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

 /*
  * Copyright © 2019 Intel Corporation
  *
  * 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"

 struct nu_handle {
    nir_src *src;
    nir_ssa_def *handle;
    nir_deref_instr *parent_deref;
    nir_ssa_def *first;
 };

 static bool
 nu_handle_init(struct nu_handle *h, nir_src *src)
 {
    h->src = src;

    nir_deref_instr *deref = nir_src_as_deref(*src);
    if (deref) {
       if (deref->deref_type == nir_deref_type_var)
          return false;

       nir_deref_instr *parent = nir_deref_instr_parent(deref);
       assert(parent->deref_type == nir_deref_type_var);

       assert(deref->deref_type == nir_deref_type_array);
       if (nir_src_is_const(deref->arr.index))
          return false;

       assert(deref->arr.index.is_ssa);
       h->handle = deref->arr.index.ssa;
       h->parent_deref = parent;

       return true;
    } else {
       if (nir_src_is_const(*src))
          return false;

       assert(src->is_ssa);
       h->handle = src->ssa;
       h->parent_deref = NULL;

       return true;
    }
 }

 static nir_ssa_def *
 nu_handle_compare(const nir_lower_non_uniform_access_options *options,
                   nir_builder *b, struct nu_handle *handle)
 {
    nir_component_mask_t channel_mask = ~0;
    if (options->callback)
       channel_mask = options->callback(handle->src, options->callback_data);
    channel_mask &= nir_component_mask(handle->handle->num_components);

    nir_ssa_def *channels[NIR_MAX_VEC_COMPONENTS];
    for (unsigned i = 0; i < handle->handle->num_components; i++)
       channels[i] = nir_channel(b, handle->handle, i);

    handle->first = handle->handle;
    nir_ssa_def *equal_first = nir_imm_true(b);
    u_foreach_bit(i, channel_mask) {
       nir_ssa_def *first = nir_read_first_invocation(b, channels[i]);
       handle->first = nir_vector_insert_imm(b, handle->first, first, i);

       equal_first = nir_iand(b, equal_first, nir_ieq(b, first, channels[i]));
    }

    return equal_first;
 }

 static void
 nu_handle_rewrite(nir_builder *b, struct nu_handle *h)
 {
    if (h->parent_deref) {
       /* Replicate the deref. */
       nir_deref_instr *deref =
          nir_build_deref_array(b, h->parent_deref, h->first);
       *(h->src) = nir_src_for_ssa(&deref->dest.ssa);
    } else {
       *(h->src) = nir_src_for_ssa(h->first);
    }
 }

 static bool
 lower_non_uniform_tex_access(const nir_lower_non_uniform_access_options *options,
                              nir_builder *b, nir_tex_instr *tex)
 {
    if (!tex->texture_non_uniform && !tex->sampler_non_uniform)
       return false;

    /* We can have at most one texture and one sampler handle */
    unsigned num_handles = 0;
    struct nu_handle handles[2];
    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)
             continue;
          break;

       case nir_tex_src_sampler_offset:
       case nir_tex_src_sampler_handle:
       case nir_tex_src_sampler_deref:
          if (!tex->sampler_non_uniform)
             continue;
          break;

       default:
          continue;
       }

       assert(num_handles <= ARRAY_SIZE(handles));
       if (nu_handle_init(&handles[num_handles], &tex->src[i].src))
          num_handles++;
    }

    if (num_handles == 0)
       return false;

    b->cursor = nir_instr_remove(&tex->instr);

    nir_push_loop(b);

    nir_ssa_def *all_equal_first = nir_imm_true(b);
    for (unsigned i = 0; i < num_handles; i++) {
       if (i && handles[i].handle == handles[0].handle) {
          handles[i].first = handles[0].first;
          continue;
       }

       nir_ssa_def *equal_first = nu_handle_compare(options, b, &handles[i]);
       all_equal_first = nir_iand(b, all_equal_first, equal_first);
    }

    nir_push_if(b, all_equal_first);

