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mesa/src/intel/compiler/brw_ir_fs.h

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/* -*- c++ -*- */
/*
* Copyright © 2010-2015 Intel Corporation
*
* 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.
*/
#ifndef BRW_IR_FS_H
#define BRW_IR_FS_H
#include "brw_shader.h"
class fs_inst;
class fs_reg : public backend_reg {
public:
DECLARE_RALLOC_CXX_OPERATORS(fs_reg)
void init();
fs_reg();
fs_reg(struct ::brw_reg reg);
fs_reg(enum brw_reg_file file, int nr);
fs_reg(enum brw_reg_file file, int nr, enum brw_reg_type type);
bool equals(const fs_reg &r) const;
bool negative_equals(const fs_reg &r) const;
bool is_contiguous() const;
/**
* Return the size in bytes of a single logical component of the
* register assuming the given execution width.
*/
unsigned component_size(unsigned width) const;
/** Register region horizontal stride */
uint8_t stride;
};
static inline fs_reg
negate(fs_reg reg)
{
assert(reg.file != IMM);
reg.negate = !reg.negate;
return reg;
}
static inline fs_reg
retype(fs_reg reg, enum brw_reg_type type)
{
reg.type = type;
return reg;
}
static inline fs_reg
byte_offset(fs_reg reg, unsigned delta)
{
switch (reg.file) {
case BAD_FILE:
break;
case VGRF:
case ATTR:
case UNIFORM:
reg.offset += delta;
break;
case MRF: {
const unsigned suboffset = reg.offset + delta;
reg.nr += suboffset / REG_SIZE;
reg.offset = suboffset % REG_SIZE;
break;
}
case ARF:
case FIXED_GRF: {
const unsigned suboffset = reg.subnr + delta;
reg.nr += suboffset / REG_SIZE;
reg.subnr = suboffset % REG_SIZE;
break;
}
case IMM:
default:
assert(delta == 0);
}
return reg;
}
static inline fs_reg
horiz_offset(const fs_reg &reg, unsigned delta)
{
switch (reg.file) {
case BAD_FILE:
case UNIFORM:
case IMM:
/* These only have a single component that is implicitly splatted. A
* horizontal offset should be a harmless no-op.
* XXX - Handle vector immediates correctly.
*/
return reg;
case VGRF:
case MRF:
case ATTR:
return byte_offset(reg, delta * reg.stride * type_sz(reg.type));
case ARF:
case FIXED_GRF:
if (reg.is_null()) {
return reg;
} else {
const unsigned stride = reg.hstride ? 1 << (reg.hstride - 1) : 0;
return byte_offset(reg, delta * stride * type_sz(reg.type));
}
}
unreachable("Invalid register file");
}
static inline fs_reg
offset(fs_reg reg, unsigned width, unsigned delta)
{
switch (reg.file) {
case BAD_FILE:
break;
case ARF:
case FIXED_GRF:
case MRF:
case VGRF:
case ATTR:
case UNIFORM:
return byte_offset(reg, delta * reg.component_size(width));
case IMM:
assert(delta == 0);
}
return reg;
}
/**
* Get the scalar channel of \p reg given by \p idx and replicate it to all
* channels of the result.
*/
static inline fs_reg
component(fs_reg reg, unsigned idx)
{
reg = horiz_offset(reg, idx);
reg.stride = 0;
return reg;
}
/**
* Return an integer identifying the discrete address space a register is
* contained in. A register is by definition fully contained in the single
* reg_space it belongs to, so two registers with different reg_space ids are
* guaranteed not to overlap. Most register files are a single reg_space of
* its own, only the VGRF file is composed of multiple discrete address
* spaces, one for each VGRF allocation.
*/
static inline uint32_t
reg_space(const fs_reg &r)
{
return r.file << 16 | (r.file == VGRF ? r.nr : 0);
}
/**
* Return the base offset in bytes of a register relative to the start of its
* reg_space().
*/
static inline unsigned
reg_offset(const fs_reg &r)
{
return (r.file == VGRF || r.file == IMM ? 0 : r.nr) *
(r.file == UNIFORM ? 4 : REG_SIZE) + r.offset +
(r.file == ARF || r.file == FIXED_GRF ? r.subnr : 0);
}
/**
* Return the amount of padding in bytes left unused between individual
* components of register \p r due to a (horizontal) stride value greater than
* one, or zero if components are tightly packed in the register file.
