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/*
* Copyright (C) 2020 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.
*
* Authors (Collabora):
* Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
*/
#include "compiler.h"
/* Does an instruction respect outmods and source mods? Depend
* on the types involved */
bool
bi_has_outmod(bi_instruction *ins)
{
bool classy = bi_class_props[ins->type] & BI_MODS;
bool floaty = nir_alu_type_get_base_type(ins->dest_type) == nir_type_float;
return classy && floaty;
}
/* Have to check source for e.g. compares */
bool
bi_has_source_mods(bi_instruction *ins)
{
bool classy = bi_class_props[ins->type] & BI_MODS;
bool floaty = nir_alu_type_get_base_type(ins->src_types[0]) == nir_type_float;
return classy && floaty;
}
/* A source is swizzled if the op is swizzlable, in 8-bit or
* 16-bit mode, and the swizzled op. TODO: multi args */
bool
bi_is_src_swizzled(bi_instruction *ins, unsigned s)
{
bool classy = bi_class_props[ins->type] & BI_SWIZZLABLE;
bool small = nir_alu_type_get_type_size(ins->dest_type) < 32;
bool first = (s == 0); /* TODO: prop? */
return classy && small && first;
}
bool
bi_has_arg(bi_instruction *ins, unsigned arg)
{
if (!ins)
return false;
bi_foreach_src(ins, s) {
if (ins->src[s] == arg)
return true;
}
return false;
}
uint16_t
bi_from_bytemask(uint16_t bytemask, unsigned bytes)
{
unsigned value = 0;
for (unsigned c = 0, d = 0; c < 16; c += bytes, ++d) {
bool a = (bytemask & (1 << c)) != 0;
for (unsigned q = c; q < bytes; ++q)
assert(((bytemask & (1 << q)) != 0) == a);
value |= (a << d);
}
return value;
}
unsigned
bi_get_component_count(bi_instruction *ins, signed src)
{
/* Discards and branches are oddball since they're not BI_VECTOR but no
* destination. So special case.. */
if (ins->type == BI_DISCARD || ins->type == BI_BRANCH)
return 1;
if (bi_class_props[ins->type] & BI_VECTOR) {
assert(ins->vector_channels);
return (src <= 0) ? ins->vector_channels : 1;
} else {
unsigned bytes = nir_alu_type_get_type_size(src < 0 ? ins->dest_type : ins->src_types[src]);
if (ins->type == BI_ATEST || ins->type == BI_SELECT)
return 1;
return MAX2(32 / bytes, 1);
}
}
uint16_t
bi_bytemask_of_read_components(bi_instruction *ins, unsigned node)
{
uint16_t mask = 0x0;
bi_foreach_src(ins, s) {
if (ins->src[s] != node) continue;
unsigned component_count = bi_get_component_count(ins, s);
nir_alu_type T = ins->src_types[s];
unsigned size = nir_alu_type_get_type_size(T);
unsigned bytes = size / 8;
unsigned cmask = (1 << bytes) - 1;
for (unsigned i = 0; i < component_count; ++i) {
unsigned c = ins->swizzle[s][i];
mask |= (cmask << (c * bytes));
}
}
return mask;
}
uint64_t
bi_get_immediate(bi_instruction *ins, unsigned index)
{
unsigned v = ins->src[index];
assert(v & BIR_INDEX_CONSTANT);
unsigned shift = v & ~BIR_INDEX_CONSTANT;
uint64_t shifted = ins->constant.u64 >> shift;
/* Mask off the accessed part */
unsigned sz = nir_alu_type_get_type_size(ins->src_types[index]);
if (sz == 64)
return shifted;
else
return shifted & ((1ull << sz) - 1);
}
bool
bi_writes_component(bi_instruction *ins, unsigned comp)
{
return comp < bi_get_component_count(ins, -1);
}
unsigned
bi_writemask(bi_instruction *ins)
{
nir_alu_type T = ins->dest_type;
unsigned size = nir_alu_type_get_type_size(T);
unsigned bytes_per_comp = size / 8;
unsigned components = bi_get_component_count(ins, -1);
unsigned bytes = bytes_per_comp * components;
unsigned mask = (1 << bytes) - 1;
unsigned shift = ins->dest_offset * 4; /* 32-bit words */
return (mask << shift);
}
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