/* * Copyright © 2014 Intel Corporation * * 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. * * Authors: * Jason Ekstrand (jason@jlekstrand.net) * */ #include #include "nir_search.h" #include "nir_builder.h" #include "util/half_float.h" #define NIR_SEARCH_MAX_COMM_OPS 4 struct match_state { bool inexact_match; bool has_exact_alu; uint8_t comm_op_direction; unsigned variables_seen; nir_alu_src variables[NIR_SEARCH_MAX_VARIABLES]; }; static bool match_expression(const nir_search_expression *expr, nir_alu_instr *instr, unsigned num_components, const uint8_t *swizzle, struct match_state *state); static const uint8_t identity_swizzle[NIR_MAX_VEC_COMPONENTS] = { 0, 1, 2, 3 }; /** * Check if a source produces a value of the given type. * * Used for satisfying 'a@type' constraints. */ static bool src_is_type(nir_src src, nir_alu_type type) { assert(type != nir_type_invalid); if (!src.is_ssa) return false; if (src.ssa->parent_instr->type == nir_instr_type_alu) { nir_alu_instr *src_alu = nir_instr_as_alu(src.ssa->parent_instr); nir_alu_type output_type = nir_op_infos[src_alu->op].output_type; if (type == nir_type_bool) { switch (src_alu->op) { case nir_op_iand: case nir_op_ior: case nir_op_ixor: return src_is_type(src_alu->src[0].src, nir_type_bool) && src_is_type(src_alu->src[1].src, nir_type_bool); case nir_op_inot: return src_is_type(src_alu->src[0].src, nir_type_bool); default: break; } } return nir_alu_type_get_base_type(output_type) == type; } else if (src.ssa->parent_instr->type == nir_instr_type_intrinsic) { nir_intrinsic_instr *intr = nir_instr_as_intrinsic(src.ssa->parent_instr); if (type == nir_type_bool) { return intr->intrinsic == nir_intrinsic_load_front_face || intr->intrinsic == nir_intrinsic_load_helper_invocation; } } /* don't know */ return false; } static bool nir_op_matches_search_op(nir_op nop, uint16_t sop) { if (sop <= nir_last_opcode) return nop == sop; #define MATCH_FCONV_CASE(op) \ case nir_search_op_##op: \ return nop == nir_op_##op##16 || \ nop == nir_op_##op##32 || \ nop == nir_op_##op##64; #define MATCH_ICONV_CASE(op) \ case nir_search_op_##op: \ return nop == nir_op_##op##8 || \ nop == nir_op_##op##16 || \ nop == nir_op_##op##32 || \ nop == nir_op_##op##64; #define MATCH_BCONV_CASE(op) \ case nir_search_op_##op: \ return nop == nir_op_##op##1 || \ nop == nir_op_##op##32; switch (sop) { MATCH_FCONV_CASE(i2f) MATCH_FCONV_CASE(u2f) MATCH_FCONV_CASE(f2f) MATCH_ICONV_CASE(f2u) MATCH_ICONV_CASE(f2i) MATCH_ICONV_CASE(u2u) MATCH_ICONV_CASE(i2i) MATCH_FCONV_CASE(b2f) MATCH_ICONV_CASE(b2i) MATCH_BCONV_CASE(i2b) MATCH_BCONV_CASE(f2b) default: unreachable("Invalid nir_search_op"); } #undef MATCH_FCONV_CASE #undef MATCH_ICONV_CASE } static nir_op nir_op_for_search_op(uint16_t sop, unsigned bit_size) { if (sop <= nir_last_opcode) return sop; #define RET_FCONV_CASE(op) \ case nir_search_op_##op: \ switch (bit_size) { \ case 16: return nir_op_##op##16; \ case 32: return nir_op_##op##32; \ case 64: return nir_op_##op##64; \ default: unreachable("Invalid bit size"); \ } #define RET_ICONV_CASE(op) \ case nir_search_op_##op: \ switch (bit_size) { \ case 8: return nir_op_##op##8; \ case 16: return nir_op_##op##16; \ case 32: return nir_op_##op##32; \ case 64: return nir_op_##op##64; \ default: unreachable("Invalid bit size"); \ } #define RET_BCONV_CASE(op) \ case nir_search_op_##op: \ switch (bit_size) { \ case 1: return nir_op_##op##1; \ case 32: return nir_op_##op##32; \ default: unreachable("Invalid bit size"); \ } switch (sop) { RET_FCONV_CASE(i2f) RET_FCONV_CASE(u2f) RET_FCONV_CASE(f2f) RET_ICONV_CASE(f2u) RET_ICONV_CASE(f2i) RET_ICONV_CASE(u2u) RET_ICONV_CASE(i2i) RET_FCONV_CASE(b2f) RET_ICONV_CASE(b2i) RET_BCONV_CASE(i2b) RET_BCONV_CASE(f2b) default: unreachable("Invalid nir_search_op"); } #undef RET_FCONV_CASE #undef RET_ICONV_CASE } static bool match_value(const nir_search_value *value, nir_alu_instr *instr, unsigned src, unsigned num_components, const uint8_t *swizzle, struct match_state *state) { uint8_t new_swizzle[NIR_MAX_VEC_COMPONENTS]; /* Searching only works on SSA values because, if it's not SSA, we can't * know if the value changed between one instance of that value in the * expression and another. Also, the replace operation will place reads of * that value right before the last instruction in the expression we're * replacing so those reads will happen after the original reads and may * not be valid if they're register reads. */ assert(instr->src[src].src.is_ssa); /* If the source is an explicitly sized source, then we need to reset * both the