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/*
* 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 v3d_opt_small_immediates.c
*
* Turns references to small constant uniform values into small immediates
* fields.
*/
#include "v3d_compiler.h"
static bool debug;
bool
vir_opt_small_immediates(struct v3d_compile *c)
{
bool progress = false;
vir_for_each_inst_inorder(inst, c) {
if (inst->qpu.type != V3D_QPU_INSTR_TYPE_ALU)
continue;
/* 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 < vir_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 < vir_get_nsrc(inst); i++) {
if (inst->src[i].file != QFILE_TEMP)
continue;
/* See if it's a uniform load. */
struct qinst *src_def = c->defs[inst->src[i].index];
if (!src_def || !src_def->qpu.sig.ldunif)
continue;
int uniform = src_def->uniform;
if (c->uniform_contents[uniform] != QUNIFORM_CONSTANT)
continue;
/* Check if the uniform is suitable as a small
* immediate.
*/
uint32_t imm = c->uniform_data[uniform];
uint32_t packed;
if (!v3d_qpu_small_imm_pack(c->devinfo, imm, &packed))
continue;
/* Check that we don't have any other signals already
* that would be incompatible with small_imm.
*/
struct v3d_qpu_sig new_sig = inst->qpu.sig;
uint32_t sig_packed;
new_sig.small_imm = true;
if (!v3d_qpu_sig_pack(c->devinfo, &new_sig, &sig_packed))
continue;
if (debug) {
fprintf(stderr, "opt_small_immediate() from: ");
vir_dump_inst(c, inst);
fprintf(stderr, "\n");
}
inst->qpu.sig.small_imm = true;
inst->qpu.raddr_b = packed;
inst->src[i].file = QFILE_SMALL_IMM;
inst->src[i].index = imm;
if (debug) {
fprintf(stderr, "to: ");
vir_dump_inst(c, inst);
fprintf(stderr, "\n");
}
progress = true;
break;
}
}
return progress;
}
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