/*
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* Copyright © 2014 Broadcom
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/**
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* @file vc4_opt_small_immediates.c
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*
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* Turns references to small constant uniform values into small immediates
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* fields.
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*/
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#include "vc4_qir.h"
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#include "vc4_qpu.h"
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static bool debug;
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bool
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qir_opt_small_immediates(struct vc4_compile *c)
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{
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bool progress = false;
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qir_for_each_inst_inorder(inst, c) {
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/* The small immediate value sits in the raddr B field, so we
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* can't have 2 small immediates in one instruction (unless
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* they're the same value, but that should be optimized away
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* elsewhere).
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*/
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bool uses_small_imm = false;
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for (int i = 0; i < qir_get_nsrc(inst); i++) {
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if (inst->src[i].file == QFILE_SMALL_IMM)
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uses_small_imm = true;
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}
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if (uses_small_imm)
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continue;
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/* Don't propagate small immediates into the top-end bounds
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* checking for indirect UBO loads. The kernel doesn't parse
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* small immediates and rejects the shader in this case. UBO
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* loads are much more expensive than the uniform load, and
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* indirect UBO regions are usually much larger than a small
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* immediate, so it's not worth updating the kernel to allow
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* optimizing it.
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*/
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if (inst->op == QOP_MIN_NOIMM)
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continue;
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for (int i = 0; i < qir_get_nsrc(inst); i++) {
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struct qreg src = qir_follow_movs(c, inst->src[i]);
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if (src.file != QFILE_UNIF ||
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src.pack ||
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c->uniform_contents[src.index] !=
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QUNIFORM_CONSTANT) {
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continue;
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}
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if (qir_is_tex(inst) &&
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i == qir_get_tex_uniform_src(inst)) {
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/* No turning the implicit uniform read into
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* an immediate.
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*/
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continue;
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}
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uint32_t imm = c->uniform_data[src.index];
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uint32_t small_imm = qpu_encode_small_immediate(imm);
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if (small_imm == ~0)
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continue;
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if (debug) {
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fprintf(stderr, "opt_small_immediate() from: ");
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qir_dump_inst(c, inst);
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fprintf(stderr, "\n");
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}
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inst->src[i].file = QFILE_SMALL_IMM;
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inst->src[i].index = imm;
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if (debug) {
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fprintf(stderr, "to: ");
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qir_dump_inst(c, inst);
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fprintf(stderr, "\n");
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}
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progress = true;
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break;
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}
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}
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return progress;
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}
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