*/
static inline unsigned
reg_padding(const fs_reg &r)
{
const unsigned stride = ((r.file != ARF && r.file != FIXED_GRF) ? r.stride :
r.hstride == 0 ? 0 :
1 << (r.hstride - 1));
return (MAX2(1, stride) - 1) * type_sz(r.type);
}
/**
* Return whether the register region starting at \p r and spanning \p dr
* bytes could potentially overlap the register region starting at \p s and
* spanning \p ds bytes.
*/
static inline bool
regions_overlap(const fs_reg &r, unsigned dr, const fs_reg &s, unsigned ds)
{
if (r.file == MRF && (r.nr & BRW_MRF_COMPR4)) {
fs_reg t = r;
t.nr &= ~BRW_MRF_COMPR4;
/* COMPR4 regions are translated by the hardware during decompression
* into two separate half-regions 4 MRFs apart from each other.
*/
return regions_overlap(t, dr / 2, s, ds) ||
regions_overlap(byte_offset(t, 4 * REG_SIZE), dr / 2, s, ds);
} else if (s.file == MRF && (s.nr & BRW_MRF_COMPR4)) {
return regions_overlap(s, ds, r, dr);
} else {
return reg_space(r) == reg_space(s) &&
!(reg_offset(r) + dr <= reg_offset(s) ||
reg_offset(s) + ds <= reg_offset(r));
}
}
/**
* Check that the register region given by r [r.offset, r.offset + dr[
* is fully contained inside the register region given by s
* [s.offset, s.offset + ds[.
*/
static inline bool
region_contained_in(const fs_reg &r, unsigned dr, const fs_reg &s, unsigned ds)
{
return reg_space(r) == reg_space(s) &&
reg_offset(r) >= reg_offset(s) &&
reg_offset(r) + dr <= reg_offset(s) + ds;
}
/**
* Return whether the given register region is n-periodic, i.e. whether the
* original region remains invariant after shifting it by \p n scalar
* channels.
*/
static inline bool
is_periodic(const fs_reg &reg, unsigned n)
{
if (reg.file == BAD_FILE || reg.is_null()) {
return true;
} else if (reg.file == IMM) {
const unsigned period = (reg.type == BRW_REGISTER_TYPE_UV ||
reg.type == BRW_REGISTER_TYPE_V ? 8 :
reg.type == BRW_REGISTER_TYPE_VF ? 4 :
1);
return n % period == 0;
} else if (reg.file == ARF || reg.file == FIXED_GRF) {
const unsigned period = (reg.hstride == 0 && reg.vstride == 0 ? 1 :
reg.vstride == 0 ? 1 << reg.width :
~0);
return n % period == 0;
} else {
return reg.stride == 0;
}
}
static inline bool
is_uniform(const fs_reg &reg)
{
return is_periodic(reg, 1);
}
/**
* Get the specified 8-component quarter of a register.
*/
static inline fs_reg
quarter(const fs_reg &reg, unsigned idx)
{
assert(idx < 4);
return horiz_offset(reg, 8 * idx);
}
/**
* Reinterpret each channel of register \p reg as a vector of values of the
* given smaller type and take the i-th subcomponent from each.
*/
static inline fs_reg
subscript(fs_reg reg, brw_reg_type type, unsigned i)
{
assert((i + 1) * type_sz(type) <= type_sz(reg.type));
if (reg.file == ARF || reg.file == FIXED_GRF) {
/* The stride is encoded inconsistently for fixed GRF and ARF registers
* as the log2 of the actual vertical and horizontal strides.
