| /* |
| * Copyright © 2018 Intel Corporation |
| * Copyright © 2019 Vasily Khoruzhick <anarsoul@gmail.com> |
| * |
| * 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. |
| */ |
| |
| #include "nir.h" |
| #include "nir_builder.h" |
| |
| static bool |
| assert_ssa_def_is_not_int(nir_def *def, void *arg) |
| { |
| ASSERTED BITSET_WORD *int_types = arg; |
| assert(!BITSET_TEST(int_types, def->index)); |
| return true; |
| } |
| |
| static bool |
| instr_has_only_trivial_swizzles(nir_alu_instr *alu) |
| { |
| const nir_op_info *info = &nir_op_infos[alu->op]; |
| |
| for (unsigned i = 0; i < info->num_inputs; i++) { |
| for (unsigned chan = 0; chan < alu->def.num_components; chan++) { |
| if (alu->src[i].swizzle[chan] != chan) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /* Recognize the y = x - ffract(x) patterns from lowered ffloor. |
| * It only works for the simple case when no swizzling is involved. |
| */ |
| static bool |
| check_for_lowered_ffloor(nir_alu_instr *fadd) |
| { |
| if (!instr_has_only_trivial_swizzles(fadd)) |
| return false; |
| |
| nir_alu_instr *fneg = NULL; |
| nir_src x; |
| for (unsigned i = 0; i < 2; i++) { |
| nir_alu_instr *fadd_src_alu = nir_src_as_alu_instr(fadd->src[i].src); |
| if (fadd_src_alu && fadd_src_alu->op == nir_op_fneg) { |
| fneg = fadd_src_alu; |
| x = fadd->src[1 - i].src; |
| } |
| } |
| |
| if (!fneg || !instr_has_only_trivial_swizzles(fneg)) |
| return false; |
| |
| nir_alu_instr *ffract = nir_src_as_alu_instr(fneg->src[0].src); |
| if (ffract && ffract->op == nir_op_ffract && |
| nir_srcs_equal(ffract->src[0].src, x) && |
| instr_has_only_trivial_swizzles(ffract)) |
| return true; |
| |
| return false; |
| } |
| |
| static bool |
| lower_alu_instr(nir_builder *b, nir_alu_instr *alu) |
| { |
| const nir_op_info *info = &nir_op_infos[alu->op]; |
| |
| bool is_bool_only = alu->def.bit_size == 1; |
| for (unsigned i = 0; i < info->num_inputs; i++) { |
| if (alu->src[i].src.ssa->bit_size != 1) |
| is_bool_only = false; |
| } |
| |
| if (is_bool_only) { |
| /* avoid lowering integers ops are used for booleans (ieq,ine,etc) */ |
| return false; |
| } |
| |
| b->cursor = nir_before_instr(&alu->instr); |
| |
| /* Replacement SSA value */ |
| nir_def *rep = NULL; |
| switch (alu->op) { |
| case nir_op_mov: |
| case nir_op_vec2: |
| case nir_op_vec3: |
| case nir_op_vec4: |
| case nir_op_bcsel: |
| /* These we expect to have integers but the opcode doesn't change */ |
| break; |
| |
| case nir_op_b2i32: |
| alu->op = nir_op_b2f32; |
| break; |
| case nir_op_i2f32: |
| alu->op = nir_op_mov; |
| break; |
| case nir_op_u2f32: |
| alu->op = nir_op_mov; |
| break; |
| |
| case nir_op_f2i32: { |
| alu->op = nir_op_ftrunc; |
| |
| /* If the source was already integer, then we did't need to truncate and |
| * can switch it to a mov that can be copy-propagated away. |
| */ |
| nir_alu_instr *src_alu = nir_src_as_alu_instr(alu->src[0].src); |
| if (src_alu) { |
| switch (src_alu->op) { |
| /* Check for the y = x - ffract(x) patterns from lowered ffloor. */ |
| case nir_op_fadd: |
| if (check_for_lowered_ffloor(src_alu)) |
| alu->op = nir_op_mov; |
| break; |
| case nir_op_fround_even: |
| case nir_op_fceil: |
| case nir_op_ftrunc: |
| case nir_op_ffloor: |
| alu->op = nir_op_mov; |
| break; |
| default: |
| break; |
| } |
| } |
| break; |
| } |
| |
| case nir_op_f2u32: |
| alu->op = nir_op_ffloor; |
| break; |
| |
| case nir_op_ilt: |
| alu->op = nir_op_flt; |
| break; |
| case nir_op_ige: |
| alu->op = nir_op_fge; |
| break; |
| case nir_op_ieq: |
| alu->op = nir_op_feq; |
| break; |
| case nir_op_ine: |
| alu->op = nir_op_fneu; |
| break; |
| case nir_op_ult: |
| alu->op = nir_op_flt; |
| break; |
| case nir_op_uge: |
| alu->op = nir_op_fge; |
