diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_swizzle.c')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_swizzle.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c b/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c new file mode 100644 index 00000000000..ac7eed9379a --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c @@ -0,0 +1,238 @@ +/************************************************************************** + * + * Copyright 2009 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. + * + **************************************************************************/ + +/** + * @file + * Helper functions for swizzling/shuffling. + * + * @author Jose Fonseca <jfonseca@vmware.com> + */ + + +#include "util/u_debug.h" + +#include "lp_bld_type.h" +#include "lp_bld_const.h" +#include "lp_bld_logic.h" +#include "lp_bld_swizzle.h" + + +LLVMValueRef +lp_build_broadcast(LLVMBuilderRef builder, + LLVMTypeRef vec_type, + LLVMValueRef scalar) +{ + const unsigned n = LLVMGetVectorSize(vec_type); + LLVMValueRef res; + unsigned i; + + res = LLVMGetUndef(vec_type); + for(i = 0; i < n; ++i) { + LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0); + res = LLVMBuildInsertElement(builder, res, scalar, index, ""); + } + + return res; +} + + +LLVMValueRef +lp_build_broadcast_scalar(struct lp_build_context *bld, + LLVMValueRef scalar) +{ + const union lp_type type = bld->type; + LLVMValueRef res; + unsigned i; + + res = bld->undef; + for(i = 0; i < type.length; ++i) { + LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0); + res = LLVMBuildInsertElement(bld->builder, res, scalar, index, ""); + } + + return res; +} + + +LLVMValueRef +lp_build_broadcast_aos(struct lp_build_context *bld, + LLVMValueRef a, + unsigned channel) +{ + const union lp_type type = bld->type; + const unsigned n = type.length; + unsigned i, j; + + if(a == bld->undef || a == bld->zero || a == bld->one) + return a; + + /* XXX: SSE3 has PSHUFB which should be better than bitmasks, but forcing + * using shuffles here actually causes worst results. More investigation is + * needed. */ + if (n <= 4) { + /* + * Shuffle. + */ + LLVMTypeRef elem_type = LLVMInt32Type(); + LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH]; + + for(j = 0; j < n; j += 4) + for(i = 0; i < 4; ++i) + shuffles[j + i] = LLVMConstInt(elem_type, j + channel, 0); + + return LLVMBuildShuffleVector(bld->builder, a, bld->undef, LLVMConstVector(shuffles, n), ""); + } + else { + /* + * Bit mask and recursive shifts + * + * XYZW XYZW .... XYZW <= input + * 0Y00 0Y00 .... 0Y00 + * YY00 YY00 .... YY00 + * YYYY YYYY .... YYYY <= output + */ + union lp_type type4 = type; + const char shifts[4][2] = { + { 1, 2}, + {-1, 2}, + { 1, -2}, + {-1, -2} + }; + boolean cond[4]; + unsigned i; + + memset(cond, 0, sizeof cond); + cond[channel] = 1; + + a = LLVMBuildAnd(bld->builder, a, lp_build_const_mask_aos(type, cond), ""); + + type4.width *= 4; + type4.length /= 4; + + a = LLVMBuildBitCast(bld->builder, a, lp_build_vec_type(type4), ""); + + for(i = 0; i < 2; ++i) { + LLVMValueRef tmp = NULL; + int shift = shifts[channel][i]; + +#ifdef PIPE_ARCH_LITTLE_ENDIAN + shift = -shift; +#endif + + if(shift > 0) + tmp = LLVMBuildLShr(bld->builder, a, lp_build_int_const_scalar(type4, shift*type.width), ""); + if(shift < 0) + tmp = LLVMBuildShl(bld->builder, a, lp_build_int_const_scalar(type4, -shift*type.width), ""); + + assert(tmp); + if(tmp) + a = LLVMBuildOr(bld->builder, a, tmp, ""); + } + + return LLVMBuildBitCast(bld->builder, a, lp_build_vec_type(type), ""); + } +} + + +LLVMValueRef +lp_build_swizzle1_aos(struct lp_build_context *bld, + LLVMValueRef a, + unsigned char swizzle[4]) +{ + const unsigned n = bld->type.length; + unsigned i, j; + + if(a == bld->undef || a == bld->zero || a == bld->one) + return a; + + if(swizzle[0] == swizzle[1] && swizzle[1] == swizzle[2] && swizzle[2] == swizzle[3]) + return lp_build_broadcast_aos(bld, a, swizzle[0]); + + { + /* + * Shuffle. + */ + LLVMTypeRef elem_type = LLVMInt32Type(); + LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH]; + + for(j = 0; j < n; j += 4) + for(i = 0; i < 4; ++i) + shuffles[j + i] = LLVMConstInt(elem_type, j + swizzle[i], 0); + + return LLVMBuildShuffleVector(bld->builder, a, bld->undef, LLVMConstVector(shuffles, n), ""); + } +} + + +LLVMValueRef +lp_build_swizzle2_aos(struct lp_build_context *bld, + LLVMValueRef a, + LLVMValueRef b, + unsigned char swizzle[4]) +{ + const unsigned n = bld->type.length; + unsigned i, j; + + if(swizzle[0] < 4 && swizzle[1] < 4 && swizzle[2] < 4 && swizzle[3] < 4) + return lp_build_swizzle1_aos(bld, a, swizzle); + + if(a == b) { + swizzle[0] %= 4; + swizzle[1] %= 4; + swizzle[2] %= 4; + swizzle[3] %= 4; + return lp_build_swizzle1_aos(bld, a, swizzle); + } + + if(swizzle[0] % 4 == 0 && + swizzle[1] % 4 == 1 && + swizzle[2] % 4 == 2 && + swizzle[3] % 4 == 3) { + boolean cond[4]; + cond[0] = swizzle[0] / 4; + cond[1] = swizzle[1] / 4; + cond[2] = swizzle[2] / 4; + cond[3] = swizzle[3] / 4; + return lp_build_select_aos(bld, a, b, cond); + } + + { + /* + * Shuffle. + */ + LLVMTypeRef elem_type = LLVMInt32Type(); + LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH]; + + for(j = 0; j < n; j += 4) + for(i = 0; i < 4; ++i) + shuffles[j + i] = LLVMConstInt(elem_type, j + (swizzle[i] % 4) + (swizzle[i] / 4 * n), 0); + + return LLVMBuildShuffleVector(bld->builder, a, b, LLVMConstVector(shuffles, n), ""); + } +} + + |