/* * Copyright © 2014 Broadcom * * 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. */ /** * @file vc4_opt_small_immediates.c * * Turns references to small constant uniform values into small immediates * fields. */ #include "vc4_qir.h" #include "vc4_qpu.h" static bool debug; bool qir_opt_small_immediates(struct vc4_compile *c) { bool progress = false; qir_for_each_inst_inorder(inst, c) { /* The small immediate value sits in the raddr B field, so we * can't have 2 small immediates in one instruction (unless * they're the same value, but that should be optimized away * elsewhere). */ bool uses_small_imm = false; for (int i = 0; i < qir_get_nsrc(inst); i++) { if (inst->src[i].file == QFILE_SMALL_IMM) uses_small_imm = true; } if (uses_small_imm) continue; for (int i = 0; i < qir_get_nsrc(inst); i++) { struct qreg src = qir_follow_movs(c, inst->src[i]); if (src.file != QFILE_UNIF || src.pack || c->uniform_contents[src.index] != QUNIFORM_CONSTANT) { continue; } if (qir_is_tex(inst) && i == qir_get_tex_uniform_src(inst)) { /* No turning the implicit uniform read into * an immediate. */ continue; } uint32_t imm = c->uniform_data[src.index]; uint32_t small_imm = qpu_encode_small_immediate(imm); if (small_imm == ~0) continue; if (debug) { fprintf(stderr, "opt_small_immediate() from: "); qir_dump_inst(c, inst); fprintf(stderr, "\n"); } inst->src[i].file = QFILE_SMALL_IMM; inst->src[i].index = imm; if (debug) { fprintf(stderr, "to: "); qir_dump_inst(c, inst); fprintf(stderr, "\n"); } progress = true; break; } } return progress; }