/* * Copyright 2017 Advanced Micro Devices, Inc. * * 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 * on the rights to use, copy, modify, merge, publish, distribute, sub * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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 "si_pipe.h" #include "si_shader_internal.h" #include "sid.h" #include "util/u_memory.h" #include "util/u_prim.h" static LLVMValueRef get_wave_id_in_tg(struct si_shader_context *ctx) { return si_unpack_param(ctx, ctx->merged_wave_info, 24, 4); } static LLVMValueRef get_tgsize(struct si_shader_context *ctx) { return si_unpack_param(ctx, ctx->merged_wave_info, 28, 4); } static LLVMValueRef get_thread_id_in_tg(struct si_shader_context *ctx) { LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef tmp; tmp = LLVMBuildMul(builder, get_wave_id_in_tg(ctx), LLVMConstInt(ctx->ac.i32, ctx->ac.wave_size, false), ""); return LLVMBuildAdd(builder, tmp, ac_get_thread_id(&ctx->ac), ""); } static LLVMValueRef ngg_get_vtx_cnt(struct si_shader_context *ctx) { return si_unpack_param(ctx, ctx->gs_tg_info, 12, 9); } static LLVMValueRef ngg_get_prim_cnt(struct si_shader_context *ctx) { return si_unpack_param(ctx, ctx->gs_tg_info, 22, 9); } static LLVMValueRef ngg_get_ordered_id(struct si_shader_context *ctx) { return si_unpack_param(ctx, ctx->gs_tg_info, 0, 12); } static LLVMValueRef ngg_get_query_buf(struct si_shader_context *ctx) { LLVMValueRef buf_ptr = ac_get_arg(&ctx->ac, ctx->rw_buffers); return ac_build_load_to_sgpr(&ctx->ac, buf_ptr, LLVMConstInt(ctx->i32, GFX10_GS_QUERY_BUF, false)); } static LLVMValueRef ngg_get_initial_edgeflag(struct si_shader_context *ctx, unsigned index) { if (ctx->type == PIPE_SHADER_VERTEX) { LLVMValueRef tmp; tmp = LLVMBuildLShr(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args.gs_invocation_id), LLVMConstInt(ctx->ac.i32, 8 + index, false), ""); return LLVMBuildTrunc(ctx->ac.builder, tmp, ctx->ac.i1, ""); } return ctx->i1false; } /** * Return the number of vertices as a constant in \p num_vertices, * and return a more precise value as LLVMValueRef from the function. */ static LLVMValueRef ngg_get_vertices_per_prim(struct si_shader_context *ctx, unsigned *num_vertices) { const struct si_shader_info *info = &ctx->shader->selector->info; if (ctx->type == PIPE_SHADER_VERTEX) { if (info->properties[TGSI_PROPERTY_VS_BLIT_SGPRS_AMD]) { /* Blits always use axis-aligned rectangles with 3 vertices. */ *num_vertices = 3; return LLVMConstInt(ctx->i32, 3, 0); } else { /* We always build up all three indices for the prim export * independent of the primitive type. The additional garbage * data shouldn't hurt. This number doesn't matter with * NGG passthrough. */ *num_vertices = 3; /* Extract OUTPRIM field. */ LLVMValueRef num = si_unpack_param(ctx, ctx->vs_state_bits, 2, 2); return LLVMBuildAdd(ctx->ac.builder, num, ctx->i32_1, ""); } } else { assert(ctx->type == PIPE_SHADER_TESS_EVAL); if (info->properties[TGSI_PROPERTY_TES_POINT_MODE]) *num_vertices = 1; else if (info->properties[TGSI_PROPERTY_TES_PRIM_MODE] == PIPE_PRIM_LINES) *num_vertices = 2; else *num_vertices = 3; return LLVMConstInt(ctx->i32, *num_vertices, false); } } static void build_streamout_vertex(struct si_shader_context *ctx, LLVMValueRef *so_buffer, LLVMValueRef *wg_offset_dw, unsigned stream, LLVMValueRef offset_vtx, LLVMValueRef vertexptr) { struct si_shader_info *info = &ctx->shader->selector->info; struct pipe_stream_output_info *so = &ctx->shader->selector->so; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef offset[4] = {}; LLVMValueRef tmp; for (unsigned buffer = 0; buffer < 4; ++buffer) { if (!wg_offset_dw[buffer]) continue; tmp = LLVMBuildMul(builder, offset_vtx, LLVMConstInt(ctx->i32, so->stride[buffer], false), ""); tmp = LLVMBuildAdd(builder, wg_offset_dw[buffer], tmp, ""); offset[buffer] = LLVMBuildShl(builder, tmp, LLVMConstInt(ctx->i32, 2, false), ""); } for (unsigned i = 0; i < so->num_outputs; ++i) { if (so->output[i].stream != stream) continue; unsigned reg = so->output[i].register_index; struct si_shader_output_values out; out.semantic_name = info->output_semantic_name[reg]; out.semantic_index = info->output_semantic_index[reg]; for (unsigned comp = 0; comp < 4; comp++) { tmp = ac_build_gep0(&ctx->ac, vertexptr, LLVMConstInt(ctx->i32, 4 * reg + comp, false)); out.values[comp] = LLVMBuildLoad(builder, tmp, ""); out.vertex_stream[comp] = (info->output_streams[reg] >> (2 * comp)) & 3; } si_emit_streamout_output(ctx, so_buffer, offset, &so->output[i], &out); } } struct ngg_streamout { LLVMValueRef num_vertices; /* per-thread data */ LLVMValueRef prim_enable[4]; /* i1 per stream */ LLVMValueRef vertices[3]; /* [N x i32] addrspace(LDS)* */ /* Output */ LLVMValueRef emit[4]; /* per-stream emitted primitives (only valid for used streams) */ }; /** * Build streamout logic. * * Implies a barrier. * * Writes number of emitted primitives to gs_ngg_scratch[4:8]. * * Clobbers gs_ngg_scratch[8:]. */ static void build_streamout(struct si_shader_context *ctx, struct ngg_streamout *nggso) { struct si_shader_info *info = &ctx->shader->selector->info; struct pipe_stream_output_info *so = &ctx->shader->selector->so; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef buf_ptr = ac_get_arg(&ctx->ac, ctx->rw_buffers); LLVMValueRef tid = get_thread_id_in_tg(ctx); LLVMValueRef tmp, tmp2; LLVMValueRef i32_2 = LLVMConstInt(ctx->i32, 2, false); LLVMValueRef i32_4 = LLVMConstInt(ctx->i32, 4, false); LLVMValueRef i32_8 = LLVMConstInt(ctx->i32, 8, false); LLVMValueRef so_buffer[4] = {}; unsigned max_num_vertices = 1 + (nggso->vertices[1] ? 1 : 0) + (nggso->vertices[2] ? 1 : 0); LLVMValueRef prim_stride_dw[4] = {}; LLVMValueRef prim_stride_dw_vgpr = LLVMGetUndef(ctx->i32); int stream_for_buffer[4] = { -1, -1, -1, -1 }; unsigned bufmask_for_stream[4] = {}; bool isgs = ctx->type == PIPE_SHADER_GEOMETRY; unsigned scratch_emit_base = isgs ? 