diff options
Diffstat (limited to 'src/gallium/auxiliary/gallivm/lp_bld_format_cached.c')
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_format_cached.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_format_cached.c b/src/gallium/auxiliary/gallivm/lp_bld_format_cached.c new file mode 100644 index 0000000..b683e7f --- /dev/null +++ b/src/gallium/auxiliary/gallivm/lp_bld_format_cached.c @@ -0,0 +1,374 @@ +/************************************************************************** + * + * Copyright 2015 VMware, 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 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 VMWARE AND/OR ITS 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 "lp_bld_format.h" +#include "lp_bld_type.h" +#include "lp_bld_struct.h" +#include "lp_bld_const.h" +#include "lp_bld_flow.h" +#include "lp_bld_swizzle.h" + +#include "util/u_math.h" + + +/** + * @file + * Complex block-compression based formats are handled here by using a cache, + * so re-decoding of every pixel is not required. + * Especially for bilinear filtering, texel reuse is very high hence even + * a small cache helps. + * The elements in the cache are the decoded blocks - currently things + * are restricted to formats which are 4x4 block based, and the decoded + * texels must fit into 4x8 bits. + * The cache is direct mapped so hitrates aren't all that great and cache + * thrashing could happen. + * + * @author Roland Scheidegger <sroland@vmware.com> + */ + + +#if LP_BUILD_FORMAT_CACHE_DEBUG +static void +update_cache_access(struct gallivm_state *gallivm, + LLVMValueRef ptr, + unsigned count, + unsigned index) +{ + LLVMBuilderRef builder = gallivm->builder; + LLVMValueRef member_ptr, cache_access; + + assert(index == LP_BUILD_FORMAT_CACHE_MEMBER_ACCESS_TOTAL || + index == LP_BUILD_FORMAT_CACHE_MEMBER_ACCESS_MISS); + + member_ptr = lp_build_struct_get_ptr(gallivm, ptr, index, ""); + cache_access = LLVMBuildLoad(builder, member_ptr, "cache_access"); + cache_access = LLVMBuildAdd(builder, cache_access, + LLVMConstInt(LLVMInt64TypeInContext(gallivm->context), + count, 0), ""); + LLVMBuildStore(builder, cache_access, member_ptr); +} +#endif + + +static void +store_cached_block(struct gallivm_state *gallivm, + LLVMValueRef *col, + LLVMValueRef tag_value, + LLVMValueRef hash_index, + LLVMValueRef cache) +{ + LLVMBuilderRef builder = gallivm->builder; + LLVMValueRef ptr, indices[3]; + LLVMTypeRef type_ptr4x32; + unsigned count; + + type_ptr4x32 = LLVMPointerType(LLVMVectorType(LLVMInt32TypeInContext(gallivm->context), 4), 0); + indices[0] = lp_build_const_int32(gallivm, 0); + indices[1] = lp_build_const_int32(gallivm, LP_BUILD_FORMAT_CACHE_MEMBER_TAGS); + indices[2] = hash_index; + ptr = LLVMBuildGEP(builder, cache, indices, Elements(indices), ""); + LLVMBuildStore(builder, tag_value, ptr); + + indices[1] = lp_build_const_int32(gallivm, LP_BUILD_FORMAT_CACHE_MEMBER_DATA); + hash_index = LLVMBuildMul(builder, hash_index, + lp_build_const_int32(gallivm, 16), ""); + for (count = 0; count < 4; count++) { + indices[2] = hash_index; + ptr = LLVMBuildGEP(builder, cache, indices, Elements(indices), ""); + ptr = LLVMBuildBitCast(builder, ptr, type_ptr4x32, ""); + LLVMBuildStore(builder, col[count], ptr); + hash_index = LLVMBuildAdd(builder, hash_index, + lp_build_const_int32(gallivm, 4), ""); + } +} + + +static LLVMValueRef +lookup_cached_pixel(struct gallivm_state *gallivm, + LLVMValueRef ptr, + LLVMValueRef index) +{ + LLVMBuilderRef builder = gallivm->builder; + LLVMValueRef member_ptr, indices[3]; + + indices[0] = lp_build_const_int32(gallivm, 0); + indices[1] = lp_build_const_int32(gallivm, LP_BUILD_FORMAT_CACHE_MEMBER_DATA); + indices[2] = index; + member_ptr = LLVMBuildGEP(builder, ptr, indices, Elements(indices), ""); + return LLVMBuildLoad(builder, member_ptr, "cache_data"); +} + + +static LLVMValueRef +lookup_tag_data(struct gallivm_state *gallivm, + LLVMValueRef ptr, + LLVMValueRef index) +{ + LLVMBuilderRef builder = gallivm->builder; + LLVMValueRef member_ptr, indices[3]; + + indices[0] = lp_build_const_int32(gallivm, 0); + indices[1] = lp_build_const_int32(gallivm, LP_BUILD_FORMAT_CACHE_MEMBER_TAGS); + indices[2] = index; + member_ptr = LLVMBuildGEP(builder, ptr, indices, Elements(indices), ""); + return LLVMBuildLoad(builder, member_ptr, "tag_data"); +} + + +static void +update_cached_block(struct gallivm_state *gallivm, + const struct util_format_description *format_desc, + LLVMValueRef ptr_addr, + LLVMValueRef hash_index, + LLVMValueRef cache) + +{ + LLVMBuilderRef builder = gallivm->builder; + LLVMTypeRef i8t = LLVMInt8TypeInContext(gallivm->context); + LLVMTypeRef pi8t = LLVMPointerType(i8t, 0); + LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context); + LLVMTypeRef i32x4 = LLVMVectorType(LLVMInt32TypeInContext(gallivm->context), 4); + LLVMValueRef function; + LLVMValueRef tag_value, tmp_ptr; + LLVMValueRef col[4]; + unsigned i, j; + + /* + * Use format_desc->fetch_rgba_8unorm() for each pixel in the block. + * This doesn't actually make any sense whatsoever, someone would need + * to write a function doing this for all pixels in a block (either as + * an external c function or with generated code). Don't ask. + */ + + { + /* + * Function to call looks like: + * fetch(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j) + */ + LLVMTypeRef ret_type; + LLVMTypeRef arg_types[4]; + LLVMTypeRef function_type; + + assert(format_desc->fetch_rgba_8unorm); + + ret_type = LLVMVoidTypeInContext(gallivm->context); + arg_types[0] = pi8t; + arg_types[1] = pi8t; + arg_types[2] = i32t; + arg_types[3] = i32t; + function_type = LLVMFunctionType(ret_type, arg_types, + Elements(arg_types), 0); + + /* make const pointer for the C fetch_rgba_8unorm function */ + function = lp_build_const_int_pointer(gallivm, + func_to_pointer((func_pointer) format_desc->fetch_rgba_8unorm)); + + /* cast the callee pointer to the function's type */ + function = LLVMBuildBitCast(builder, function, + LLVMPointerType(function_type, 0), + "cast callee"); + } + + tmp_ptr = lp_build_array_alloca(gallivm, i32x4, + lp_build_const_int32(gallivm, 16), + "tmp_decode_store"); + tmp_ptr = LLVMBuildBitCast(builder, tmp_ptr, pi8t, ""); + + /* + * Invoke format_desc->fetch_rgba_8unorm() for