ac/nir: Add vote_ieq/vote_feq lowering pass.
The old vote_eq implementation supported only booleans, but now we have to support arbitrary values, so use the read_first_invocation intrinsic + ballot. I took this as an opportunity to figure out how easy it was to do this in nir instead of in the nir_to_llvm pass, and it actually turned out pretty okay IMO. Only creating the pass is some extra code. Reviewed-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
@@ -44,6 +44,7 @@ AMD_COMPILER_FILES = \
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common/ac_llvm_helper.cpp \
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common/ac_llvm_util.c \
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common/ac_llvm_util.h \
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common/ac_lower_subgroups.c \
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common/ac_shader_abi.h \
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common/ac_shader_info.c \
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common/ac_shader_info.h \
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92
src/amd/common/ac_lower_subgroups.c
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92
src/amd/common/ac_lower_subgroups.c
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@@ -0,0 +1,92 @@
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/*
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* Copyright © 2018 Google Inc.
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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 "nir/nir.h"
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#include "nir/nir_builder.h"
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#include "ac_nir_to_llvm.h"
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static nir_ssa_def *ac_lower_subgroups_intrin(nir_builder *b, nir_intrinsic_instr *intrin)
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{
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switch(intrin->intrinsic) {
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case nir_intrinsic_vote_ieq:
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case nir_intrinsic_vote_feq: {
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nir_intrinsic_instr *rfi =
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nir_intrinsic_instr_create(b->shader, nir_intrinsic_read_first_invocation);
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nir_ssa_dest_init(&rfi->instr, &rfi->dest,
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1, intrin->src[0].ssa->bit_size, NULL);
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nir_src_copy(&rfi->src[0], &intrin->src[0], rfi);
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rfi->num_components = 1;
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nir_ssa_def *is_ne;
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if (intrin->intrinsic == nir_intrinsic_vote_feq)
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is_ne = nir_fne(b, &rfi->dest.ssa, intrin->src[0].ssa);
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else
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is_ne = nir_ine(b, &rfi->dest.ssa, intrin->src[0].ssa);
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nir_intrinsic_instr *ballot =
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nir_intrinsic_instr_create(b->shader, nir_intrinsic_ballot);
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nir_ssa_dest_init(&ballot->instr, &ballot->dest,
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1, 64, NULL);
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ballot->src[0] = nir_src_for_ssa(is_ne);
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ballot->num_components = 1;
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return nir_ieq(b, &ballot->dest.ssa, nir_imm_int64(b, 0));
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}
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default:
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return NULL;
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}
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}
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bool ac_lower_subgroups(struct nir_shader *shader)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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b.cursor = nir_before_instr(instr);
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nir_ssa_def *lower = ac_lower_subgroups_intrin(&b, intrin);
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if (!lower)
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continue;
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nir_ssa_def_rewrite_uses(&intrin->dest.ssa, nir_src_for_ssa(lower));
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nir_instr_remove(instr);
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progress = true;
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}
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}
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}
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return progress;
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}
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@@ -4563,11 +4563,6 @@ static void visit_intrinsic(struct ac_nir_context *ctx,
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result = LLVMBuildSExt(ctx->ac.builder, tmp, ctx->ac.i32, "");
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break;
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}
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case nir_intrinsic_vote_ieq: {
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LLVMValueRef tmp = ac_build_vote_eq(&ctx->ac, get_src(ctx, instr->src[0]));
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result = LLVMBuildSExt(ctx->ac.builder, tmp, ctx->ac.i32, "");
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break;
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}
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default:
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fprintf(stderr, "Unknown intrinsic: ");
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nir_print_instr(&instr->instr, stderr);
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@@ -6757,6 +6752,9 @@ void ac_nir_translate(struct ac_llvm_context *ac, struct ac_shader_abi *abi,
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struct ac_nir_context ctx = {};
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struct nir_function *func;
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/* Last minute passes for both radv & radeonsi */
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ac_lower_subgroups(nir);
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ctx.ac = *ac;
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ctx.abi = abi;
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@@ -235,4 +235,6 @@ void ac_lower_indirect_derefs(struct nir_shader *nir, enum chip_class);
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void ac_nir_translate(struct ac_llvm_context *ac, struct ac_shader_abi *abi,
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struct nir_shader *nir);
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bool ac_lower_subgroups(struct nir_shader *shader);
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#endif /* AC_NIR_TO_LLVM_H */
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@@ -35,6 +35,7 @@ amd_common_files = files(
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'ac_llvm_helper.cpp',
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'ac_llvm_util.c',
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'ac_llvm_util.h',
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'ac_lower_subgroups.c',
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'ac_shader_abi.h',
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'ac_shader_info.c',
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'ac_shader_info.h',
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