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/*
* Copyright (C) 2019 Alyssa Rosenzweig <alyssa@rosenzweig.io>
*
* 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"
void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new)
{
if (ins->ssa_args.src0 == old)
ins->ssa_args.src0 = new;
if (ins->ssa_args.src1 == old &&
!ins->ssa_args.inline_constant)
ins->ssa_args.src1 = new;
}
void
mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new)
{
mir_foreach_instr_global(ctx, ins) {
mir_rewrite_index_src_single(ins, old, new);
}
}
void
mir_rewrite_index_src_tag(compiler_context *ctx, unsigned old, unsigned new, unsigned tag)
{
mir_foreach_instr_global(ctx, ins) {
if (ins->type != tag)
continue;
mir_rewrite_index_src_single(ins, old, new);
}
}
void
mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new)
{
mir_foreach_instr_global(ctx, ins) {
if (ins->ssa_args.dest == old)
ins->ssa_args.dest = new;
}
}
void
mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new)
{
mir_rewrite_index_src(ctx, old, new);
mir_rewrite_index_dst(ctx, old, new);
}
/* Checks if a value is used only once (or totally dead), which is an important
* heuristic to figure out if certain optimizations are Worth It (TM) */
bool
mir_single_use(compiler_context *ctx, unsigned value)
{
unsigned used_count = 0;
mir_foreach_instr_global(ctx, ins) {
if (mir_has_arg(ins, value))
++used_count;
/* Short circuit for speed */
if (used_count > 1)
return false;
}
return used_count <= 1;
}
bool
mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
{
/* abs or neg */
if (!is_int && src.mod) return true;
/* Other int mods don't matter in isolation */
if (is_int && src.mod == midgard_int_shift) return true;
/* size-conversion */
if (src.half) return true;
/* swizzle */
for (unsigned c = 0; c < 4; ++c) {
if (!(mask & (1 << c))) continue;
if (((src.swizzle >> (2*c)) & 3) != c) return true;
}
return false;
}
bool
mir_nontrivial_source2_mod(midgard_instruction *ins)
{
bool is_int = midgard_is_integer_op(ins->alu.op);
midgard_vector_alu_src src2 =
vector_alu_from_unsigned(ins->alu.src2);
return mir_nontrivial_mod(src2, is_int, ins->mask);
}
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