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/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
/*
* Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
*
* 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:
* Rob Clark <robclark@freedesktop.org>
*/
#include "util/u_math.h"
#include "ir3.h"
/*
* Instruction Depth:
*
* Calculates weighted instruction depth, ie. the sum of # of needed
* instructions plus delay slots back to original input (ie INPUT or
* CONST). That is to say, an instructions depth is:
*
* depth(instr) {
* d = 0;
* // for each src register:
* foreach (src in instr->regs[1..n])
* d = max(d, delayslots(src->instr, n) + depth(src->instr));
* return d + 1;
* }
*
* After an instruction's depth is calculated, it is inserted into the
* blocks depth sorted list, which is used by the scheduling pass.
*/
/* calculate required # of delay slots between the instruction that
* assigns a value and the one that consumes
*/
int ir3_delayslots(struct ir3_instruction *assigner,
struct ir3_instruction *consumer, unsigned n)
{
/* worst case is cat1-3 (alu) -> cat4/5 needing 6 cycles, normal
* alu -> alu needs 3 cycles, cat4 -> alu and texture fetch
* handled with sync bits
*/
if (is_meta(assigner))
return 0;
if (writes_addr(assigner))
return 6;
/* handled via sync flags: */
if (is_sfu(assigner) || is_tex(assigner) || is_mem(assigner))
return 0;
/* assigner must be alu: */
if (is_flow(consumer) || is_sfu(consumer) || is_tex(consumer) ||
is_mem(consumer)) {
return 6;
} else if ((consumer->category == 3) &&
(is_mad(consumer->opc) || is_madsh(consumer->opc)) &&
(n == 3)) {
/* special case, 3rd src to cat3 not required on first cycle */
return 1;
} else {
return 3;
}
}
void
ir3_insert_by_depth(struct ir3_instruction *instr, struct list_head *list)
{
/* remove from existing spot in list: */
list_delinit(&instr->node);
/* find where to re-insert instruction: */
list_for_each_entry (struct ir3_instruction, pos, list, node) {
if (pos->depth > instr->depth) {
list_add(&instr->node, &pos->node);
return;
}
}
/* if we get here, we didn't find an insertion spot: */
list_addtail(&instr->node, list);
}
static void
ir3_instr_depth(struct ir3_instruction *instr)
{
struct ir3_instruction *src;
/* if we've already visited this instruction, bail now: */
if (ir3_instr_check_mark(instr))
return;
instr->depth = 0;
foreach_ssa_src_n(src, i, instr) {
unsigned sd;
/* visit child to compute it's depth: */
ir3_instr_depth(src);
/* for array writes, no need to delay on previous write: */
if (i == 0)
continue;
sd = ir3_delayslots(src, instr, i) + src->depth;
instr->depth = MAX2(instr->depth, sd);
}
if (!is_meta(instr))
instr->depth++;
ir3_insert_by_depth(instr, &instr->block->instr_list);
}
static void
remove_unused_by_block(struct ir3_block *block)
{
list_for_each_entry_safe (struct ir3_instruction, instr, &block->instr_list, node) {
if (!ir3_instr_check_mark(instr)) {
if (is_flow(instr) && (instr->opc == OPC_END))
continue;
/* mark it, in case it is input, so we can
* remove unused inputs:
*/
instr->flags |= IR3_INSTR_UNUSED;
/* and remove from instruction list: */
list_delinit(&instr->node);
}
}
}
void
ir3_depth(struct ir3 *ir)
{
unsigned i;
ir3_clear_mark(ir);
for (i = 0; i < ir->noutputs; i++)
if (ir->outputs[i])
ir3_instr_depth(ir->outputs[i]);
for (i = 0; i < ir->keeps_count; i++)
ir3_instr_depth(ir->keeps[i]);
/* We also need to account for if-condition: */
list_for_each_entry (struct ir3_block, block, &ir->block_list, node) {
if (block->condition)
ir3_instr_depth(block->condition);
}
/* mark un-used instructions: */
list_for_each_entry (struct ir3_block, block, &ir->block_list, node) {
remove_unused_by_block(block);
}
/* note that we can end up with unused indirects, but we should
* not end up with unused predicates.
*/
for (i = 0; i < ir->indirects_count; i++) {
struct ir3_instruction *instr = ir->indirects[i];
if (instr->flags & IR3_INSTR_UNUSED)
ir->indirects[i] = NULL;
}
/* cleanup unused inputs: */
for (i = 0; i < ir->ninputs; i++) {
struct ir3_instruction *in = ir->inputs[i];
if (in && (in->flags & IR3_INSTR_UNUSED))
ir->inputs[i] = NULL;
}
}
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