3488a3f033
LLVM can't shrink loads. Polaris10: Totals from affected shaders: SGPRS: 62528 -> 59955 (-4.11 %) VGPRS: 44708 -> 44616 (-0.21 %) Spilled SGPRs: 16 -> 8 (-50.00 %) Code Size: 1355504 -> 1355172 (-0.02 %) bytes Max Waves: 11710 -> 11670 (-0.34 %) Vega10: Totals from affected shaders: SGPRS: 51448 -> 50371 (-2.09 %) VGPRS: 39140 -> 39048 (-0.24 %) Spilled SGPRs: 16 -> 16 (0.00 %) Code Size: 1307188 -> 1304296 (-0.22 %) bytes Max Waves: 11312 -> 11292 (-0.18 %) This reduces SGPRs spilling in MadMax, and it also reduces number of SGPRs in DOW3 and F12017. The number of waves slightly decreases in F1 but I don't see any performance changes after benchmarking it. Talos and Serious Sam are not affected because they don't use any push constants. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* Copyright © 2018 Valve Corporation
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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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#include "nir.h"
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static bool
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opt_shrink_load(nir_intrinsic_instr *instr)
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{
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bool progress = false;
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if (instr->intrinsic == nir_intrinsic_load_push_constant) {
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unsigned mask = nir_ssa_def_components_read(&instr->dest.ssa);
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if (instr->num_components > util_last_bit(mask)) {
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instr->num_components = util_last_bit(mask);
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instr->dest.ssa.num_components = instr->num_components;
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progress = true;
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}
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}
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return progress;
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}
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bool
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nir_opt_shrink_load(nir_shader *shader)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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progress |= opt_shrink_load(nir_instr_as_intrinsic(instr));
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}
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}
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nir_metadata_preserve(function->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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return progress;
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}
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