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59e73674c3
This commit drops legacy atomic support from core passes where we can simply delete switch cases with no other changes. As such it's separated from the more complex pass-specific commits for ease of review. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Emma Anholt <emma@anholt.net> Reviewed-by: Jesse Natalie <jenatali@microsoft.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23036>
111 lines
4 KiB
C
111 lines
4 KiB
C
/*
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* Copyright (C) 2020-2021 Collabora, Ltd.
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* Copyright © 2020 Valve Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "compiler/nir/nir.h"
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#include "compiler/nir/nir_builder.h"
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static bool
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lower(nir_builder *b, nir_instr *instr, void *data)
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{
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if (instr->type != nir_instr_type_intrinsic)
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return false;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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bool *lower_plain_stores = data;
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switch (intr->intrinsic) {
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case nir_intrinsic_global_atomic:
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case nir_intrinsic_global_atomic_swap:
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case nir_intrinsic_image_atomic:
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case nir_intrinsic_image_atomic_swap:
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break;
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case nir_intrinsic_store_global:
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case nir_intrinsic_image_store:
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if (!(*lower_plain_stores))
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return false;
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else
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break;
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default:
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return false;
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}
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b->cursor = nir_before_instr(instr);
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bool has_dest = nir_intrinsic_infos[intr->intrinsic].has_dest;
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nir_ssa_def *undef = NULL;
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nir_ssa_def *helper = nir_load_helper_invocation(b, 1);
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nir_push_if(b, nir_inot(b, helper));
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nir_instr_remove(instr);
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nir_builder_instr_insert(b, instr);
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/* Per the spec, it does not matter what we return for helper threads.
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* Represent this by an ssa_undef in the hopes the backend will be clever
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* enough to optimize out the phi.
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*
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* Fragment shader helper invocations execute the same shader code as
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* non-helper invocations, but will not have side effects that modify the
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* framebuffer or other shader-accessible memory. In particular:
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*
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* ...
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*
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* Atomic operations to image, buffer, or atomic counter variables
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* performed by helper invocations have no effect on the underlying
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* image or buffer memory. The values returned by such atomic
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* operations are undefined.
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*/
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if (has_dest) {
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nir_push_else(b, NULL);
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undef = nir_ssa_undef(b, nir_dest_num_components(intr->dest),
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nir_dest_bit_size(intr->dest));
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}
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nir_pop_if(b, NULL);
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if (has_dest) {
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assert(intr->dest.is_ssa);
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nir_ssa_def *phi = nir_if_phi(b, &intr->dest.ssa, undef);
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/* We can't use nir_ssa_def_rewrite_uses_after on phis, so use the global
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* version and fixup the phi manually
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*/
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nir_ssa_def_rewrite_uses(&intr->dest.ssa, phi);
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nir_instr *phi_instr = phi->parent_instr;
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nir_phi_instr *phi_as_phi = nir_instr_as_phi(phi_instr);
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nir_phi_src *phi_src = nir_phi_get_src_from_block(phi_as_phi,
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instr->block);
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nir_instr_rewrite_src_ssa(phi->parent_instr, &phi_src->src,
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&intr->dest.ssa);
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}
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return true;
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}
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bool
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nir_lower_helper_writes(nir_shader *shader, bool lower_plain_stores)
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{
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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return nir_shader_instructions_pass(shader, lower, nir_metadata_none,
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&lower_plain_stores);
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}
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