    for (unsigned i = 0; i < num_handles; i++)
       nu_handle_rewrite(b, &handles[i]);

    nir_builder_instr_insert(b, &tex->instr);
    nir_jump(b, nir_jump_break);

    tex->texture_non_uniform = false;
    tex->sampler_non_uniform = false;

    return true;
 }

 static bool
 lower_non_uniform_access_intrin(const nir_lower_non_uniform_access_options *options,
                                 nir_builder *b, nir_intrinsic_instr *intrin,
                                 unsigned handle_src)
 {
    if (!(nir_intrinsic_access(intrin) & ACCESS_NON_UNIFORM))
       return false;

    struct nu_handle handle;
    if (!nu_handle_init(&handle, &intrin->src[handle_src]))
       return false;

    b->cursor = nir_instr_remove(&intrin->instr);

    nir_push_loop(b);

    nir_push_if(b, nu_handle_compare(options, b, &handle));

    nu_handle_rewrite(b, &handle);

    nir_builder_instr_insert(b, &intrin->instr);
    nir_jump(b, nir_jump_break);

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

    return true;
 }

 static bool
 nir_lower_non_uniform_access_impl(nir_function_impl *impl,
                                   const nir_lower_non_uniform_access_options *options)
 {
    bool progress = false;

    nir_builder b;
    nir_builder_init(&b, impl);

    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 ((options->types & nir_lower_non_uniform_texture_access) &&
                 lower_non_uniform_tex_access(options, &b, tex))
                progress = true;
             break;
          }

          case nir_instr_type_intrinsic: {
             nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
             switch (intrin->intrinsic) {
             case nir_intrinsic_load_ubo:
                if ((options->types & nir_lower_non_uniform_ubo_access) &&
                    lower_non_uniform_access_intrin(options, &b, intrin, 0))
                   progress = true;
                break;

             case nir_intrinsic_load_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:
                if ((options->types & nir_lower_non_uniform_ssbo_access) &&
                    lower_non_uniform_access_intrin(options, &b, intrin, 0))
                   progress = true;
                break;

             case nir_intrinsic_store_ssbo:
                /* SSBO Stores put the index in the second source */
                if ((options->types & nir_lower_non_uniform_ssbo_access) &&
                    lower_non_uniform_access_intrin(options, &b, intrin, 1))
                   progress = true;
                break;

             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_image_samples_identical:
             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_bindless_image_samples_identical:
             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:
             case nir_intrinsic_image_deref_samples_identical:
                if ((options->types & nir_lower_non_uniform_image_access) &&
                    lower_non_uniform_access_intrin(options, &b, intrin, 0))
                   progress = true;
                break;

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

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

    if (progress)
       nir_metadata_preserve(impl, nir_metadata_none);

    return progress;
 }

 /**
  * Lowers non-uniform resource access by using a loop
  *
  * This pass lowers non-uniform resource access by using subgroup operations
  * and a loop.  Most hardware requires things like textures and UBO access
  * operations to happen on a dynamically uniform (or at least subgroup
  * uniform) resource.  This pass allows for non-uniform access by placing the
  * texture instruction in a loop that looks something like this:
  *
  * loop {
  *    bool tex_eq_first = readFirstInvocationARB(texture) == texture;
  *    bool smp_eq_first = readFirstInvocationARB(sampler) == sampler;
  *    if (tex_eq_first && smp_eq_first) {
  *       res = texture(texture, sampler, ...);
  *       break;
  *    }
  * }
  *
  * Fortunately, because the instruction is immediately followed by the only
  * break in the loop, the block containing the instruction dominates the end
  * of the loop.  Therefore, it's safe to move the instruction into the loop
  * without fixing up SSA in any way.
  */
 bool
 nir_lower_non_uniform_access(nir_shader *shader,
                              const nir_lower_non_uniform_access_options *options)
 {
    bool progress = false;

    nir_foreach_function(function, shader) {
       if (function->impl &&
           nir_lower_non_uniform_access_impl(function->impl, options))
          progress = true;
    }

