From 443c5a3cd62d55c7969c873d21bc1af2ee21a600 Mon Sep 17 00:00:00 2001 From: Vasily Khoruzhick Date: Tue, 30 Apr 2019 22:25:05 -0700 Subject: [PATCH] nir: add int_to_float lowering pass This new pass lowers ints and bools to floats. It allows hardware that doesn't have native integers (e.g. Mali4x0) use the same code paths as modern hardware. It uses newly introduced pass to gather SSA types and should be used as late as possible. Reviewed-by: Jason Ekstrand Reviewed-by: Christian Gmeiner Signed-off-by: Vasily Khoruzhick --- src/compiler/Makefile.sources | 1 + src/compiler/nir/meson.build | 1 + src/compiler/nir/nir.h | 1 + src/compiler/nir/nir_lower_int_to_float.c | 212 ++++++++++++++++++++++++++++++ 4 files changed, 215 insertions(+) create mode 100644 src/compiler/nir/nir_lower_int_to_float.c diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources index 0052567..7a2f790 100644 --- a/src/compiler/Makefile.sources +++ b/src/compiler/Makefile.sources @@ -254,6 +254,7 @@ NIR_FILES = \ nir/nir_lower_idiv.c \ nir/nir_lower_indirect_derefs.c \ nir/nir_lower_int64.c \ + nir/nir_lower_int_to_float.c \ nir/nir_lower_io.c \ nir/nir_lower_io_arrays_to_elements.c \ nir/nir_lower_io_to_temporaries.c \ diff --git a/src/compiler/nir/meson.build b/src/compiler/nir/meson.build index a8faeb9..6ea2776 100644 --- a/src/compiler/nir/meson.build +++ b/src/compiler/nir/meson.build @@ -134,6 +134,7 @@ files_libnir = files( 'nir_lower_idiv.c', 'nir_lower_indirect_derefs.c', 'nir_lower_int64.c', + 'nir_lower_int_to_float.c', 'nir_lower_io.c', 'nir_lower_io_arrays_to_elements.c', 'nir_lower_io_to_temporaries.c', diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h index 37161e8..450f10a 100644 --- a/src/compiler/nir/nir.h +++ b/src/compiler/nir/nir.h @@ -3183,6 +3183,7 @@ bool nir_lower_alu(nir_shader *shader); bool nir_lower_alu_to_scalar(nir_shader *shader); bool nir_lower_bool_to_float(nir_shader *shader); bool nir_lower_bool_to_int32(nir_shader *shader); +bool nir_lower_int_to_float(nir_shader *shader); bool nir_lower_load_const_to_scalar(nir_shader *shader); bool nir_lower_read_invocation_to_scalar(nir_shader *shader); bool nir_lower_phis_to_scalar(nir_shader *shader); diff --git a/src/compiler/nir/nir_lower_int_to_float.c b/src/compiler/nir/nir_lower_int_to_float.c new file mode 100644 index 0000000..439afa0 --- /dev/null +++ b/src/compiler/nir/nir_lower_int_to_float.c @@ -0,0 +1,212 @@ +/* + * Copyright © 2018 Intel Corporation + * Copyright © 2019 Vasily Khoruzhick + * + * 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_ssa_def *def, void *arg) +{ + BITSET_WORD *int_types = arg; + assert(!BITSET_TEST(int_types, def->index)); + return true; +} + +static bool +rewrite_bool_ssa_def_to_float(nir_ssa_def *def, void *_progress) +{ + bool *progress = _progress; + if (def->bit_size == 1) { + def->bit_size = 32; + *progress = true; + } + return true; +} + +static bool +lower_alu_instr(nir_builder *b, nir_alu_instr *alu) +{ + const nir_op_info *op_info = &nir_op_infos[alu->op]; + + b->cursor = nir_before_instr(&alu->instr); + + /* Replacement SSA value */ + nir_ssa_def *rep = NULL; + switch (alu->op) { + case nir_op_vec2: + case nir_op_vec3: + case nir_op_vec4: + /* These we expect to have integers or booleans but the opcode doesn't change */ + break; + + case nir_op_b2f32: alu->op = nir_op_fmov; break; + case nir_op_b2i32: alu->op = nir_op_fmov; break; + case nir_op_i2f32: alu->op = nir_op_fmov; break; + case nir_op_f2i32: alu->op = nir_op_fmov; break; + case