| break; |
| |
| case nir_op_iadd: |
| alu->op = nir_op_fadd; |
| break; |
| case nir_op_isub: |
| alu->op = nir_op_fsub; |
| break; |
| case nir_op_imul: |
| alu->op = nir_op_fmul; |
| break; |
| |
| case nir_op_idiv: { |
| nir_def *x = nir_ssa_for_alu_src(b, alu, 0); |
| nir_def *y = nir_ssa_for_alu_src(b, alu, 1); |
| |
| /* Hand-lower fdiv, since lower_int_to_float is after nir_opt_algebraic. */ |
| if (b->shader->options->lower_fdiv) { |
| rep = nir_ftrunc(b, nir_fmul(b, x, nir_frcp(b, y))); |
| } else { |
| rep = nir_ftrunc(b, nir_fdiv(b, x, y)); |
| } |
| break; |
| } |
| |
| case nir_op_iabs: |
| alu->op = nir_op_fabs; |
| break; |
| case nir_op_ineg: |
| alu->op = nir_op_fneg; |
| break; |
| case nir_op_imax: |
| alu->op = nir_op_fmax; |
| break; |
| case nir_op_imin: |
| alu->op = nir_op_fmin; |
| break; |
| case nir_op_umax: |
| alu->op = nir_op_fmax; |
| break; |
| case nir_op_umin: |
| alu->op = nir_op_fmin; |
| break; |
| |
| case nir_op_ball_iequal2: |
| alu->op = nir_op_ball_fequal2; |
| break; |
| case nir_op_ball_iequal3: |
| alu->op = nir_op_ball_fequal3; |
| break; |
| case nir_op_ball_iequal4: |
| alu->op = nir_op_ball_fequal4; |
| break; |
| case nir_op_bany_inequal2: |
| alu->op = nir_op_bany_fnequal2; |
| break; |
| case nir_op_bany_inequal3: |
| alu->op = nir_op_bany_fnequal3; |
| break; |
| case nir_op_bany_inequal4: |
| alu->op = nir_op_bany_fnequal4; |
| break; |
| |
| case nir_op_i32csel_gt: |
| alu->op = nir_op_fcsel_gt; |
| break; |
| case nir_op_i32csel_ge: |
| alu->op = nir_op_fcsel_ge; |
| break; |
| |
| default: |
| assert(nir_alu_type_get_base_type(info->output_type) != nir_type_int && |
| nir_alu_type_get_base_type(info->output_type) != nir_type_uint); |
| for (unsigned i = 0; i < info->num_inputs; i++) { |
| assert(nir_alu_type_get_base_type(info->input_types[i]) != nir_type_int && |
| nir_alu_type_get_base_type(info->input_types[i]) != nir_type_uint); |
| } |
| return false; |
| } |
| |
| if (rep) { |
| /* We've emitted a replacement instruction */ |
| nir_def_replace(&alu->def, rep); |
| } |
| |
| return true; |
| } |
| |
| static bool |
| nir_lower_int_to_float_impl(nir_function_impl *impl) |
| { |
| bool progress = false; |
| BITSET_WORD *float_types = NULL, *int_types = NULL; |
| |
| nir_builder b = nir_builder_create(impl); |
| |
| nir_index_ssa_defs(impl); |
| float_types = calloc(BITSET_WORDS(impl->ssa_alloc), |
| sizeof(BITSET_WORD)); |
| int_types = calloc(BITSET_WORDS(impl->ssa_alloc), |
| sizeof(BITSET_WORD)); |
| nir_gather_types(impl, float_types, int_types); |
| |
| nir_foreach_block(block, impl) { |
| nir_foreach_instr_safe(instr, block) { |
| switch (instr->type) { |
| case nir_instr_type_alu: |
| progress |= lower_alu_instr(&b, nir_instr_as_alu(instr)); |
| break; |
| |
| case nir_instr_type_load_const: { |
| nir_load_const_instr *load = nir_instr_as_load_const(instr); |
| if (load->def.bit_size != 1 && BITSET_TEST(int_types, load->def.index)) { |
| for (unsigned i = 0; i < load->def.num_components; i++) |
| load->value[i].f32 = load->value[i].i32; |
| } |
| break; |
| } |
| |
| case nir_instr_type_intrinsic: |
| case nir_instr_type_undef: |
| case nir_instr_type_phi: |
| case nir_instr_type_tex: |
| break; |
| |
| default: |
| nir_foreach_def(instr, assert_ssa_def_is_not_int, (void *)int_types); |
| break; |
| } |
| } |
| } |
| |
| nir_progress(progress, impl, nir_metadata_control_flow); |
| |
| free(float_types); |
| free(int_types); |
| |
| return progress; |
| } |
| |
| bool |
| nir_lower_int_to_float(nir_shader *shader) |
| { |
| bool progress = false; |
| |
| nir_foreach_function_impl(impl, shader) { |
| if (nir_lower_int_to_float_impl(impl)) |
| progress = true; |
| } |
| |
| return progress; |
| } |