    return progress;
 }
	/*
	* Copyright © 2019 Intel Corporation
	*
	* 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"

	struct nu_handle {
	nir_src *src;
	nir_ssa_def *handle;
	nir_deref_instr *parent_deref;
	nir_ssa_def *first;
	};

	static bool
	nu_handle_init(struct nu_handle h, nir_src src)
	{
	h->src = src;

	nir_deref_instr deref = nir_src_as_deref(src);
	if (deref) {
	if (deref->deref_type == nir_deref_type_var)
	return false;

	nir_deref_instr *parent = nir_deref_instr_parent(deref);
	assert(parent->deref_type == nir_deref_type_var);

	assert(deref->deref_type == nir_deref_type_array);
	if (nir_src_is_const(deref->arr.index))
	return false;

	assert(deref->arr.index.is_ssa);
	h->handle = deref->arr.index.ssa;
	h->parent_deref = parent;

	return true;
	} else {
	if (nir_src_is_const(*src))
	return false;

	assert(src->is_ssa);
	h->handle = src->ssa;
	h->parent_deref = NULL;

	return true;
	}
	}

	static nir_ssa_def *
	nu_handle_compare(const nir_lower_non_uniform_access_options *options,
	nir_builder b, struct nu_handle handle)
	{
	nir_component_mask_t channel_mask = ~0;
	if (options->callback)
	channel_mask = options->callback(handle->src, options->callback_data);
	channel_mask &= nir_component_mask(handle->handle->num_components);

	nir_ssa_def *channels[NIR_MAX_VEC_COMPONENTS];
	for (unsigned i = 0; i < handle->handle->num_components; i++)
	channels[i] = nir_channel(b, handle->handle, i);

	handle->first = handle->handle;
	nir_ssa_def *equal_first = nir_imm_true(b);
	u_foreach_bit(i, channel_mask) {
	nir_ssa_def *first = nir_read_first_invocation(b, channels[i]);
	handle->first = nir_vector_insert_imm(b, handle->first, first, i);

	equal_first = nir_iand(b, equal_first, nir_ieq(b, first, channels[i]));
	}

	return equal_first;
	}

	static void
	nu_handle_rewrite(nir_builder b, struct nu_handle h)
	{
	if (h->parent_deref) {
	/* Replicate the deref. */
	nir_deref_instr *deref =
	nir_build_deref_array(b, h->parent_deref, h->first);
	*(h->src) = nir_src_for_ssa(&deref->dest.ssa);
	} else {
	*(h->src) = nir_src_for_ssa(h->first);
	}
	}

	static bool
	lower_non_uniform_tex_access(const nir_lower_non_uniform_access_options *options,
	nir_builder b, nir_tex_instr tex)
	{
	if (!tex->texture_non_uniform && !tex->sampler_non_uniform)
	return false;

	/* We can have at most one texture and one sampler handle */
	unsigned num_handles = 0;
	struct nu_handle handles[2];
	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)
	continue;
	break;

	case nir_tex_src_sampler_offset:
	case nir_tex_src_sampler_handle:
	case nir_tex_src_sampler_deref:
	if (!tex->sampler_non_uniform)
	continue;
	break;

	default:
	continue;
	}

	assert(num_handles <= ARRAY_SIZE(handles));
	if (nu_handle_init(&handles[num_handles], &tex->src[i].src))
	num_handles++;
	}

	if (num_handles == 0)
	return false;

	b->cursor = nir_instr_remove(&tex->instr);

	nir_push_loop(b);

	nir_ssa_def *all_equal_first = nir_imm_true(b);
	for (unsigned i = 0; i < num_handles; i++) {
	if (i && handles[i].handle == handles[0].handle) {
	handles[i].first = handles[0].first;
	continue;
	}

	nir_ssa_def *equal_first = nu_handle_compare(options, b, &handles[i]);
	all_equal_first = nir_iand(b, all_equal_first, equal_first);
	}

	nir_push_if(b, all_equal_first);