4 : 0; LLVMValueRef scratch_emit_basev = isgs ? i32_4 : ctx->i32_0; unsigned scratch_offset_base = isgs ? 8 : 4; LLVMValueRef scratch_offset_basev = isgs ? i32_8 : i32_4; ac_llvm_add_target_dep_function_attr(ctx->main_fn, "amdgpu-gds-size", 256); /* Determine the mapping of streamout buffers to vertex streams. */ for (unsigned i = 0; i < so->num_outputs; ++i) { unsigned buf = so->output[i].output_buffer; unsigned stream = so->output[i].stream; assert(stream_for_buffer[buf] < 0 || stream_for_buffer[buf] == stream); stream_for_buffer[buf] = stream; bufmask_for_stream[stream] |= 1 << buf; } for (unsigned buffer = 0; buffer < 4; ++buffer) { if (stream_for_buffer[buffer] == -1) continue; assert(so->stride[buffer]); tmp = LLVMConstInt(ctx->i32, so->stride[buffer], false); prim_stride_dw[buffer] = LLVMBuildMul(builder, tmp, nggso->num_vertices, ""); prim_stride_dw_vgpr = ac_build_writelane( &ctx->ac, prim_stride_dw_vgpr, prim_stride_dw[buffer], LLVMConstInt(ctx->i32, buffer, false)); so_buffer[buffer] = ac_build_load_to_sgpr( &ctx->ac, buf_ptr, LLVMConstInt(ctx->i32, SI_VS_STREAMOUT_BUF0 + buffer, false)); } tmp = LLVMBuildICmp(builder, LLVMIntEQ, get_wave_id_in_tg(ctx), ctx->i32_0, ""); ac_build_ifcc(&ctx->ac, tmp, 5200); { LLVMTypeRef gdsptr = LLVMPointerType(ctx->i32, AC_ADDR_SPACE_GDS); LLVMValueRef gdsbase = LLVMBuildIntToPtr(builder, ctx->i32_0, gdsptr, ""); /* Advance the streamout offsets in GDS. */ LLVMValueRef offsets_vgpr = ac_build_alloca_undef(&ctx->ac, ctx->i32, ""); LLVMValueRef generated_by_stream_vgpr = ac_build_alloca_undef(&ctx->ac, ctx->i32, ""); tmp = LLVMBuildICmp(builder, LLVMIntULT, ac_get_thread_id(&ctx->ac), i32_4, ""); ac_build_ifcc(&ctx->ac, tmp, 5210); { if (isgs) { tmp = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, tid); tmp = LLVMBuildLoad(builder, tmp, ""); } else { tmp = ac_build_writelane(&ctx->ac, ctx->i32_0, ngg_get_prim_cnt(ctx), ctx->i32_0); } LLVMBuildStore(builder, tmp, generated_by_stream_vgpr); unsigned swizzle[4]; int unused_stream = -1; for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) { unused_stream = stream; break; } } for (unsigned buffer = 0; buffer < 4; ++buffer) { if (stream_for_buffer[buffer] >= 0) { swizzle[buffer] = stream_for_buffer[buffer]; } else { assert(unused_stream >= 0); swizzle[buffer] = unused_stream; } } tmp = ac_build_quad_swizzle(&ctx->ac, tmp, swizzle[0], swizzle[1], swizzle[2], swizzle[3]); tmp = LLVMBuildMul(builder, tmp, prim_stride_dw_vgpr, ""); LLVMValueRef args[] = { LLVMBuildIntToPtr(builder, ngg_get_ordered_id(ctx), gdsptr, ""), tmp, ctx->i32_0, // ordering ctx->i32_0, // scope ctx->ac.i1false, // isVolatile LLVMConstInt(ctx->i32, 4 << 24, false), // OA index ctx->ac.i1true, // wave release ctx->ac.i1true, // wave done }; tmp = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.ds.ordered.add", ctx->i32, args, ARRAY_SIZE(args), 0); /* Keep offsets in a VGPR for quick retrieval via readlane by * the first wave for bounds checking, and also store in LDS * for retrieval by all waves later. */ LLVMBuildStore(builder, tmp, offsets_vgpr); tmp2 = LLVMBuildAdd(builder, ac_get_thread_id(&ctx->ac), scratch_offset_basev, ""); tmp2 = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, tmp2); LLVMBuildStore(builder, tmp, tmp2); } ac_build_endif(&ctx->ac, 5210); /* Determine the max emit per buffer. This is done via the SALU, in part * because LLVM can't generate divide-by-multiply if we try to do this * via VALU with one lane per buffer. */ LLVMValueRef max_emit[4] = {}; for (unsigned buffer = 0; buffer < 4; ++buffer) { if (stream_for_buffer[buffer] == -1) continue; LLVMValueRef bufsize_dw = LLVMBuildLShr(builder, LLVMBuildExtractElement(builder, so_buffer[buffer], i32_2, ""), i32_2, ""); tmp = LLVMBuildLoad(builder, offsets_vgpr, ""); LLVMValueRef offset_dw = ac_build_readlane(&ctx->ac, tmp, LLVMConstInt(ctx->i32, buffer, false)); tmp = LLVMBuildSub(builder, bufsize_dw, offset_dw, ""); tmp = LLVMBuildUDiv(builder, tmp, prim_stride_dw[buffer], ""); tmp2 = LLVMBuildICmp(builder, LLVMIntULT, bufsize_dw, offset_dw, ""); max_emit[buffer] = LLVMBuildSelect(builder, tmp2, ctx->i32_0, tmp, ""); } /* Determine the number of emitted primitives per stream and fixup the * GDS counter if necessary. * * This is complicated by the fact that a single stream can emit to * multiple buffers (but luckily not vice versa). */ LLVMValueRef emit_vgpr = ctx->i32_0; for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; tmp = LLVMBuildLoad(builder, generated_by_stream_vgpr, ""); LLVMValueRef generated = ac_build_readlane(&ctx->ac, tmp, LLVMConstInt(ctx->i32, stream, false)); LLVMValueRef emit = generated; for (unsigned buffer = 0; buffer < 4; ++buffer) { if (stream_for_buffer[buffer] == stream) emit = ac_build_umin(&ctx->ac, emit, max_emit[buffer]); } emit_vgpr = ac_build_writelane(&ctx->ac, emit_vgpr, emit, LLVMConstInt(ctx->i32, stream, false)); /* Fixup the offset using a plain GDS atomic if we overflowed. */ tmp = LLVMBuildICmp(builder, LLVMIntULT, emit, generated, ""); ac_build_ifcc(&ctx->ac, tmp, 5221); /* scalar branch */ tmp = LLVMBuildLShr(builder, LLVMConstInt(ctx->i32, bufmask_for_stream[stream], false), ac_get_thread_id(&ctx->ac), ""); tmp = LLVMBuildTrunc(builder, tmp, ctx->i1, ""); ac_build_ifcc(&ctx->ac, tmp, 5222); { tmp = LLVMBuildSub(builder, generated, emit, ""); tmp = LLVMBuildMul(builder, tmp, prim_stride_dw_vgpr, ""); tmp2 = LLVMBuildGEP(builder, gdsbase, &tid, 1, ""); LLVMBuildAtomicRMW(builder, LLVMAtomicRMWBinOpSub, tmp2, tmp, LLVMAtomicOrderingMonotonic, false); } ac_build_endif(&ctx->ac, 5222); ac_build_endif(&ctx->ac, 5221); } tmp = LLVMBuildICmp(builder, LLVMIntULT, ac_get_thread_id(&ctx->ac), i32_4, ""); ac_build_ifcc(&ctx->ac, tmp, 5225); { tmp = LLVMBuildAdd(builder, ac_get_thread_id(&ctx->ac), scratch_emit_basev, ""); tmp = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, tmp); LLVMBuildStore(builder, emit_vgpr, tmp); } ac_build_endif(&ctx->ac, 