number of components and the swizzle. */ if (nir_op_infos[instr->op].input_sizes[src] != 0) { num_components = nir_op_infos[instr->op].input_sizes[src]; swizzle = identity_swizzle; } for (unsigned i = 0; i < num_components; ++i) new_swizzle[i] = instr->src[src].swizzle[swizzle[i]]; /* If the value has a specific bit size and it doesn't match, bail */ if (value->bit_size > 0 && nir_src_bit_size(instr->src[src].src) != value->bit_size) return false; switch (value->type) { case nir_search_value_expression: if (instr->src[src].src.ssa->parent_instr->type != nir_instr_type_alu) return false; return match_expression(nir_search_value_as_expression(value), nir_instr_as_alu(instr->src[src].src.ssa->parent_instr), num_components, new_swizzle, state); case nir_search_value_variable: { nir_search_variable *var = nir_search_value_as_variable(value); assert(var->variable < NIR_SEARCH_MAX_VARIABLES); if (state->variables_seen & (1 << var->variable)) { if (state->variables[var->variable].src.ssa != instr->src[src].src.ssa) return false; assert(!instr->src[src].abs && !instr->src[src].negate); for (unsigned i = 0; i < num_components; ++i) { if (state->variables[var->variable].swizzle[i] != new_swizzle[i]) return false; } return true; } else { if (var->is_constant && instr->src[src].src.ssa->parent_instr->type != nir_instr_type_load_const) return false; if (var->cond && !var->cond(instr, src, num_components, new_swizzle)) return false; if (var->type != nir_type_invalid && !src_is_type(instr->src[src].src, var->type)) return false; state->variables_seen |= (1 << var->variable); state->variables[var->variable].src = instr->src[src].src; state->variables[var->variable].abs = false; state->variables[var->variable].negate = false; for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; ++i) { if (i < num_components) state->variables[var->variable].swizzle[i] = new_swizzle[i]; else state->variables[var->variable].swizzle[i] = 0; } return true; } } case nir_search_value_constant: { nir_search_constant *const_val = nir_search_value_as_constant(value); if (!nir_src_is_const(instr->src[src].src)) return false; switch (const_val->type) { case nir_type_float: for (unsigned i = 0; i < num_components; ++i) { double val = nir_src_comp_as_float(instr->src[src].src, new_swizzle[i]); if (val != const_val->data.d) return false; } return true; case nir_type_int: case nir_type_uint: case nir_type_bool: { unsigned bit_size = nir_src_bit_size(instr->src[src].src); uint64_t mask = bit_size == 64 ? UINT64_MAX : (1ull << bit_size) - 1; for (unsigned i = 0; i < num_components; ++i) { uint64_t val = nir_src_comp_as_uint(instr->src[src].src, new_swizzle[i]); if ((val & mask) != (const_val->data.u & mask)) return false; } return true; } default: unreachable("Invalid alu source type"); } } default: unreachable("Invalid search value type"); } } static bool match_expression(const nir_search_expression *expr, nir_alu_instr *instr, unsigned num_components, const uint8_t *swizzle, struct match_state *state) { if (expr->cond && !expr->cond(instr)) return false; if (!nir_op_matches_search_op(instr->op, expr->opcode)) return false; assert(instr->dest.dest.is_ssa); if (expr->value.bit_size > 0 && instr->dest.dest.ssa.bit_size != expr->value.bit_size) return false; state->inexact_match = expr->inexact || state->inexact_match; state->has_exact_alu = instr->exact || state->has_exact_alu; if (state->inexact_match && state->has_exact_alu) return false; assert(!instr->dest.saturate); assert(nir_op_infos[instr->op].num_inputs > 0); /* If we have an explicitly sized destination, we can only handle the * identity swizzle. While dot(vec3(a, b, c).zxy) is a valid * expression, we don't have the information right now to propagate that * swizzle through. We can only properly propagate swizzles if the * instruction is vectorized. */ if (nir_op_infos[instr->op].output_size != 0) { for (unsigned i = 0; i < num_components; i++) { if (swizzle[i] != i) return false; } } /* If this is a commutative expression and it's one of the first few, look * up its direction for the current search operation. We'll use that value * to possibly flip the sources for the match. */ unsigned comm_op_flip = (expr->comm_expr_idx >= 0 && expr->comm_expr_idx < NIR_SEARCH_MAX_COMM_OPS) ? ((state->comm_op_direction >> expr->comm_expr_idx) & 1) : 0; bool matched = true; for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) { if (!match_value(expr->srcs[i], instr, i ^ comm_op_flip, num_components, swizzle, state)) { matched = false; break; } } return matched; } static