

	for (unsigned i = 0; i < tex->num_srcs; i++) {
	switch (tex->src[i].src_type) {
	case nir_tex_src_texture_offset:
	case nir_tex_src_texture_handle:
	case nir_tex_src_texture_deref:
	if (tex->texture_non_uniform && !tex->src[i].src.ssa->divergent) {
	tex->texture_non_uniform = false;
	progress = true;
	}
	break;

	case nir_tex_src_sampler_offset:
	case nir_tex_src_sampler_handle:
	case nir_tex_src_sampler_deref:
	if (tex->sampler_non_uniform && !tex->src[i].src.ssa->divergent) {
	tex->sampler_non_uniform = false;
	progress = true;
	}
	break;

	default:
	break;
	}
	}

	return progress;
	}

	static bool
	opt_non_uniform_access_intrin(nir_intrinsic_instr *intrin, unsigned handle_src)
	{
	if (!has_non_uniform_access_intrin(intrin))
	return false;

	if (intrin->src[handle_src].ssa->divergent)
	return false;

	nir_intrinsic_set_access(intrin, nir_intrinsic_access(intrin) & ~ACCESS_NON_UNIFORM);

	return true;
	}

	static bool
	nir_opt_non_uniform_access_instr(nir_builder b, nir_instr instr, UNUSED void *user_data)
	{
	switch (instr->type) {
	case nir_instr_type_tex:
	return opt_non_uniform_tex_access(nir_instr_as_tex(instr));

	case nir_instr_type_intrinsic: {
	nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
	if (is_ubo_intrinsic(intrin) \|\| is_ssbo_intrinsic(intrin) \|\| is_image_intrinsic(intrin)) {
	unsigned handle_src = 0;
	/* SSBO Stores put the index in the second source */
	if (intrin->intrinsic == nir_intrinsic_store_ssbo)
	handle_src = 1;
	return opt_non_uniform_access_intrin(intrin, handle_src);
	}
	break;
	}

	default:
	/* Nothing to do */
	break;
	}

	return false;
	}

	bool
	nir_opt_non_uniform_access(nir_shader *shader)
	{
	NIR_PASS(_, shader, nir_convert_to_lcssa, true, true);
	nir_divergence_analysis(shader);

	bool progress = nir_shader_instructions_pass(shader,
	nir_opt_non_uniform_access_instr,
	nir_metadata_all, NULL);

	NIR_PASS(_, shader, nir_opt_remove_phis); /* cleanup LCSSA phis */

	return progress;
	}