nir_op_f2i1: + case nir_op_f2b1: + case nir_op_i2b1: + rep = nir_sne(b, nir_ssa_for_alu_src(b, alu, 0), + nir_imm_float(b, 0)); + break; + + case nir_op_flt: alu->op = nir_op_slt; break; + case nir_op_fge: alu->op = nir_op_sge; break; + case nir_op_feq: alu->op = nir_op_seq; break; + case nir_op_fne: alu->op = nir_op_sne; break; + case nir_op_ilt: alu->op = nir_op_slt; break; + case nir_op_ige: alu->op = nir_op_sge; break; + case nir_op_ieq: alu->op = nir_op_seq; break; + case nir_op_ine: alu->op = nir_op_sne; break; + case nir_op_ult: alu->op = nir_op_slt; break; + case nir_op_uge: alu->op = nir_op_sge; break; + case nir_op_ineg: alu->op = nir_op_fneg; break; + + case nir_op_ball_fequal2: alu->op = nir_op_fall_equal2; break; + case nir_op_ball_fequal3: alu->op = nir_op_fall_equal3; break; + case nir_op_ball_fequal4: alu->op = nir_op_fall_equal4; break; + case nir_op_bany_fnequal2: alu->op = nir_op_fany_nequal2; break; + case nir_op_bany_fnequal3: alu->op = nir_op_fany_nequal3; break; + case nir_op_bany_fnequal4: alu->op = nir_op_fany_nequal4; break; + case nir_op_ball_iequal2: alu->op = nir_op_fall_equal2; break; + case nir_op_ball_iequal3: alu->op = nir_op_fall_equal3; break; + case nir_op_ball_iequal4: alu->op = nir_op_fall_equal4; break; + case nir_op_bany_inequal2: alu->op = nir_op_fany_nequal2; break; + case nir_op_bany_inequal3: alu->op = nir_op_fany_nequal3; break; + case nir_op_bany_inequal4: alu->op = nir_op_fany_nequal4; break; + + case nir_op_bcsel: alu->op = nir_op_fcsel; 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_imov: alu->op = nir_op_fmov; break; + case nir_op_iand: alu->op = nir_op_fmul; break; + case nir_op_ixor: alu->op = nir_op_sne; break; + case nir_op_ior: alu->op = nir_op_fmax; break; + + case nir_op_idiv: + rep = nir_ftrunc(b, nir_fdiv(b, + nir_ssa_for_alu_src(b, alu, 0), + nir_ssa_for_alu_src(b, alu, 1))); + break; + + case nir_op_inot: + rep = nir_seq(b, nir_ssa_for_alu_src(b, alu, 0), + nir_imm_float(b, 0)); + break; + + default: + assert(alu->dest.dest.ssa.bit_size > 1); + for (unsigned i = 0; i < op_info->num_inputs; i++) + assert(alu->src[i].src.ssa->bit_size > 1); + return false; + } + + if (rep) { + /* We've emitted a replacement instruction */ + nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, nir_src_for_ssa(rep)); + nir_instr_remove(&alu->instr); + } else { + if (alu->dest.dest.ssa.bit_size == 1) + alu->dest.dest.ssa.bit_size = 32; + } + + 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_init(&b, 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_ssa_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) { + for (unsigned i = 0; i < load->def.num_components; i++) + load->value[i].f32 = load->value[i].b ? 1.0 : 0.0; + load->def.bit_size = 32; + } else if (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_ssa_undef: + case nir_instr_type_phi: + case nir_instr_type_tex: + nir_foreach_ssa_def(instr, rewrite_bool_ssa_def_to_float, + &progress); + break; + + default: + nir_foreach_ssa_def(instr, assert_ssa_def_is_not_int, (void *)int_types); + break; + } + } + } + + if (progress) { + nir_metadata_preserve(impl, nir_metadata_block_index | + nir_metadata_dominance); + } + + free(float_types); + free(int_types); + + return progress; +} + +bool +nir_lower_int_to_float(nir_shader *shader) +{ + bool progress = false; + + nir_foreach_function(function, shader) { + if (function->impl && nir_lower_int_to_float_impl(function->impl)) + progress = true; + } + + return progress; +} -- 2.7.4