5225); } ac_build_endif(&ctx->ac, 5200); /* Determine the workgroup-relative per-thread / primitive offset into * the streamout buffers */ struct ac_wg_scan primemit_scan[4] = {}; if (isgs) { for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; primemit_scan[stream].enable_exclusive = true; primemit_scan[stream].op = nir_op_iadd; primemit_scan[stream].src = nggso->prim_enable[stream]; primemit_scan[stream].scratch = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, LLVMConstInt(ctx->i32, 12 + 8 * stream, false)); primemit_scan[stream].waveidx = get_wave_id_in_tg(ctx); primemit_scan[stream].numwaves = get_tgsize(ctx); primemit_scan[stream].maxwaves = 8; ac_build_wg_scan_top(&ctx->ac, &primemit_scan[stream]); } } ac_build_s_barrier(&ctx->ac); /* Fetch the per-buffer offsets and per-stream emit counts in all waves. */ LLVMValueRef wgoffset_dw[4] = {}; { LLVMValueRef scratch_vgpr; tmp = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, ac_get_thread_id(&ctx->ac)); scratch_vgpr = LLVMBuildLoad(builder, tmp, ""); for (unsigned buffer = 0; buffer < 4; ++buffer) { if (stream_for_buffer[buffer] >= 0) { wgoffset_dw[buffer] = ac_build_readlane( &ctx->ac, scratch_vgpr, LLVMConstInt(ctx->i32, scratch_offset_base + buffer, false)); } } for (unsigned stream = 0; stream < 4; ++stream) { if (info->num_stream_output_components[stream]) { nggso->emit[stream] = ac_build_readlane( &ctx->ac, scratch_vgpr, LLVMConstInt(ctx->i32, scratch_emit_base + stream, false)); } } } /* Write out primitive data */ for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; if (isgs) { ac_build_wg_scan_bottom(&ctx->ac, &primemit_scan[stream]); } else { primemit_scan[stream].result_exclusive = tid; } tmp = LLVMBuildICmp(builder, LLVMIntULT, primemit_scan[stream].result_exclusive, nggso->emit[stream], ""); tmp = LLVMBuildAnd(builder, tmp, nggso->prim_enable[stream], ""); ac_build_ifcc(&ctx->ac, tmp, 5240); { LLVMValueRef offset_vtx = LLVMBuildMul(builder, primemit_scan[stream].result_exclusive, nggso->num_vertices, ""); for (unsigned i = 0; i < max_num_vertices; ++i) { tmp = LLVMBuildICmp(builder, LLVMIntULT, LLVMConstInt(ctx->i32, i, false), nggso->num_vertices, ""); ac_build_ifcc(&ctx->ac, tmp, 5241); build_streamout_vertex(ctx, so_buffer, wgoffset_dw, stream, offset_vtx, nggso->vertices[i]); ac_build_endif(&ctx->ac, 5241); offset_vtx = LLVMBuildAdd(builder, offset_vtx, ctx->i32_1, ""); } } ac_build_endif(&ctx->ac, 5240); } } static unsigned ngg_nogs_vertex_size(struct si_shader *shader) { unsigned lds_vertex_size = 0; /* The edgeflag is always stored in the last element that's also * used for padding to reduce LDS bank conflicts. */ if (shader->selector->so.num_outputs) lds_vertex_size = 4 * shader->selector->info.num_outputs + 1; if (shader->selector->info.writes_edgeflag) lds_vertex_size = MAX2(lds_vertex_size, 1); /* LDS size for passing data from GS to ES. * GS stores Primitive IDs into LDS at the address corresponding * to the ES thread of the provoking vertex. All ES threads * load and export PrimitiveID for their thread. */ if (shader->selector->type == PIPE_SHADER_VERTEX && shader->key.mono.u.vs_export_prim_id) lds_vertex_size = MAX2(lds_vertex_size, 1); return lds_vertex_size; } /** * Returns an `[N x i32] addrspace(LDS)*` pointing at contiguous LDS storage * for the vertex outputs. */ static LLVMValueRef ngg_nogs_vertex_ptr(struct si_shader_context *ctx, LLVMValueRef vtxid) { /* The extra dword is used to avoid LDS bank conflicts. */ unsigned vertex_size = ngg_nogs_vertex_size(ctx->shader); LLVMTypeRef ai32 = LLVMArrayType(ctx->i32, vertex_size); LLVMTypeRef pai32 = LLVMPointerType(ai32, AC_ADDR_SPACE_LDS); LLVMValueRef tmp = LLVMBuildBitCast(ctx->ac.builder, ctx->esgs_ring, pai32, ""); return LLVMBuildGEP(ctx->ac.builder, tmp, &vtxid, 1, ""); } /** * Emit the epilogue of an API VS or TES shader compiled as ESGS shader. */ void gfx10_emit_ngg_epilogue(struct ac_shader_abi *abi, unsigned max_outputs, LLVMValueRef *addrs) { struct si_shader_context *ctx = si_shader_context_from_abi(abi); struct si_shader_selector *sel = ctx->shader->selector; struct si_shader_info *info = &sel->info; struct si_shader_output_values outputs[PIPE_MAX_SHADER_OUTPUTS]; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef tmp, tmp2; assert(!ctx->shader->is_gs_copy_shader); assert(info->num_outputs <= max_outputs); LLVMValueRef vertex_ptr = NULL; if (sel->so.num_outputs || sel->info.writes_edgeflag) vertex_ptr = ngg_nogs_vertex_ptr(ctx, get_thread_id_in_tg(ctx)); for (unsigned i = 0; i < info->num_outputs; i++) { outputs[i].semantic_name = info->output_semantic_name[i]; outputs[i].semantic_index = info->output_semantic_index[i]; for (unsigned j = 0; j < 4; j++) { outputs[i].vertex_stream[j] = (info->output_streams[i] >> (2 * j)) & 3; /* TODO: we may store more outputs than streamout needs, * but streamout performance isn't that important. */ if (sel->so.num_outputs) { tmp = ac_build_gep0(&ctx->ac, vertex_ptr, LLVMConstInt(ctx->i32, 4 * i + j, false)); tmp2 = LLVMBuildLoad(builder, addrs[4 * i + j], ""); tmp2 = ac_to_integer(&ctx->ac, tmp2); LLVMBuildStore(builder, tmp2, tmp); } } /* Store the edgeflag at the end (if streamout is enabled) */ if (info->output_semantic_name[i] == TGSI_SEMANTIC_EDGEFLAG && sel->info.writes_edgeflag) { LLVMValueRef edgeflag = LLVMBuildLoad(builder, addrs[4 * i], ""); /* The output is a float, but the hw expects a 1-bit integer. */ edgeflag = LLVMBuildFPToUI(ctx->ac.builder, edgeflag, ctx->i32, ""); edgeflag = ac_build_umin(&ctx->ac, edgeflag, ctx->i32_1); tmp = LLVMConstInt(ctx->i32, ngg_nogs_vertex_size(ctx->shader) - 1, 0); tmp = ac_build_gep0(&ctx->ac, vertex_ptr, tmp); LLVMBuildStore(builder, edgeflag, tmp); } } ac_build_endif(&ctx->ac, ctx->merged_wrap_if_label); LLVMValueRef is_gs_thread = si_is_gs_thread(ctx); LLVMValueRef is_es_thread = si_is_es_thread(ctx); LLVMValueRef vtxindex[] = { si_unpack_param(ctx, ctx->gs_vtx01_offset, 