diff options
Diffstat (limited to 'src/broadcom/compiler/vir_opt_small_immediates.c')
| -rw-r--r-- | src/broadcom/compiler/vir_opt_small_immediates.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/broadcom/compiler/vir_opt_small_immediates.c b/src/broadcom/compiler/vir_opt_small_immediates.c new file mode 100644 index 00000000000..5491f9c24c8 --- /dev/null +++ b/src/broadcom/compiler/vir_opt_small_immediates.c @@ -0,0 +1,112 @@ +/* + * 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++) { + struct qreg src = vir_follow_movs(c, inst->src[i]); + + if (src.file != QFILE_UNIF || + c->uniform_contents[src.index] != + QUNIFORM_CONSTANT) { + continue; + } + + if (vir_has_implicit_uniform(inst) && + i == vir_get_implicit_uniform_src(inst)) { + /* No turning the implicit uniform read into + * an immediate. + */ + continue; + } + + /* Check if the uniform is suitable as a small + * immediate. + */ + uint32_t imm = c->uniform_data[src.index]; + 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; +} |