From 4ba9be2882d9f1567809edb0a31fcdf11320d41f Mon Sep 17 00:00:00 2001 From: marha Date: Mon, 20 Apr 2015 21:25:25 +0200 Subject: randrproto xkeyboard-config fontconfig libX11 libXdmcp libXmu pixman xkbcomp xserver mesa git update 20 Apr 2015 xserver commit b1029716e41e252f149b82124a149da180607c96 xkeyboard-config commit 7d00bcc2d9c3944bbdfcbe472ee3299729dc7687 libX11 commit 748d47e69f5c12d8557d56a8a8ec166588da7b93 libXdmcp commit b10f382e3aa2e86cd5a2bc27d6758da55f0ab1f6 xkbcomp commit 1ae525b3d236b59e6437b2b5433d460e18370973 pixman commit 58e21d3e45c5227c2ca9ac00cf044f22a7975180 randrproto commit 98da0d6e48b7d124d6788ea568e9f9e3dc204322 libXmu commit 4459e6940fe3fdf26a8d5d4c71989498bc400a62 fontconfig commit 07be485a0a84995ce69bf60e3b1bb22cb35f6b0e mesa commit c1485f4b7d044724b3dbc1011f3c3a8a53132010 --- mesalib/src/glsl/nir/nir_opt_peephole_ffma.c | 261 +++++++++++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 mesalib/src/glsl/nir/nir_opt_peephole_ffma.c (limited to 'mesalib/src/glsl/nir/nir_opt_peephole_ffma.c') diff --git a/mesalib/src/glsl/nir/nir_opt_peephole_ffma.c b/mesalib/src/glsl/nir/nir_opt_peephole_ffma.c new file mode 100644 index 000000000..9d5646fe6 --- /dev/null +++ b/mesalib/src/glsl/nir/nir_opt_peephole_ffma.c @@ -0,0 +1,261 @@ +/* + * Copyright © 2014 Intel Corporation + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + * + * Authors: + * Jason Ekstrand (jason@jlekstrand.net) + * + */ + +#include "nir.h" + +/* + * Implements a small peephole optimization that looks for a multiply that + * is only ever used in an add and replaces both with an fma. + */ + +struct peephole_ffma_state { + void *mem_ctx; + nir_function_impl *impl; + bool progress; +}; + +static inline bool +are_all_uses_fadd(nir_ssa_def *def) +{ + if (def->if_uses->entries > 0) + return false; + + struct set_entry *use_iter; + set_foreach(def->uses, use_iter) { + nir_instr *use_instr = (nir_instr *)use_iter->key; + + if (use_instr->type != nir_instr_type_alu) + return false; + + nir_alu_instr *use_alu = nir_instr_as_alu(use_instr); + switch (use_alu->op) { + case nir_op_fadd: + break; /* This one's ok */ + + case nir_op_imov: + case nir_op_fmov: + case nir_op_fneg: + case nir_op_fabs: + assert(use_alu->dest.dest.is_ssa); + if (!are_all_uses_fadd(&use_alu->dest.dest.ssa)) + return false; + break; + + default: + return false; + } + } + + return true; +} + +static nir_alu_instr * +get_mul_for_src(nir_alu_src *src, uint8_t swizzle[4], bool *negate, bool *abs) +{ + assert(src->src.is_ssa && !src->abs && !src->negate); + + nir_instr *instr = src->src.ssa->parent_instr; + if (instr->type != nir_instr_type_alu) + return NULL; + + nir_alu_instr *alu = nir_instr_as_alu(instr); + switch (alu->op) { + case nir_op_imov: + case nir_op_fmov: + alu = get_mul_for_src(&alu->src[0], swizzle, negate, abs); + break; + + case nir_op_fneg: + alu = get_mul_for_src(&alu->src[0], swizzle, negate, abs); + *negate = !*negate; + break; + + case nir_op_fabs: + alu = get_mul_for_src(&alu->src[0], swizzle, negate, abs); + *negate = false; + *abs = true; + break; + + case nir_op_fmul: + /* Only absorb a fmul into a ffma if the fmul is is only used in fadd + * operations. This prevents us from being too aggressive with our + * fusing which can actually lead to more instructions. + */ + if (!are_all_uses_fadd(&alu->dest.dest.ssa)) + return NULL; + break; + + default: + return NULL; + } + + if (!alu) + return NULL; + + for (unsigned i = 0; i < 4; i++) { + if (!