0, 16), si_unpack_param(ctx, ctx->gs_vtx01_offset, 16, 16), si_unpack_param(ctx, ctx->gs_vtx23_offset, 0, 16), }; /* Determine the number of vertices per primitive. */ unsigned num_vertices; LLVMValueRef num_vertices_val = ngg_get_vertices_per_prim(ctx, &num_vertices); /* Streamout */ LLVMValueRef emitted_prims = NULL; if (sel->so.num_outputs) { struct ngg_streamout nggso = {}; nggso.num_vertices = num_vertices_val; nggso.prim_enable[0] = is_gs_thread; for (unsigned i = 0; i < num_vertices; ++i) nggso.vertices[i] = ngg_nogs_vertex_ptr(ctx, vtxindex[i]); build_streamout(ctx, &nggso); emitted_prims = nggso.emit[0]; } LLVMValueRef user_edgeflags[3] = {}; if (sel->info.writes_edgeflag) { /* Streamout already inserted the barrier, so don't insert it again. */ if (!sel->so.num_outputs) ac_build_s_barrier(&ctx->ac); ac_build_ifcc(&ctx->ac, is_gs_thread, 5400); /* Load edge flags from ES threads and store them into VGPRs in GS threads. */ for (unsigned i = 0; i < num_vertices; i++) { tmp = ngg_nogs_vertex_ptr(ctx, vtxindex[i]); tmp2 = LLVMConstInt(ctx->i32, ngg_nogs_vertex_size(ctx->shader) - 1, 0); tmp = ac_build_gep0(&ctx->ac, tmp, tmp2); tmp = LLVMBuildLoad(builder, tmp, ""); tmp = LLVMBuildTrunc(builder, tmp, ctx->i1, ""); user_edgeflags[i] = ac_build_alloca_undef(&ctx->ac, ctx->i1, ""); LLVMBuildStore(builder, tmp, user_edgeflags[i]); } ac_build_endif(&ctx->ac, 5400); } /* Copy Primitive IDs from GS threads to the LDS address corresponding * to the ES thread of the provoking vertex. */ if (ctx->type == PIPE_SHADER_VERTEX && ctx->shader->key.mono.u.vs_export_prim_id) { /* Streamout and edge flags use LDS. Make it idle, so that we can reuse it. */ if (sel->so.num_outputs || sel->info.writes_edgeflag) ac_build_s_barrier(&ctx->ac); ac_build_ifcc(&ctx->ac, is_gs_thread, 5400); /* Extract the PROVOKING_VTX_INDEX field. */ LLVMValueRef provoking_vtx_in_prim = si_unpack_param(ctx, ctx->vs_state_bits, 4, 2); /* provoking_vtx_index = vtxindex[provoking_vtx_in_prim]; */ LLVMValueRef indices = ac_build_gather_values(&ctx->ac, vtxindex, 3); LLVMValueRef provoking_vtx_index = LLVMBuildExtractElement(builder, indices, provoking_vtx_in_prim, ""); LLVMValueRef vertex_ptr = ngg_nogs_vertex_ptr(ctx, provoking_vtx_index); LLVMBuildStore(builder, ac_get_arg(&ctx->ac, ctx->args.gs_prim_id), ac_build_gep0(&ctx->ac, vertex_ptr, ctx->i32_0)); ac_build_endif(&ctx->ac, 5400); } ac_build_sendmsg_gs_alloc_req(&ctx->ac, get_wave_id_in_tg(ctx), ngg_get_vtx_cnt(ctx), ngg_get_prim_cnt(ctx)); /* Update query buffer */ if (ctx->screen->use_ngg_streamout && !info->properties[TGSI_PROPERTY_VS_BLIT_SGPRS_AMD]) { tmp = si_unpack_param(ctx, ctx->vs_state_bits, 6, 1); tmp = LLVMBuildTrunc(builder, tmp, ctx->i1, ""); ac_build_ifcc(&ctx->ac, tmp, 5029); /* if (STREAMOUT_QUERY_ENABLED) */ tmp = LLVMBuildICmp(builder, LLVMIntEQ, get_wave_id_in_tg(ctx), ctx->ac.i32_0, ""); ac_build_ifcc(&ctx->ac, tmp, 5030); tmp = LLVMBuildICmp(builder, LLVMIntULE, ac_get_thread_id(&ctx->ac), sel->so.num_outputs ? ctx->ac.i32_1 : ctx->ac.i32_0, ""); ac_build_ifcc(&ctx->ac, tmp, 5031); { LLVMValueRef args[] = { ngg_get_prim_cnt(ctx), ngg_get_query_buf(ctx), LLVMConstInt(ctx->i32, 16, false), /* offset of stream[0].generated_primitives */ ctx->i32_0, /* soffset */ ctx->i32_0, /* cachepolicy */ }; if (sel->so.num_outputs) { args[0] = ac_build_writelane(&ctx->ac, args[0], emitted_prims, ctx->i32_1); args[2] = ac_build_writelane(&ctx->ac, args[2], LLVMConstInt(ctx->i32, 24, false), ctx->i32_1); } /* TODO: should this be 64-bit atomics? */ ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.raw.buffer.atomic.add.i32", ctx->i32, args, 5, 0); } ac_build_endif(&ctx->ac, 5031); ac_build_endif(&ctx->ac, 5030); ac_build_endif(&ctx->ac, 5029); } /* Build the primitive export. */ ac_build_ifcc(&ctx->ac, is_gs_thread, 6001); { struct ac_ngg_prim prim = {}; if (gfx10_is_ngg_passthrough(ctx->shader)) { prim.passthrough = ac_get_arg(&ctx->ac, ctx->gs_vtx01_offset); } else { prim.num_vertices = num_vertices; prim.isnull = ctx->ac.i1false; memcpy(prim.index, vtxindex, sizeof(vtxindex[0]) * 3); for (unsigned i = 0; i < num_vertices; ++i) { prim.edgeflag[i] = ngg_get_initial_edgeflag(ctx, i); if (sel->info.writes_edgeflag) { tmp2 = LLVMBuildLoad(builder, user_edgeflags[i], ""); prim.edgeflag[i] = LLVMBuildAnd(builder, prim.edgeflag[i], tmp2, ""); } } } ac_build_export_prim(&ctx->ac, &prim); } ac_build_endif(&ctx->ac, 6001); /* Export per-vertex data (positions and parameters). */ ac_build_ifcc(&ctx->ac, is_es_thread, 6002); { unsigned i; /* Unconditionally (re-)load the values for proper SSA form. */ for (i = 0; i < info->num_outputs; i++) { for (unsigned j = 0; j < 4; j++) { outputs[i].values[j] = LLVMBuildLoad(builder, addrs[4 * i + j], ""); } } if (ctx->shader->key.mono.u.vs_export_prim_id) { outputs[i].semantic_name = TGSI_SEMANTIC_PRIMID; outputs[i].semantic_index = 0; if (ctx->type == PIPE_SHADER_VERTEX) { /* Wait for GS stores to finish. */ ac_build_s_barrier(&ctx->ac); tmp = ngg_nogs_vertex_ptr(ctx, get_thread_id_in_tg(ctx)); tmp = ac_build_gep0(&ctx->ac, tmp, ctx->i32_0); outputs[i].values[0] = LLVMBuildLoad(builder, tmp, ""); } else { assert(ctx->type == PIPE_SHADER_TESS_EVAL); outputs[i].values[0] = si_get_primitive_id(ctx, 0); } outputs[i].values[0] = ac_to_float(&ctx->ac, outputs[i].values[0]); for (unsigned j = 1; j < 4; j++) outputs[i].values[j] = LLVMGetUndef(ctx->f32); memset(outputs[i].vertex_stream, 0, sizeof(outputs[i].vertex_stream)); i++; } si_llvm_export_vs(ctx, outputs, i); } ac_build_endif(&ctx->ac, 6002); } static LLVMValueRef ngg_gs_get_vertex_storage(struct si_shader_context *ctx) { const struct si_shader_selector *sel = ctx->shader->selector; const struct si_shader_info *info = &sel->info; LLVMTypeRef elements[2] = { LLVMArrayType(ctx->ac.i32, 4 * info->num_outputs), LLVMArrayType(ctx->ac.i8, 4), }; LLVMTypeRef type = LLVMStructTypeInContext(ctx->ac.context, elements, 