each pixel. + * This is going to be really really slow. + * Note: the block store format is actually + * x0y0x0y1x0y2x0y3 x1y0x1y1x1y2x1y3 ... + */ + for (i = 0; i < 4; ++i) { + for (j = 0; j < 4; ++j) { + LLVMValueRef args[4]; + LLVMValueRef dst_offset = lp_build_const_int32(gallivm, (i * 4 + j) * 4); + + /* + * Note we actually supply a pointer to the start of the block, + * not the start of the texture. + */ + args[0] = LLVMBuildGEP(gallivm->builder, tmp_ptr, &dst_offset, 1, ""); + args[1] = ptr_addr; + args[2] = LLVMConstInt(i32t, i, 0); + args[3] = LLVMConstInt(i32t, j, 0); + LLVMBuildCall(builder, function, args, Elements(args), ""); + } + } + + /* Finally store the block - pointless mem copy + update tag. */ + tmp_ptr = LLVMBuildBitCast(builder, tmp_ptr, LLVMPointerType(i32x4, 0), ""); + for (i = 0; i < 4; ++i) { + LLVMValueRef tmp_offset = lp_build_const_int32(gallivm, i); + LLVMValueRef ptr = LLVMBuildGEP(gallivm->builder, tmp_ptr, &tmp_offset, 1, ""); + col[i] = LLVMBuildLoad(builder, ptr, ""); + } + + tag_value = LLVMBuildPtrToInt(gallivm->builder, ptr_addr, + LLVMInt64TypeInContext(gallivm->context), ""); + store_cached_block(gallivm, col, tag_value, hash_index, cache); +} + + +/* + * Do a cached lookup. + * + * Returns (vectors of) 4x8 rgba aos value + */ +LLVMValueRef +lp_build_fetch_cached_texels(struct gallivm_state *gallivm, + const struct util_format_description *format_desc, + unsigned n, + LLVMValueRef base_ptr, + LLVMValueRef offset, + LLVMValueRef i, + LLVMValueRef j, + LLVMValueRef cache) + +{ + LLVMBuilderRef builder = gallivm->builder; + unsigned count, low_bit, log2size; + LLVMValueRef color, offset_stored, addr, ptr_addrtrunc, tmp; + LLVMValueRef ij_index, hash_index, hash_mask, block_index; + LLVMTypeRef i8t = LLVMInt8TypeInContext(gallivm->context); + LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context); + LLVMTypeRef i64t = LLVMInt64TypeInContext(gallivm->context); + struct lp_type type; + struct lp_build_context bld32; + memset(&type, 0, sizeof type); + type.width = 32; + type.length = n; + + assert(format_desc->block.width == 4); + assert(format_desc->block.height == 4); + + lp_build_context_init(&bld32, gallivm, type); + + /* + * compute hash - we use direct mapped cache, the hash function could + * be better but it needs to be simple + * per-element: + * compare offset with offset stored at tag (hash) + * if not equal decode/store block, update tag + * extract color from cache + * assemble result vector + */ + + /* TODO: not ideal with 32bit pointers... */ + + low_bit = util_logbase2(format_desc->block.bits / 8); + log2size = util_logbase2(LP_BUILD_FORMAT_CACHE_SIZE); + addr = LLVMBuildPtrToInt(builder, base_ptr, i64t, ""); + ptr_addrtrunc = LLVMBuildPtrToInt(builder, base_ptr, i32t, ""); + ptr_addrtrunc = lp_build_broadcast_scalar(&bld32, ptr_addrtrunc); + /* For the hash function, first mask off the unused lowest bits. Then just + do some xor with address bits - only use lower 32bits */ + ptr_addrtrunc = LLVMBuildAdd(builder, offset, ptr_addrtrunc, ""); + ptr_addrtrunc = LLVMBuildLShr(builder, ptr_addrtrunc, + lp_build_const_int_vec(gallivm, type, low_bit), ""); + /* This