/* * Copyright 2020 Advanced Micro Devices, Inc. * All Rights Reserved. * * 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" /** * Return a value that is equal to the given i32 \p index if it lies in [0,num) * or an undefined value in the same interval otherwise. */ static LLVMValueRef si_llvm_bound_index(struct si_shader_context *ctx, LLVMValueRef index, unsigned num) { LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef c_max = LLVMConstInt(ctx->ac.i32, num - 1, 0); LLVMValueRef cc; if (util_is_power_of_two_or_zero(num)) { index = LLVMBuildAnd(builder, index, c_max, ""); } else { /* In theory, this MAX pattern should result in code that is * as good as the bit-wise AND above. * * In practice, LLVM generates worse code (at the time of * writing), because its value tracking is not strong enough. */ cc = LLVMBuildICmp(builder, LLVMIntULE, index, c_max, ""); index = LLVMBuildSelect(builder, cc, index, c_max, ""); } return index; } static LLVMValueRef load_const_buffer_desc_fast_path(struct si_shader_context *ctx) { LLVMValueRef ptr = ac_get_arg(&ctx->ac, ctx->const_and_shader_buffers); struct si_shader_selector *sel = ctx->shader->selector; /* Do the bounds checking with a descriptor, because * doing computation and manual bounds checking of 64-bit * addresses generates horrible VALU code with very high * VGPR usage and very low SIMD occupancy. */ ptr = LLVMBuildPtrToInt(ctx->ac.builder, ptr, ctx->ac.intptr, ""); LLVMValueRef desc0, desc1; desc0 = ptr; desc1 = LLVMConstInt(ctx->ac.i32, S_008F04_BASE_ADDRESS_HI(ctx->screen->info.address32_hi), 0); uint32_t rsrc3 = S_008F0C_DST_SEL_X(V_008F0C_SQ_SEL_X) | S_008F0C_DST_SEL_Y(V_008F0C_SQ_SEL_Y) | S_008F0C_DST_SEL_Z(V_008F0C_SQ_SEL_Z) | S_008F0C_DST_SEL_W(V_008F0C_SQ_SEL_W); if (ctx->screen->info.chip_class >= GFX10) rsrc3 |= S_008F0C_FORMAT(V_008F0C_IMG_FORMAT_32_FLOAT) | S_008F0C_OOB_SELECT(V_008F0C_OOB_SELECT_RAW) | S_008F0C_RESOURCE_LEVEL(1); else rsrc3 |= S_008F0C_NUM_FORMAT(V_008F0C_BUF_NUM_FORMAT_FLOAT) | S_008F0C_DATA_FORMAT(V_008F0C_BUF_DATA_FORMAT_32); LLVMValueRef desc_elems[] = {desc0, desc1, LLVMConstInt(ctx->ac.i32, sel->info.constbuf0_num_slots * 16, 0), LLVMConstInt(ctx->ac.i32, rsrc3, false)}; return ac_build_gather_values(&ctx->ac, desc_elems, 4); } static LLVMValueRef load_ubo(struct ac_shader_abi *abi, LLVMValueRef index) { struct si_shader_context *ctx = si_shader_context_from_abi(abi); struct si_shader_selector *sel = ctx->shader->selector; LLVMValueRef ptr = ac_get_arg(&ctx->ac, ctx->const_and_shader_buffers); if (sel->info.const_buffers_declared == 1 && sel->info.shader_buffers_declared == 0) { return load_const_buffer_desc_fast_path(ctx); } index = si_llvm_bound_index(ctx, index, ctx->num_const_buffers); index = LLVMBuildAdd(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i32, SI_NUM_SHADER_BUFFERS, 0), ""); return ac_build_load_to_sgpr(&ctx->ac, ptr, index); } static LLVMValueRef load_ssbo(struct ac_shader_abi *abi, LLVMValueRef index, bool write) { struct si_shader_context *ctx = si_shader_context_from_abi(abi); LLVMValueRef rsrc_ptr = ac_get_arg(&ctx->ac, ctx->const_and_shader_buffers); index = si_llvm_bound_index(ctx, index, ctx->num_shader_buffers); index = LLVMBuildSub(ctx->ac.builder, LLVMConstInt(ctx->ac.i32, SI_NUM_SHADER_BUFFERS - 1, 0), index, ""); return ac_build_load_to_sgpr(&ctx->ac, rsrc_ptr, index); } /** * Given a 256-bit resource descriptor, force the DCC enable bit to off. * * At least on Tonga, executing image stores on images with DCC enabled and * non-trivial can eventually lead to lockups. This can occur when an * application binds an image as read-only but then uses a shader that writes * to it. The OpenGL spec allows almost arbitrarily bad behavior (including * program termination) in this case, but it doesn't cost much to be a bit * nicer: disabling DCC in the shader still leads to undefined results but * avoids the lockup. */ static LLVMValueRef force_dcc_off(struct si_shader_context *ctx, LLVMValueRef rsrc) { if (ctx->screen->info.chip_class <= GFX7) { return rsrc; } else { LLVMValueRef i32_6 = LLVMConstInt(ctx->ac.i32, 6, 0); LLVMValueRef i32_C = LLVMConstInt(ctx->ac.i32, C_008F28_COMPRESSION_EN, 0); LLVMValueRef tmp; tmp = LLVMBuildExtractElement(ctx->ac.builder, rsrc, i32_6, ""); tmp = LLVMBuildAnd(ctx->ac.builder, tmp, i32_C, ""); return LLVMBuildInsertElement(ctx->ac.builder, rsrc, tmp, i32_6, ""); } } /* AC_DESC_FMASK is handled exactly like AC_DESC_IMAGE. The caller should * adjust "index" to point to FMASK. */ static LLVMValueRef si_load_image_desc(struct si_shader_context *ctx, LLVMValueRef list, LLVMValueRef index, enum ac_descriptor_type desc_type, bool uses_store, bool bindless) { LLVMBuilderRef builder = ctx->ac.builder; LLVMValueRef rsrc; if (desc_type == AC_DESC_BUFFER) { index = ac_build_imad(&ctx->ac, index, LLVMConstInt(ctx->ac.i32, 2, 0), ctx->ac.i32_1); list = LLVMBuildPointerCast(builder, list, ac_array_in_const32_addr_space(ctx->ac.v4i32), ""); } else { assert(desc_type == AC_DESC_IMAGE || desc_type == AC_DESC_FMASK); } if (bindless) rsrc = ac_build_load_to_sgpr_uint_wraparound(&ctx->ac, list, index); else rsrc = ac_build_load_to_sgpr(&ctx->ac, list, index); if (desc_type == AC_DESC_IMAGE && uses_store) rsrc = force_dcc_off(ctx, rsrc); return rsrc; } /** * Load an image view, fmask view. or sampler state descriptor. */ static LLVMValueRef si_load_sampler_desc(struct si_shader_context *ctx, LLVMValueRef list, LLVMValueRef index, enum ac_descriptor_type type) { LLVMBuilderRef builder = ctx->ac.builder; switch (type) { case AC_DESC_IMAGE: /* The image is at [0:7]. */ index = LLVMBuildMul(builder, index, LLVMConstInt(ctx->ac.i32, 2, 0), ""); break; case AC_DESC_BUFFER: /* The buffer is in [4:7]. */ index = ac_build_imad(&ctx->ac, index, LLVMConstInt(ctx->ac.i32, 4, 0), ctx->ac.i32_1); list = LLVMBuildPointerCast(builder, list, ac_array_in_const32_addr_space(ctx->ac.v4i32), ""); break; case AC_DESC_FMASK: /* The FMASK is at [8:15]. */ index = ac_build_imad(&ctx->ac, index, LLVMConstInt(ctx->ac.i32, 2, 0), ctx->ac.i32_1); break; case AC_DESC_SAMPLER: /* The sampler state is at [12:15]. */ index = ac_build_imad(&ctx->ac, index, LLVMConstInt(ctx->ac.i32, 4, 0), LLVMConstInt(ctx->ac.i32, 3, 0)); list = LLVMBuildPointerCast(builder, list, ac_array_in_const32_addr_space(ctx->ac.v4i32), ""); break; case AC_DESC_PLANE_0: case AC_DESC_PLANE_1: case