2, false); type = LLVMPointerType(LLVMArrayType(type, 0), AC_ADDR_SPACE_LDS); return LLVMBuildBitCast(ctx->ac.builder, ctx->gs_ngg_emit, type, ""); } /** * Return a pointer to the LDS storage reserved for the N'th vertex, where N * is in emit order; that is: * - during the epilogue, N is the threadidx (relative to the entire threadgroup) * - during vertex emit, i.e. while the API GS shader invocation is running, * N = threadidx * gs_max_out_vertices + emitidx * * Goals of the LDS memory layout: * 1. Eliminate bank conflicts on write for geometry shaders that have all emits * in uniform control flow * 2. Eliminate bank conflicts on read for export if, additionally, there is no * culling * 3. Agnostic to the number of waves (since we don't know it before compiling) * 4. Allow coalescing of LDS instructions (ds_write_b128 etc.) * 5. Avoid wasting memory. * * We use an AoS layout due to point 4 (this also helps point 3). In an AoS * layout, elimination of bank conflicts requires that each vertex occupy an * odd number of dwords. We use the additional dword to store the output stream * index as well as a flag to indicate whether this vertex ends a primitive * for rasterization. * * Swizzling is required to satisfy points 1 and 2 simultaneously. * * Vertices are stored in export order (gsthread * gs_max_out_vertices + emitidx). * Indices are swizzled in groups of 32, which ensures point 1 without * disturbing point 2. * * \return an LDS pointer to type {[N x i32], [4 x i8]} */ static LLVMValueRef ngg_gs_vertex_ptr(struct si_shader_context *ctx, LLVMValueRef vertexidx) { struct si_shader_selector *sel = ctx->shader->selector; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef storage = ngg_gs_get_vertex_storage(ctx); /* gs_max_out_vertices = 2^(write_stride_2exp) * some odd number */ unsigned write_stride_2exp = ffs(sel->gs_max_out_vertices) - 1; if (write_stride_2exp) { LLVMValueRef row = LLVMBuildLShr(builder, vertexidx, LLVMConstInt(ctx->ac.i32, 5, false), ""); LLVMValueRef swizzle = LLVMBuildAnd(builder, row, LLVMConstInt(ctx->ac.i32, (1u << write_stride_2exp) - 1, false), ""); vertexidx = LLVMBuildXor(builder, vertexidx, swizzle, ""); } return ac_build_gep0(&ctx->ac, storage, vertexidx); } static LLVMValueRef ngg_gs_emit_vertex_ptr(struct si_shader_context *ctx, LLVMValueRef gsthread, LLVMValueRef emitidx) { struct si_shader_selector *sel = ctx->shader->selector; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef tmp; tmp = LLVMConstInt(ctx->ac.i32, sel->gs_max_out_vertices, false); tmp = LLVMBuildMul(builder, tmp, gsthread, ""); const LLVMValueRef vertexidx = LLVMBuildAdd(builder, tmp, emitidx, ""); return ngg_gs_vertex_ptr(ctx, vertexidx); } static LLVMValueRef ngg_gs_get_emit_output_ptr(struct si_shader_context *ctx, LLVMValueRef vertexptr, unsigned out_idx) { LLVMValueRef gep_idx[3] = { ctx->ac.i32_0, /* implied C-style array */ ctx->ac.i32_0, /* first struct entry */ LLVMConstInt(ctx->ac.i32, out_idx, false), }; return LLVMBuildGEP(ctx->ac.builder, vertexptr, gep_idx, 3, ""); } static LLVMValueRef ngg_gs_get_emit_primflag_ptr(struct si_shader_context *ctx, LLVMValueRef vertexptr, unsigned stream) { LLVMValueRef gep_idx[3] = { ctx->ac.i32_0, /* implied C-style array */ ctx->ac.i32_1, /* second struct entry */ LLVMConstInt(ctx->ac.i32, stream, false), }; return LLVMBuildGEP(ctx->ac.builder, vertexptr, gep_idx, 3, ""); } void gfx10_ngg_gs_emit_vertex(struct si_shader_context *ctx, unsigned stream, LLVMValueRef *addrs) { const struct si_shader_selector *sel = ctx->shader->selector; const struct si_shader_info *info = &sel->info; LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef tmp; const LLVMValueRef vertexidx = LLVMBuildLoad(builder, ctx->gs_next_vertex[stream], ""); /* If this thread has already emitted the declared maximum number of * vertices, skip the write: excessive vertex emissions are not * supposed to have any effect. */ const LLVMValueRef can_emit = LLVMBuildICmp(builder, LLVMIntULT, vertexidx, LLVMConstInt(ctx->i32, sel->gs_max_out_vertices, false), ""); tmp = LLVMBuildAdd(builder, vertexidx, ctx->ac.i32_1, ""); tmp = LLVMBuildSelect(builder, can_emit, tmp, vertexidx, ""); LLVMBuildStore(builder, tmp, ctx->gs_next_vertex[stream]); ac_build_ifcc(&ctx->ac, can_emit, 9001); const LLVMValueRef vertexptr = ngg_gs_emit_vertex_ptr(ctx, get_thread_id_in_tg(ctx), vertexidx); unsigned out_idx = 0; for (unsigned i = 0; i < info->num_outputs; i++) { for (unsigned chan = 0; chan < 4; chan++, out_idx++) { if (!(info->output_usagemask[i] & (1 << chan)) || ((info->output_streams[i] >> (2 * chan)) & 3) != stream) continue; LLVMValueRef out_val = LLVMBuildLoad(builder, addrs[4 * i + chan], ""); out_val = ac_to_integer(&ctx->ac, out_val); LLVMBuildStore(builder, out_val, ngg_gs_get_emit_output_ptr(ctx, vertexptr, out_idx)); } } assert(out_idx * 4 == sel->gsvs_vertex_size); /* Determine and store whether this vertex completed a primitive. */ const LLVMValueRef curverts = LLVMBuildLoad(builder, ctx->gs_curprim_verts[stream], ""); tmp = LLVMConstInt(ctx->ac.i32, u_vertices_per_prim(sel->gs_output_prim) - 1, false); const LLVMValueRef iscompleteprim = LLVMBuildICmp(builder, LLVMIntUGE, curverts, tmp, ""); /* Since the geometry shader emits triangle strips, we need to * track which primitive is odd and swap vertex indices to get * the correct vertex order. */ LLVMValueRef is_odd = ctx->i1false; if (stream == 0 && u_vertices_per_prim(sel->gs_output_prim) == 3) { tmp = LLVMBuildAnd(builder, curverts, ctx->i32_1, ""); is_odd = LLVMBuildICmp(builder, LLVMIntEQ, tmp, ctx->i32_1, ""); } tmp = LLVMBuildAdd(builder, curverts, ctx->ac.i32_1, ""); LLVMBuildStore(builder, tmp, ctx->gs_curprim_verts[stream]); /* The per-vertex primitive flag encoding: * bit 0: whether this vertex finishes a primitive * bit 1: whether the primitive is odd (if we are emitting triangle strips) */ tmp = LLVMBuildZExt(builder, iscompleteprim, ctx->ac.i8, ""); tmp = LLVMBuildOr(builder, tmp, LLVMBuildShl(builder, LLVMBuildZExt(builder, is_odd, ctx->ac.i8, ""), ctx->ac.i8_1, ""), ""); LLVMBuildStore(builder, tmp, ngg_gs_get_emit_primflag_ptr(ctx, vertexptr, stream)); tmp = LLVMBuildLoad(builder, ctx->gs_generated_prims[stream], ""); tmp = LLVMBuildAdd(builder, tmp, LLVMBuildZExt(builder, iscompleteprim, ctx->ac.i32, ""), ""); LLVMBuildStore(builder, tmp, ctx->gs_generated_prims[stream]); ac_build_endif(&ctx->ac, 9001); } void gfx10_ngg_gs_emit_prologue(struct si_shader_context *ctx) { /* Zero out the part of LDS scratch that is used to accumulate the * per-stream generated primitive count. */ LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef scratchptr = ctx->gs_ngg_scratch; LLVMValueRef tid = get_thread_id_in_tg(ctx); LLVMValueRef tmp; tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, LLVMConstInt(ctx->i32, 4, false), ""); ac_build_ifcc(&ctx->ac, tmp, 5090); { LLVMValueRef ptr = ac_build_gep0(&ctx->ac, scratchptr, tid); LLVMBuildStore(builder, ctx->i32_0, ptr); } ac_build_endif(&ctx->ac, 5090); ac_build_s_barrier(&ctx->ac); } void gfx10_ngg_gs_emit_epilogue(struct si_shader_context *ctx) { const struct si_shader_selector *sel = ctx->shader->selector; const struct si_shader_info *info = &sel->info; const unsigned verts_per_prim = u_vertices_per_prim(sel->gs_output_prim); LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef i8_0 = LLVMConstInt(ctx->ac.i8, 0, false); LLVMValueRef tmp, tmp2; /* Zero out remaining (non-emitted) primitive flags. * * Note: Alternatively, we could pass the relevant gs_next_vertex to * the emit threads via LDS. This is likely worse in the expected * typical case where each GS thread emits the full set of * vertices. */ for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; const LLVMValueRef gsthread = get_thread_id_in_tg(ctx); ac_build_bgnloop(&ctx->ac, 5100); const LLVMValueRef vertexidx = LLVMBuildLoad(builder, ctx->gs_next_vertex[stream], ""); tmp = LLVMBuildICmp(builder, LLVMIntUGE, vertexidx, LLVMConstInt(ctx->ac.i32, sel->gs_max_out_vertices, false), ""); ac_build_ifcc(&ctx->ac, tmp, 5101); ac_build_break(&ctx->ac); ac_build_endif(&ctx->ac, 5101); tmp = LLVMBuildAdd(builder, vertexidx, ctx->ac.i32_1, ""); LLVMBuildStore(builder, tmp, ctx->gs_next_vertex[stream]); tmp = ngg_gs_emit_vertex_ptr(ctx, gsthread, vertexidx); LLVMBuildStore(builder, i8_0, ngg_gs_get_emit_primflag_ptr(ctx, tmp, stream)); ac_build_endloop(&ctx->ac, 5100); } /* Accumulate generated primitives counts across the entire threadgroup. */ for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; LLVMValueRef numprims = LLVMBuildLoad(builder, ctx->gs_generated_prims[stream], ""); numprims = ac_build_reduce(&ctx->ac, numprims, nir_op_iadd, ctx->ac.wave_size); tmp = LLVMBuildICmp(builder, LLVMIntEQ, ac_get_thread_id(&ctx->ac), ctx->i32_0, ""); ac_build_ifcc(&ctx->ac, tmp, 5105); { LLVMBuildAtomicRMW(builder, LLVMAtomicRMWBinOpAdd, ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, LLVMConstInt(ctx->i32, stream, false)), numprims, LLVMAtomicOrderingMonotonic, false); } ac_build_endif(&ctx->ac, 5105); } ac_build_endif(&ctx->ac, ctx->merged_wrap_if_label); ac_build_s_barrier(&ctx->ac); const LLVMValueRef tid = get_thread_id_in_tg(ctx); LLVMValueRef num_emit_threads = ngg_get_prim_cnt(ctx); /* Streamout */ if (sel->so.num_outputs) { struct ngg_streamout nggso = {}; nggso.num_vertices = LLVMConstInt(ctx->i32, verts_per_prim, false); LLVMValueRef vertexptr = ngg_gs_vertex_ptr(ctx, tid); for (unsigned stream = 0; stream < 4; ++stream) { if (!info->num_stream_output_components[stream]) continue; tmp = LLVMBuildLoad(builder, ngg_gs_get_emit_primflag_ptr(ctx, vertexptr, stream), ""); tmp = LLVMBuildTrunc(builder, tmp, ctx->i1, ""); tmp2 = LLVMBuildICmp(builder, LLVMIntULT, tid, num_emit_threads, ""); nggso.prim_enable[stream] = LLVMBuildAnd(builder, tmp, tmp2, ""); } for (unsigned i = 0; i < verts_per_prim; ++i) { tmp = LLVMBuildSub(builder, tid, LLVMConstInt(ctx->i32, verts_per_prim - i - 1, false), ""); tmp = ngg_gs_vertex_ptr(ctx, tmp); nggso.vertices[i] = ac_build_gep0(&ctx->ac, tmp, ctx->i32_0); } build_streamout(ctx, &nggso); } /* Write shader query data. */ if (ctx->screen->use_ngg_streamout) { tmp = si_unpack_param(ctx, ctx->vs_state_bits, 6, 1); tmp = LLVMBuildTrunc(builder, tmp, ctx->i1, ""); ac_build_ifcc(&ctx->ac, tmp, 5109); /* if (STREAMOUT_QUERY_ENABLED) */ unsigned num_query_comps = sel->so.num_outputs ? 8 : 4; tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, LLVMConstInt(ctx->i32, num_query_comps, false), ""); ac_build_ifcc(&ctx->ac, tmp, 5110); { LLVMValueRef offset; tmp = tid; if (sel->so.num_outputs) tmp = LLVMBuildAnd(builder, tmp, LLVMConstInt(ctx->i32, 3, false), ""); offset = LLVMBuildNUWMul(builder, tmp, LLVMConstInt(ctx->i32, 32, false), ""); if (sel->so.num_outputs) { tmp = LLVMBuildLShr(builder, tid, LLVMConstInt(ctx->i32, 2, false), ""); tmp = LLVMBuildNUWMul(builder, tmp, LLVMConstInt(ctx->i32, 8, false), ""); offset = LLVMBuildAdd(builder, offset, tmp, ""); } tmp = LLVMBuildLoad(builder, ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, tid), ""); LLVMValueRef args[] = { tmp, ngg_get_query_buf(ctx), offset, LLVMConstInt(ctx->i32, 16, false), /* soffset */ ctx->i32_0, /* cachepolicy */ }; ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.raw.buffer.atomic.add.i32", ctx->i32, args, 5, 0); } ac_build_endif(&ctx->ac, 5110); ac_build_endif(&ctx->ac, 5109); } /* Determine vertex liveness. */ LLVMValueRef vertliveptr = ac_build_alloca(&ctx->ac, ctx->ac.i1, "vertexlive"); tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, num_emit_threads, ""); ac_build_ifcc(&ctx->ac, tmp, 5120); { for (unsigned i = 0; i < verts_per_prim; ++i) { const LLVMValueRef primidx = LLVMBuildAdd(builder, tid, LLVMConstInt(ctx->ac.i32, i, false), ""); if (i > 0) { tmp = LLVMBuildICmp(builder, LLVMIntULT, primidx, num_emit_threads, ""); ac_build_ifcc(&ctx->ac, tmp, 