	for (unsigned i = 0; i < num_handles; i++)
	nu_handle_rewrite(b, &handles[i]);

	nir_builder_instr_insert(b, &tex->instr);
	nir_jump(b, nir_jump_break);

	tex->texture_non_uniform = false;
	tex->sampler_non_uniform = false;

	return true;
	}

	static bool
	lower_non_uniform_access_intrin(const nir_lower_non_uniform_access_options *options,
	nir_builder b, nir_intrinsic_instr intrin,
	unsigned handle_src)
	{
	if (!(nir_intrinsic_access(intrin) & ACCESS_NON_UNIFORM))
	return false;

	struct nu_handle handle;
	if (!nu_handle_init(&handle, &intrin->src[handle_src]))
	return false;

	b->cursor = nir_instr_remove(&intrin->instr);

	nir_push_loop(b);

	nir_push_if(b, nu_handle_compare(options, b, &handle));

	nu_handle_rewrite(b, &handle);

	nir_builder_instr_insert(b, &intrin->instr);
	nir_jump(b, nir_jump_break);

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

	return true;
	}

	static bool
	nir_lower_non_uniform_access_impl(nir_function_impl *impl,
	const nir_lower_non_uniform_access_options *options)
	{
	bool progress = false;

	nir_builder b;
	nir_builder_init(&b, impl);

	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 ((options->types & nir_lower_non_uniform_texture_access) &&
	lower_non_uniform_tex_access(options, &b, tex))
	progress = true;
	break;
	}

	case nir_instr_type_intrinsic: {
	nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
	switch (intrin->intrinsic) {
	case nir_intrinsic_load_ubo:
	if ((options->types & nir_lower_non_uniform_ubo_access) &&
	lower_non_uniform_access_intrin(options, &b, intrin, 0))
	progress = true;
	break;

	case nir_intrinsic_load_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:
	if ((options->types & nir_lower_non_uniform_ssbo_access) &&
	lower_non_uniform_access_intrin(options, &b, intrin, 0))
	progress = true;
	break;

	case nir_intrinsic_store_ssbo:
	/* SSBO Stores put the index in the second source */
	if ((options->types & nir_lower_non_uniform_ssbo_access) &&
	lower_non_uniform_access_intrin(options, &b, intrin, 1))
	progress = true;
	break;

	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_image_samples_identical:
	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_bindless_image_samples_identical:
	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:
	case nir_intrinsic_image_deref_samples_identical:
	if ((options->types & nir_lower_non_uniform_image_access) &&
	lower_non_uniform_access_intrin(options, &b, intrin, 0))
	progress = true;
	break;

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

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

	if (progress)
	nir_metadata_preserve(impl, nir_metadata_none);

	return progress;
	}

	/**
	* Lowers non-uniform resource access by using a loop
	*
	* This pass lowers non-uniform resource access by using subgroup operations
	* and a loop. Most hardware requires things like textures and UBO access
	* operations to happen on a dynamically uniform (or at least subgroup
	* uniform) resource. This pass allows for non-uniform access by placing the
	* texture instruction in a loop that looks something like this:
	*
	* loop {
	* bool tex_eq_first = readFirstInvocationARB(texture) == texture;
	* bool smp_eq_first = readFirstInvocationARB(sampler) == sampler;
	* if (tex_eq_first && smp_eq_first) {
	* res = texture(texture, sampler, ...);
	* break;
	* }
	* }
	*
	* Fortunately, because the instruction is immediately followed by the only
	* break in the loop, the block containing the instruction dominates the end
	* of the loop. Therefore, it's safe to move the instruction into the loop
	* without fixing up SSA in any way.
	*/
	bool
	nir_lower_non_uniform_access(nir_shader *shader,
	const nir_lower_non_uniform_access_options *options)
	{
	bool progress = false;

	nir_foreach_function(function, shader) {
	if (function->impl &&
	nir_lower_non_uniform_access_impl(function->impl, options))
	progress = true;
	}

	return progress;
	}