AC_DESC_PLANE_2: /* Only used for the multiplane image support for Vulkan. Should * never be reached in radeonsi. */ unreachable("Plane descriptor requested in radeonsi."); } return ac_build_load_to_sgpr(&ctx->ac, list, index); } static LLVMValueRef si_nir_load_sampler_desc(struct ac_shader_abi *abi, unsigned descriptor_set, unsigned base_index, unsigned constant_index, LLVMValueRef dynamic_index, enum ac_descriptor_type desc_type, bool image, bool write, bool bindless) { struct si_shader_context *ctx = si_shader_context_from_abi(abi); LLVMBuilderRef builder = ctx->ac.builder; unsigned const_index = base_index + constant_index; assert(!descriptor_set); assert(desc_type <= AC_DESC_BUFFER); if (bindless) { LLVMValueRef list = ac_get_arg(&ctx->ac, ctx->bindless_samplers_and_images); /* dynamic_index is the bindless handle */ if (image) { /* Bindless image descriptors use 16-dword slots. */ dynamic_index = LLVMBuildMul(ctx->ac.builder, dynamic_index, LLVMConstInt(ctx->ac.i64, 2, 0), ""); /* FMASK is right after the image. */ if (desc_type == AC_DESC_FMASK) { dynamic_index = LLVMBuildAdd(ctx->ac.builder, dynamic_index, ctx->ac.i32_1, ""); } return si_load_image_desc(ctx, list, dynamic_index, desc_type, write, true); } /* Since bindless handle arithmetic can contain an unsigned integer * wraparound and si_load_sampler_desc assumes there isn't any, * use GEP without "inbounds" (inside ac_build_pointer_add) * to prevent incorrect code generation and hangs. */ dynamic_index = LLVMBuildMul(ctx->ac.builder, dynamic_index, LLVMConstInt(ctx->ac.i64, 2, 0), ""); list = ac_build_pointer_add(&ctx->ac, list, dynamic_index); return si_load_sampler_desc(ctx, list, ctx->ac.i32_0, desc_type); } unsigned num_slots = image ? ctx->num_images : ctx->num_samplers; assert(const_index < num_slots || dynamic_index); LLVMValueRef list = ac_get_arg(&ctx->ac, ctx->samplers_and_images); LLVMValueRef index = LLVMConstInt(ctx->ac.i32, const_index, false); if (dynamic_index) { index = LLVMBuildAdd(builder, index, dynamic_index, ""); /* From the GL_ARB_shader_image_load_store extension spec: * * If a shader performs an image load, store, or atomic * operation using an image variable declared as an array, * and if the index used to select an individual element is * negative or greater than or equal to the size of the * array, the results of the operation are undefined but may * not lead to termination. */ index = si_llvm_bound_index(ctx, index, num_slots); } if (image) { /* FMASKs are separate from images. */ if (desc_type == AC_DESC_FMASK) { index = LLVMBuildAdd(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i32, SI_NUM_IMAGES, 0), ""); } index = LLVMBuildSub(ctx->ac.builder, LLVMConstInt(ctx->ac.i32, SI_NUM_IMAGE_SLOTS - 1, 0), index, ""); return si_load_image_desc(ctx, list, index, desc_type, write, false); } index = LLVMBuildAdd(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i32, SI_NUM_IMAGE_SLOTS / 2, 0), ""); return si_load_sampler_desc(ctx, list, index, desc_type); } void si_llvm_init_resource_callbacks(struct si_shader_context *ctx) { ctx->abi.load_ubo = load_ubo; ctx->abi.load_ssbo = load_ssbo; ctx->abi.load_sampler_desc = si_nir_load_sampler_desc; }