5121 + i); } /* Load primitive liveness */ tmp = ngg_gs_vertex_ptr(ctx, primidx); tmp = LLVMBuildLoad(builder, ngg_gs_get_emit_primflag_ptr(ctx, tmp, 0), ""); const LLVMValueRef primlive = LLVMBuildTrunc(builder, tmp, ctx->ac.i1, ""); tmp = LLVMBuildLoad(builder, vertliveptr, ""); tmp = LLVMBuildOr(builder, tmp, primlive, ""), LLVMBuildStore(builder, tmp, vertliveptr); if (i > 0) ac_build_endif(&ctx->ac, 5121 + i); } } ac_build_endif(&ctx->ac, 5120); /* Inclusive scan addition across the current wave. */ LLVMValueRef vertlive = LLVMBuildLoad(builder, vertliveptr, ""); struct ac_wg_scan vertlive_scan = {}; vertlive_scan.op = nir_op_iadd; vertlive_scan.enable_reduce = true; vertlive_scan.enable_exclusive = true; vertlive_scan.src = vertlive; vertlive_scan.scratch = ac_build_gep0(&ctx->ac, ctx->gs_ngg_scratch, ctx->i32_0); vertlive_scan.waveidx = get_wave_id_in_tg(ctx); vertlive_scan.numwaves = get_tgsize(ctx); vertlive_scan.maxwaves = 8; ac_build_wg_scan(&ctx->ac, &vertlive_scan); /* Skip all exports (including index exports) when possible. At least on * early gfx10 revisions this is also to avoid hangs. */ LLVMValueRef have_exports = LLVMBuildICmp(builder, LLVMIntNE, vertlive_scan.result_reduce, ctx->ac.i32_0, ""); num_emit_threads = LLVMBuildSelect(builder, have_exports, num_emit_threads, ctx->ac.i32_0, ""); /* Allocate export space. Send this message as early as possible, to * hide the latency of the SQ <-> SPI roundtrip. * * Note: We could consider compacting primitives for export as well. * PA processes 1 non-null prim / clock, but it fetches 4 DW of * prim data per clock and skips null primitives at no additional * cost. So compacting primitives can only be beneficial when * there are 4 or more contiguous null primitives in the export * (in the common case of single-dword prim exports). */ ac_build_sendmsg_gs_alloc_req(&ctx->ac, get_wave_id_in_tg(ctx), vertlive_scan.result_reduce, num_emit_threads); /* Setup the reverse vertex compaction permutation. We re-use stream 1 * of the primitive liveness flags, relying on the fact that each * threadgroup can have at most 256 threads. */ ac_build_ifcc(&ctx->ac, vertlive, 5130); { tmp = ngg_gs_vertex_ptr(ctx, vertlive_scan.result_exclusive); tmp2 = LLVMBuildTrunc(builder, tid, ctx->ac.i8, ""); LLVMBuildStore(builder, tmp2, ngg_gs_get_emit_primflag_ptr(ctx, tmp, 1)); } ac_build_endif(&ctx->ac, 5130); ac_build_s_barrier(&ctx->ac); /* Export primitive data */ tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, num_emit_threads, ""); ac_build_ifcc(&ctx->ac, tmp, 5140); { LLVMValueRef flags; struct ac_ngg_prim prim = {}; prim.num_vertices = verts_per_prim; tmp = ngg_gs_vertex_ptr(ctx, tid); flags = LLVMBuildLoad(builder, ngg_gs_get_emit_primflag_ptr(ctx, tmp, 0), ""); prim.isnull = LLVMBuildNot(builder, LLVMBuildTrunc(builder, flags, ctx->i1, ""), ""); for (unsigned i = 0; i < verts_per_prim; ++i) { prim.index[i] = LLVMBuildSub(builder, vertlive_scan.result_exclusive, LLVMConstInt(ctx->ac.i32, verts_per_prim - i - 1, false), ""); prim.edgeflag[i] = ctx->ac.i1false; } /* Geometry shaders output triangle strips, but NGG expects triangles. * We need to change the vertex order for odd triangles to get correct * front/back facing by swapping 2 vertex indices, but we also have to * keep the provoking vertex in the same place. * * If the first vertex is provoking, swap index 1 and 2. * If the last vertex is provoking, swap index 0 and 1. */ if (verts_per_prim == 3) { LLVMValueRef is_odd = LLVMBuildLShr(builder, flags, ctx->ac.i8_1, ""); is_odd = LLVMBuildTrunc(builder, is_odd, ctx->i1, ""); LLVMValueRef flatshade_first = LLVMBuildICmp(builder, LLVMIntEQ, si_unpack_param(ctx, ctx->vs_state_bits, 4, 2), ctx->i32_0, ""); struct ac_ngg_prim in = prim; prim.index[0] = LLVMBuildSelect(builder, flatshade_first, in.index[0], LLVMBuildSelect(builder, is_odd, in.index[1], in.index[0], ""), ""); prim.index[1] = LLVMBuildSelect(builder, flatshade_first, LLVMBuildSelect(builder, is_odd, in.index[2], in.index[1], ""), LLVMBuildSelect(builder, is_odd, in.index[0], in.index[1], ""), ""); prim.index[2] = LLVMBuildSelect(builder, flatshade_first, LLVMBuildSelect(builder, is_odd, in.index[1], in.index[2], ""), in.index[2], ""); } ac_build_export_prim(&ctx->ac, &prim); } ac_build_endif(&ctx->ac, 5140); /* Export position and parameter data */ tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, vertlive_scan.result_reduce, ""); ac_build_ifcc(&ctx->ac, tmp, 5145); { struct si_shader_output_values outputs[PIPE_MAX_SHADER_OUTPUTS]; tmp = ngg_gs_vertex_ptr(ctx, tid); tmp = LLVMBuildLoad(builder, ngg_gs_get_emit_primflag_ptr(ctx, tmp, 1), ""); tmp = LLVMBuildZExt(builder, tmp, ctx->ac.i32, ""); const LLVMValueRef vertexptr = ngg_gs_vertex_ptr(ctx, tmp); unsigned out_idx = 0; for (unsigned i = 0; i < info->num_outputs; i++) { outputs[i].semantic_name = info->output_semantic_name[i]; outputs[i].semantic_index = info->output_semantic_index[i]; for (unsigned j = 0; j < 4; j++, out_idx++) { tmp = ngg_gs_get_emit_output_ptr(ctx, vertexptr, out_idx); tmp = LLVMBuildLoad(builder, tmp, ""); outputs[i].values[j] = ac_to_float(&ctx->ac, tmp); outputs[i].vertex_stream[j] = (info->output_streams[i] >> (2 * j)) & 3; } } si_llvm_export_vs(ctx, outputs, info->num_outputs); } ac_build_endif(&ctx->ac, 5145); } static void clamp_gsprims_to_esverts(unsigned *max_gsprims, unsigned max_esverts, unsigned min_verts_per_prim, bool use_adjacency) { unsigned max_reuse = max_esverts - min_verts_per_prim; if (use_adjacency) max_reuse /= 2; *max_gsprims = MIN2(*max_gsprims, 1 + max_reuse); } /** * Determine subgroup information like maximum number of vertices and prims. * * This happens before the shader is uploaded, since LDS relocations during * upload depend on the subgroup size. */ void gfx10_ngg_calculate_subgroup_info(struct si_shader *shader) { const struct si_shader_selector *gs_sel = shader->selector; const struct si_shader_selector *es_sel = shader->previous_stage_sel ? shader->previous_stage_sel : gs_sel; const enum pipe_shader_type gs_type = gs_sel->type; const unsigned gs_num_invocations = MAX2(gs_sel->gs_num_invocations, 1); const unsigned input_prim = si_get_input_prim(gs_sel); const bool use_adjacency = input_prim >= PIPE_PRIM_LINES_ADJACENCY && input_prim <= PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY; const unsigned max_verts_per_prim = u_vertices_per_prim(input_prim); const unsigned min_verts_per_prim = gs_type == PIPE_SHADER_GEOMETRY ? max_verts_per_prim : 1; /* All these are in dwords: */ /* We can't allow using the whole LDS, because GS waves compete with * other shader stages for LDS space. * * TODO: We should really take the shader's internal LDS use into * account. The linker will fail if the size is greater than * 8K dwords. */ const unsigned max_lds_size = 8 * 1024 - 768; const unsigned target_lds_size = max_lds_size; unsigned esvert_lds_size = 0; unsigned gsprim_lds_size = 0; /* All these are per subgroup: */ bool max_vert_out_per_gs_instance = false; unsigned max_esverts_base = 128; unsigned max_gsprims_base = 128; /* default prim group size clamp */ /* Hardware has the following non-natural restrictions on the value * of GE_CNTL.VERT_GRP_SIZE based on based on the primitive type of * the draw: * - at most 252 for any line input primitive type * - at most 251 for any quad input primitive type * - at most 251 for triangle strips with adjacency (this happens to * be the natural limit for triangle *lists* with adjacency) */ max_esverts_base = MIN2(max_esverts_base, 251 + max_verts_per_prim - 1); if (gs_type == PIPE_SHADER_GEOMETRY) { unsigned max_out_verts_per_gsprim = gs_sel->gs_max_out_vertices * gs_num_invocations; if (max_out_verts_per_gsprim <= 256) { if (max_out_verts_per_gsprim) { max_gsprims_base = MIN2(max_gsprims_base, 256 / max_out_verts_per_gsprim); } } else { /* Use special multi-cycling mode in which each GS * instance gets its own subgroup. Does not work with * tessellation. */ max_vert_out_per_gs_instance = true; max_gsprims_base = 1; max_out_verts_per_gsprim = gs_sel->gs_max_out_vertices; } esvert_lds_size = es_sel->esgs_itemsize / 4; gsprim_lds_size = (gs_sel->gsvs_vertex_size / 4 + 1) * max_out_verts_per_gsprim; } else { /* VS and TES. */ /* LDS size for passing data from ES to GS. */ esvert_lds_size = ngg_nogs_vertex_size(shader); } unsigned max_gsprims = max_gsprims_base; unsigned max_esverts = max_esverts_base; if (esvert_lds_size) max_esverts = MIN2(max_esverts, target_lds_size / esvert_lds_size); if (gsprim_lds_size) max_gsprims = MIN2(max_gsprims, target_lds_size / gsprim_lds_size); max_esverts = MIN2(max_esverts, max_gsprims * max_verts_per_prim); clamp_gsprims_to_esverts(&max_gsprims, max_esverts, min_verts_per_prim, use_adjacency); assert(max_esverts >= max_verts_per_prim && max_gsprims >= 1); if (esvert_lds_size || gsprim_lds_size) { /* Now that we have a rough proportionality between esverts * and gsprims based on the primitive type, scale both of them * down simultaneously based on required LDS space. * * We could be smarter about this if we knew how much vertex * reuse to expect. */ unsigned lds_total = max_esverts * esvert_lds_size + max_gsprims * gsprim_lds_size; if (lds_total > target_lds_size) { max_esverts = max_esverts * target_lds_size / lds_total; max_gsprims = max_gsprims * target_lds_size / lds_total; max_esverts = MIN2(max_esverts, max_gsprims * max_verts_per_prim); clamp_gsprims_to_esverts(&max_gsprims, max_esverts, min_verts_per_prim, use_adjacency); assert(max_esverts >= max_verts_per_prim && max_gsprims >= 1); } } /* Round up towards full wave sizes for better ALU utilization. */ if (!max_vert_out_per_gs_instance) { const unsigned wavesize = gs_sel->screen->ge_wave_size; unsigned orig_max_esverts; unsigned orig_max_gsprims; do { orig_max_esverts = max_esverts; orig_max_gsprims = max_gsprims; max_esverts = align(max_esverts, wavesize); max_esverts = MIN2(max_esverts, max_esverts_base); if (esvert_lds_size) max_esverts = MIN2(max_esverts, (max_lds_size - max_gsprims * gsprim_lds_size) / esvert_lds_size); max_esverts = MIN2(max_esverts, max_gsprims * max_verts_per_prim); max_gsprims = align(max_gsprims, wavesize); max_gsprims = MIN2(max_gsprims, max_gsprims_base); if (gsprim_lds_size) max_gsprims = MIN2(max_gsprims, (max_lds_size - max_esverts * esvert_lds_size) / gsprim_lds_size); clamp_gsprims_to_esverts(&max_gsprims, max_esverts, min_verts_per_prim, use_adjacency); assert(max_esverts >= max_verts_per_prim && max_gsprims >= 1); } while (orig_max_esverts != max_esverts || orig_max_gsprims != max_gsprims); } /* Hardware restriction: minimum value of max_esverts */ max_esverts = MAX2(max_esverts, 23 + max_verts_per_prim); unsigned max_out_vertices = max_vert_out_per_gs_instance ? gs_sel->gs_max_out_vertices : gs_type == PIPE_SHADER_GEOMETRY ? max_gsprims * gs_num_invocations * gs_sel->gs_max_out_vertices : max_esverts; assert(max_out_vertices <= 256); unsigned prim_amp_factor = 1; if (gs_type == PIPE_SHADER_GEOMETRY) { /* Number of output primitives per GS input primitive after * GS instancing. */ prim_amp_factor = gs_sel->gs_max_out_vertices; } /* The GE only checks against the maximum number of ES verts after * allocating a full GS primitive. So we need to ensure that whenever * this check passes, there is enough space for a full primitive without * vertex reuse. */ shader->ngg.hw_max_esverts = max_esverts - max_verts_per_prim + 1; shader->ngg.max_gsprims = max_gsprims; shader->ngg.max_out_verts = max_out_vertices; shader->ngg.prim_amp_factor = prim_amp_factor; shader->ngg.max_vert_out_per_gs_instance = max_vert_out_per_gs_instance; shader->gs_info.esgs_ring_size = 4 * max_esverts * esvert_lds_size; shader->ngg.ngg_emit_size = max_gsprims * gsprim_lds_size; assert(shader->ngg.hw_max_esverts >= 24); /* HW limitation */ }