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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 <stdarg.h>
#include "ir3.h"
/*
* Flatten: flatten out legs of if/else, etc
*
* TODO probably should use some heuristic to decide to not flatten
* if one side of the other is too large / deeply nested / whatever?
*/
struct ir3_flatten_ctx {
struct ir3_block *block;
unsigned cnt;
};
static struct ir3_register *unwrap(struct ir3_register *reg)
{
if (reg->flags & IR3_REG_SSA) {
struct ir3_instruction *instr = reg->instr;
if (is_meta(instr)) {
switch (instr->opc) {
case OPC_META_OUTPUT:
case OPC_META_FLOW:
if (instr->regs_count > 1)
return instr->regs[1];
return NULL;
default:
break;
}
}
}
return reg;
}
static void ir3_instr_flatten(struct ir3_flatten_ctx *ctx,
struct ir3_instruction *instr)
{
unsigned i;
/* if we've already visited this instruction, bail now: */
if (ir3_instr_check_mark(instr))
return;
instr->block = ctx->block;
/* TODO: maybe some threshold to decide whether to
* flatten or not??
*/
if (is_meta(instr)) {
if (instr->opc == OPC_META_PHI) {
struct ir3_register *cond, *t, *f;
cond = unwrap(instr->regs[1]);
t = unwrap(instr->regs[2]); /* true val */
f = unwrap(instr->regs[3]); /* false val */
/* must have cond, but t or f may be null if only written
* one one side of the if/else (in which case we can just
* convert the PHI to a simple move).
*/
assert(cond);
assert(t || f);
if (t && f) {
/* convert the PHI instruction to sel.{b16,b32} */
instr->category = 3;
/* instruction type based on dst size: */
if (instr->regs[0]->flags & IR3_REG_HALF)
instr->opc = OPC_SEL_B16;
else
instr->opc = OPC_SEL_B32;
instr->regs[1] = t;
instr->regs[2] = cond;
instr->regs[3] = f;
} else {
/* convert to simple mov: */
instr->category = 1;
instr->cat1.dst_type = TYPE_F32;
instr->cat1.src_type = TYPE_F32;
instr->regs_count = 2;
instr->regs[1] = t ? t : f;
}
ctx->cnt++;
} else if ((instr->opc == OPC_META_INPUT) &&
(instr->regs_count == 2)) {
type_t ftype;
if (instr->regs[0]->flags & IR3_REG_HALF)
ftype = TYPE_F16;
else
ftype = TYPE_F32;
/* convert meta:input to mov: */
instr->category = 1;
instr->cat1.src_type = ftype;
instr->cat1.dst_type = ftype;
}
}
/* recursively visit children: */
for (i = 1; i < instr->regs_count; i++) {
struct ir3_register *src = instr->regs[i];
if (src->flags & IR3_REG_SSA)
ir3_instr_flatten(ctx, src->instr);
}
}
/* return >= 0 is # of phi's flattened, < 0 is error */
int ir3_block_flatten(struct ir3_block *block)
{
struct ir3_flatten_ctx ctx = {
.block = block,
};
unsigned i;
ir3_shader_clear_mark(block->shader);
for(i = 0; i < block->noutputs; i++)
if (block->outputs[i])
ir3_instr_flatten(&ctx, block->outputs[i]);
return ctx.cnt;
}
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