98 lines
3.8 KiB
C
98 lines
3.8 KiB
C
/*
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* Copyright (C) 2018 Alyssa Rosenzweig
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* Copyright (C) 2019 Collabora, Ltd.
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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 FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "compiler.h"
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#include "midgard_ops.h"
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bool
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midgard_opt_copy_prop(compiler_context *ctx, midgard_block *block)
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{
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bool progress = false;
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mir_foreach_instr_in_block_safe(block, ins) {
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if (ins->type != TAG_ALU_4) continue;
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if (!OP_IS_MOVE(ins->op)) continue;
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if (ins->is_pack) continue;
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unsigned from = ins->src[1];
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unsigned to = ins->dest;
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/* We only work on pure SSA */
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if (to & PAN_IS_REG) continue;
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if (from & PAN_IS_REG) continue;
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/* Constant propagation is not handled here, either */
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if (ins->has_inline_constant) continue;
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if (ins->has_constants) continue;
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/* Modifier propagation is not handled here */
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if (mir_nontrivial_mod(ins, 1, false)) continue;
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if (mir_nontrivial_outmod(ins)) continue;
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/* Shortened arguments (bias for textures, extra load/store
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* arguments, etc.) do not get a swizzle, only a start
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* component and even that is restricted. Fragment writeout
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* doesn't even get that much */
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bool skip = false;
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mir_foreach_instr_global(ctx, q) {
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bool is_tex = q->type == TAG_TEXTURE_4;
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bool is_ldst = q->type == TAG_LOAD_STORE_4;
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bool is_branch = q->compact_branch;
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if (!(is_tex || is_ldst || is_branch)) continue;
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/* For textures, we get a real swizzle for the
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* coordinate and the content. For stores, we get one.
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* For loads, we get none. */
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unsigned start =
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is_tex ? 2 :
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OP_IS_STORE(q->op) ? 1 : 0;
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mir_foreach_src(q, s) {
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if ((s >= start) && q->src[s] == to) {
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skip = true;
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break;
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}
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}
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}
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if (skip)
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continue;
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if (ctx->blend_src1 == to)
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ctx->blend_src1 = from;
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/* We're clear -- rewrite, composing the swizzle */
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mir_rewrite_index_src_swizzle(ctx, to, from, ins->swizzle[1]);
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mir_remove_instruction(ins);
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progress |= true;
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}
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return progress;
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}
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