unsigned replace_bitsize(const nir_search_value *value, unsigned search_bitsize, struct match_state *state) { if (value->bit_size > 0) return value->bit_size; if (value->bit_size < 0) return nir_src_bit_size(state->variables[-value->bit_size - 1].src); return search_bitsize; } static nir_alu_src construct_value(nir_builder *build, const nir_search_value *value, unsigned num_components, unsigned search_bitsize, struct match_state *state, nir_instr *instr) { switch (value->type) { case nir_search_value_expression: { const nir_search_expression *expr = nir_search_value_as_expression(value); unsigned dst_bit_size = replace_bitsize(value, search_bitsize, state); nir_op op = nir_op_for_search_op(expr->opcode, dst_bit_size); if (nir_op_infos[op].output_size != 0) num_components = nir_op_infos[op].output_size; nir_alu_instr *alu = nir_alu_instr_create(build->shader, op); nir_ssa_dest_init(&alu->instr, &alu->dest.dest, num_components, dst_bit_size, NULL); alu->dest.write_mask = (1 << num_components) - 1; alu->dest.saturate = false; /* We have no way of knowing what values in a given search expression * map to a particular replacement value. Therefore, if the * expression we are replacing has any exact values, the entire * replacement should be exact. */ alu->exact = state->has_exact_alu; for (unsigned i = 0; i < nir_op_infos[op].num_inputs; i++) { /* If the source is an explicitly sized source, then we need to reset * the number of components to match. */ if (nir_op_infos[alu->op].input_sizes[i] != 0) num_components = nir_op_infos[alu->op].input_sizes[i]; alu->src[i] = construct_value(build, expr->srcs[i], num_components, search_bitsize, state, instr); } nir_builder_instr_insert(build, &alu->instr); nir_alu_src val; val.src = nir_src_for_ssa(&alu->dest.dest.ssa); val.negate = false; val.abs = false, memcpy(val.swizzle, identity_swizzle, sizeof val.swizzle); return val; } case nir_search_value_variable: { const nir_search_variable *var = nir_search_value_as_variable(value); assert(state->variables_seen & (1 << var->variable)); nir_alu_src val = { NIR_SRC_INIT }; nir_alu_src_copy(&val, &state->variables[var->variable], (void *)build->shader); assert(!var->is_constant); return val; } case nir_search_value_constant: { const nir_search_constant *c = nir_search_value_as_constant(value); unsigned bit_size = replace_bitsize(value, search_bitsize, state); nir_ssa_def *cval; switch (c->type) { case nir_type_float: cval = nir_imm_floatN_t(build, c->data.d, bit_size); break; case nir_type_int: case nir_type_uint: cval = nir_imm_intN_t(build, c->data.i, bit_size); break; case nir_type_bool: cval = nir_imm_boolN_t(build, c->data.u, bit_size); break; default: unreachable("Invalid alu source type"); } nir_alu_src val; val.src = nir_src_for_ssa(cval); val.negate = false; val.abs = false, memset(val.swizzle, 0, sizeof val.swizzle); return val; } default: unreachable("Invalid search value type"); } } nir_ssa_def * nir_replace_instr(nir_builder *build, nir_alu_instr *instr, const nir_search_expression *search, const nir_search_value *replace) { uint8_t swizzle[NIR_MAX_VEC_COMPONENTS] = { 0 }; for (unsigned i = 0; i < instr->dest.dest.ssa.num_components; ++i) swizzle[i] = i; assert(instr->dest.dest.is_ssa); struct match_state state; state.inexact_match = false; state.has_exact_alu = false; unsigned comm_expr_combinations = 1 << MIN2(search->comm_exprs, NIR_SEARCH_MAX_COMM_OPS); bool found = false; for (unsigned comb = 0; comb < comm_expr_combinations; comb++) { /* The bitfield of directions is just the current iteration. Hooray for * binary. */ state.comm_op_direction = comb; state.variables_seen = 0; if (match_expression(search, instr, instr->dest.dest.ssa.num_components, swizzle, &state)) { found = true; break; } } if (!found) return NULL; build->cursor = nir_before_instr(&instr->instr); nir_alu_src val = construct_value(build, replace, instr->dest.dest.ssa.num_components, instr->dest.dest.ssa.bit_size, &state, &instr->instr); /* Inserting a mov may be unnecessary. However, it's much easier to * simply let copy propagation clean this up than to try to go through * and rewrite swizzles ourselves. */ nir_ssa_def *ssa_val = nir_imov_alu(build, val, instr->dest.dest.ssa.num_components); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(ssa_val)); /* We know this one has no more uses because we just rewrote them all, * so we can remove it. The rest of the matched expression, however, we * don't know so much about. We'll just let dead code clean them up. */ nir_instr_remove(&instr->instr); return ssa_val; }