only really makes sense for size 64,128,256 */ + hash_index = ptr_addrtrunc; + ptr_addrtrunc = LLVMBuildLShr(builder, ptr_addrtrunc, + lp_build_const_int_vec(gallivm, type, 2*log2size), ""); + hash_index = LLVMBuildXor(builder, ptr_addrtrunc, hash_index, ""); + tmp = LLVMBuildLShr(builder, hash_index, + lp_build_const_int_vec(gallivm, type, log2size), ""); + hash_index = LLVMBuildXor(builder, hash_index, tmp, ""); + + hash_mask = lp_build_const_int_vec(gallivm, type, LP_BUILD_FORMAT_CACHE_SIZE - 1); + hash_index = LLVMBuildAnd(builder, hash_index, hash_mask, ""); + ij_index = LLVMBuildShl(builder, i, lp_build_const_int_vec(gallivm, type, 2), ""); + ij_index = LLVMBuildAdd(builder, ij_index, j, ""); + block_index = LLVMBuildShl(builder, hash_index, + lp_build_const_int_vec(gallivm, type, 4), ""); + block_index = LLVMBuildAdd(builder, ij_index, block_index, ""); + + if (n > 1) { + color = LLVMGetUndef(LLVMVectorType(i32t, n)); + for (count = 0; count < n; count++) { + LLVMValueRef index, cond, colorx; + LLVMValueRef block_indexx, hash_indexx, addrx, offsetx, ptr_addrx; + struct lp_build_if_state if_ctx; + + index = lp_build_const_int32(gallivm, count); + offsetx = LLVMBuildExtractElement(builder, offset, index, ""); + addrx = LLVMBuildZExt(builder, offsetx, i64t, ""); + addrx = LLVMBuildAdd(builder, addrx, addr, ""); + block_indexx = LLVMBuildExtractElement(builder, block_index, index, ""); + hash_indexx = LLVMBuildLShr(builder, block_indexx, + lp_build_const_int32(gallivm, 4), ""); + offset_stored = lookup_tag_data(gallivm, cache, hash_indexx); + cond = LLVMBuildICmp(builder, LLVMIntNE, offset_stored, addrx, ""); + + lp_build_if(&if_ctx, gallivm, cond); + { + ptr_addrx = LLVMBuildIntToPtr(builder, addrx, + LLVMPointerType(i8t, 0), ""); + update_cached_block(gallivm, format_desc, ptr_addrx, hash_indexx, cache); +#if LP_BUILD_FORMAT_CACHE_DEBUG + update_cache_access(gallivm, cache, 1, + LP_BUILD_FORMAT_CACHE_MEMBER_ACCESS_MISS); +#endif + } + lp_build_endif(&if_ctx); + + colorx = lookup_cached_pixel(gallivm, cache, block_indexx); + + color = LLVMBuildInsertElement(builder, color, colorx, + lp_build_const_int32(gallivm, count), ""); + } + } + else { + LLVMValueRef cond; + struct lp_build_if_state if_ctx; + + tmp = LLVMBuildZExt(builder, offset, i64t, ""); + addr = LLVMBuildAdd(builder, tmp, addr, ""); + offset_stored = lookup_tag_data(gallivm, cache, hash_index); + cond = LLVMBuildICmp(builder, LLVMIntNE, offset_stored, addr, ""); + + lp_build_if(&if_ctx, gallivm, cond); + { + tmp = LLVMBuildIntToPtr(builder, addr, LLVMPointerType(i8t, 0), ""); + update_cached_block(gallivm, format_desc, tmp, hash_index, cache); +#if LP_BUILD_FORMAT_CACHE_DEBUG + update_cache_access(gallivm, cache, 1, + LP_BUILD_FORMAT_CACHE_MEMBER_ACCESS_MISS); +#endif + } + lp_build_endif(&if_ctx); + + color = lookup_cached_pixel(gallivm, cache, block_index); + } +#if LP_BUILD_FORMAT_CACHE_DEBUG + update_cache_access(gallivm, cache, n, + LP_BUILD_FORMAT_CACHE_MEMBER_ACCESS_TOTAL); +#endif + return LLVMBuildBitCast(builder, color, LLVMVectorType(i8t, n * 4), ""); +} + |