(alu->dest.write_mask & (1 << i))) + break; + + swizzle[i] = swizzle[src->swizzle[i]]; + } + + return alu; +} + +static bool +nir_opt_peephole_ffma_block(nir_block *block, void *void_state) +{ + struct peephole_ffma_state *state = void_state; + + nir_foreach_instr_safe(block, instr) { + if (instr->type != nir_instr_type_alu) + continue; + + nir_alu_instr *add = nir_instr_as_alu(instr); + if (add->op != nir_op_fadd) + continue; + + /* TODO: Maybe bail if this expression is considered "precise"? */ + + assert(add->src[0].src.is_ssa && add->src[1].src.is_ssa); + + /* This, is the case a + a. We would rather handle this with an + * algebraic reduction than fuse it. Also, we want to only fuse + * things where the multiply is used only once and, in this case, + * it would be used twice by the same instruction. + */ + if (add->src[0].src.ssa == add->src[1].src.ssa) + continue; + + nir_alu_instr *mul; + uint8_t add_mul_src, swizzle[4]; + bool negate, abs; + for (add_mul_src = 0; add_mul_src < 2; add_mul_src++) { + for (unsigned i = 0; i < 4; i++) + swizzle[i] = i; + + negate = false; + abs = false; + + mul = get_mul_for_src(&add->src[add_mul_src], swizzle, &negate, &abs); + + if (mul != NULL) + break; + } + + if (mul == NULL) + continue; + + nir_ssa_def *mul_src[2]; + mul_src[0] = mul->src[0].src.ssa; + mul_src[1] = mul->src[1].src.ssa; + + if (abs) { + for (unsigned i = 0; i < 2; i++) { + nir_alu_instr *abs = nir_alu_instr_create(state->mem_ctx, + nir_op_fabs); + abs->src[0].src = nir_src_for_ssa(mul_src[i]); + nir_ssa_dest_init(&abs->instr, &abs->dest.dest, + mul_src[i]->num_components, NULL); + abs->dest.write_mask = (1 << mul_src[i]->num_components) - 1; + nir_instr_insert_before(&add->instr, &abs->instr); + mul_src[i] = &abs->dest.dest.ssa; + } + } + + if (negate) { + nir_alu_instr *neg = nir_alu_instr_create(state->mem_ctx, + nir_op_fneg); + neg->src[0].src = nir_src_for_ssa(mul_src[0]); + nir_ssa_dest_init(&neg->instr, &neg->dest.dest, + mul_src[0]->num_components, NULL); + neg->dest.write_mask = (1 << mul_src[0]->num_components) - 1; + nir_instr_insert_before(&add->instr, &neg->instr); + mul_src[0] = &neg->dest.dest.ssa; + } + + nir_alu_instr *ffma = nir_alu_instr_create(state->mem_ctx, nir_op_ffma); + ffma->dest.saturate = add->dest.saturate; + ffma->dest.write_mask = add->dest.write_mask; + + for (unsigned i = 0; i < 2; i++) { + ffma->src[i].src = nir_src_for_ssa(mul_src[i]); + for (unsigned j = 0; j < add->dest.dest.ssa.num_components; j++) + ffma->src[i].swizzle[j] = mul->src[i].swizzle[swizzle[j]]; + } + nir_alu_src_copy(&ffma->src[2], &add->src[1 - add_mul_src], + state->mem_ctx); + + assert(add->dest.dest.is_ssa); + + nir_ssa_dest_init(&ffma->instr, &ffma->dest.dest, + add->dest.dest.ssa.num_components, + add->dest.dest.ssa.name); + nir_ssa_def_rewrite_uses(&add->dest.dest.ssa, + nir_src_for_ssa(&ffma->dest.dest.ssa), + state->mem_ctx); + + nir_instr_insert_before(&add->instr, &ffma->instr); + assert(add->dest.dest.ssa.uses->entries == 0); + nir_instr_remove(&add->instr); + + state->progress = true; + } + + return true; +} + +static bool +nir_opt_peephole_ffma_impl(nir_function_impl *impl) +{ + struct peephole_ffma_state state; + + state.mem_ctx = ralloc_parent(impl); + state.impl = impl; + state.progress = false; + + nir_foreach_block(impl, nir_opt_peephole_ffma_block, &state); + + if (state.progress) + nir_metadata_preserve(impl, nir_metadata_block_index | + nir_metadata_dominance); + + return state.progress; +} + +bool +nir_opt_peephole_ffma(nir_shader *shader) +{ + bool progress = false; + + nir_foreach_overload(shader, overload) { + if (overload->impl) + progress |= nir_opt_peephole_ffma_impl(overload->impl); + } + + return progress; +} -- cgit v1.2.3