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/*
* Copyright (C) 2018 Alyssa Rosenzweig
* Copyright (C) 2019 Collabora, Ltd.
*
* 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 "compiler.h"
#include "midgard_ops.h"
bool
midgard_opt_copy_prop(compiler_context *ctx, midgard_block *block)
{
bool progress = false;
mir_foreach_instr_in_block_safe(block, ins) {
if (ins->type != TAG_ALU_4) continue;
if (!OP_IS_MOVE(ins->alu.op)) continue;
unsigned from = ins->src[1];
unsigned to = ins->dest;
/* We only work on pure SSA */
if (to >= SSA_FIXED_MINIMUM) continue;
if (from >= SSA_FIXED_MINIMUM) continue;
if (to & IS_REG) continue;
if (from & IS_REG) continue;
/* Constant propagation is not handled here, either */
if (ins->has_inline_constant) continue;
if (ins->has_constants) continue;
/* Modifier propagation is not handled here */
if (mir_nontrivial_source2_mod_simple(ins)) continue;
if (mir_nontrivial_outmod(ins)) continue;
/* Shortened arguments (bias for textures, extra load/store
* arguments, etc.) do not get a swizzle, only a start
* component and even that is restricted. Fragment writeout
* doesn't even get that much */
bool skip = false;
mir_foreach_instr_global(ctx, q) {
bool is_tex = q->type == TAG_TEXTURE_4;
bool is_ldst = q->type == TAG_LOAD_STORE_4;
bool is_branch = q->compact_branch;
if (!(is_tex || is_ldst || is_branch)) continue;
/* For textures, we get one real swizzle. For stores,
* we also get one. For loads, we get none. */
unsigned start =
is_tex ? 1 :
OP_IS_STORE(q->load_store.op) ? 1 : 0;
mir_foreach_src(q, s) {
if ((s >= start) && q->src[s] == to) {
skip = true;
break;
}
}
}
if (skip)
continue;
/* We're clear -- rewrite, composing the swizzle */
mir_rewrite_index_src_swizzle(ctx, to, from, ins->swizzle[1]);
mir_remove_instruction(ins);
progress |= true;
}
return progress;
}
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