*/
const int delta = util_logbase2(type_sz(reg.type)) -
util_logbase2(type_sz(type));
reg.hstride += (reg.hstride ? delta : 0);
reg.vstride += (reg.vstride ? delta : 0);
} else if (reg.file == IMM) {
unsigned bit_size = type_sz(type) * 8;
reg.u64 >>= i * bit_size;
reg.u64 &= BITFIELD64_MASK(bit_size);
if (bit_size <= 16)
reg.u64 |= reg.u64 << 16;
return retype(reg, type);
} else {
reg.stride *= type_sz(reg.type) / type_sz(type);
}
return byte_offset(retype(reg, type), i * type_sz(type));
}
static inline fs_reg
horiz_stride(fs_reg reg, unsigned s)
{
reg.stride *= s;
return reg;
}
static const fs_reg reg_undef;
class fs_inst : public backend_instruction {
fs_inst &operator=(const fs_inst &);
void init(enum opcode opcode, uint8_t exec_width, const fs_reg &dst,
const fs_reg *src, unsigned sources);
public:
DECLARE_RALLOC_CXX_OPERATORS(fs_inst)
fs_inst();
fs_inst(enum opcode opcode, uint8_t exec_size);
fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst);
fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
const fs_reg &src0);
fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
const fs_reg &src0, const fs_reg &src1);
fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
const fs_reg &src0, const fs_reg &src1, const fs_reg &src2);
fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
const fs_reg src[], unsigned sources);
fs_inst(const fs_inst &that);
~fs_inst();
void resize_sources(uint8_t num_sources);
bool is_send_from_grf() const;
bool is_payload(unsigned arg) const;
bool is_partial_write() const;
unsigned components_read(unsigned i) const;
unsigned size_read(int arg) const;
bool can_do_source_mods(const struct gen_device_info *devinfo) const;
bool can_do_cmod();
bool can_change_types() const;
bool has_source_and_destination_hazard() const;
unsigned implied_mrf_writes() const;
/**
* Return whether \p arg is a control source of a virtual instruction which
* shouldn't contribute to the execution type and usual regioning
* restriction calculations of arithmetic instructions.
*/
bool is_control_source(unsigned arg) const;
/**
* Return the subset of flag registers read by the instruction as a bitset
* with byte granularity.
*/
unsigned flags_read(const gen_device_info *devinfo) const;
/**
* Return the subset of flag registers updated by the instruction (either
* partially or fully) as a bitset with byte granularity.
*/
unsigned flags_written() const;
fs_reg dst;
fs_reg *src;
uint8_t sources; /**< Number of fs_reg sources. */
bool last_rt:1;
bool pi_noperspective:1; /**< Pixel interpolator noperspective flag */
tgl_swsb sched; /**< Scheduling info. */
};
/**
* Make the execution of \p inst dependent on the evaluation of a possibly
* inverted predicate.
*/
static inline fs_inst *
set_predicate_inv(enum brw_predicate pred, bool inverse,
fs_inst *inst)
{
inst->predicate = pred;
inst->predicate_inverse = inverse;
return inst;
}
/**
* Make the execution of \p inst dependent on the evaluation of a predicate.
*/
static inline fs_inst *
set_predicate(enum brw_predicate pred, fs_inst *inst)
{
return set_predicate_inv(pred, false, inst);
}
/**
* Write the result of evaluating the condition given by \p mod to a flag
* register.
*/
static inline fs_inst *
set_condmod(enum brw_conditional_mod mod, fs_inst *inst)
{
inst->conditional_mod = mod;
return inst;
}
/**
* Clamp the result of \p inst to the saturation range of its destination
* datatype.
*/
static inline fs_inst *
set_saturate(bool saturate, fs_inst *inst)
{
inst->saturate = saturate;
return inst;
}
/**
* Return the number of dataflow registers written by the instruction (either
* fully or partially) counted from 'floor(reg_offset(inst->dst) /
* register_size)'. The somewhat arbitrary register size unit is 4B for the
* UNIFORM and IMM files and 32B for all other files.
*/
inline unsigned
regs_written(const fs_inst *inst)
{
assert(inst->dst.file != UNIFORM && inst->dst.file != IMM);
return DIV_ROUND_UP(reg_offset(inst->dst) % REG_SIZE +
inst->size_written -
MIN2(inst->size_written, reg_padding(inst->dst)),
REG_SIZE);
}
/**
* Return the number of dataflow registers read by the instruction (either
* fully or partially) counted from 'floor(reg_offset(inst->src[i]) /
* register_size)'. The somewhat arbitrary register size unit is 4B for the
* UNIFORM files and 32B for all other files.
*/
inline unsigned
regs_read(const fs_inst *inst, unsigned i)
{
if (inst->src[i].file == IMM)
return 1;
const unsigned reg_size = inst->src[i].file == UNIFORM ? 4 : REG_SIZE;
return DIV_ROUND_UP(reg_offset(inst->src[i]) % reg_size +
inst->size_read(i) -
MIN2(inst->size_read(i), reg_padding(inst->src[i])),
reg_size);
}
static inline enum brw_reg_type
get_exec_type(const fs_inst *inst)
{
brw_reg_type exec_type = BRW_REGISTER_TYPE_B;
for (int i = 0; i < inst->sources; i++) {
if (inst->src[i].file != BAD_FILE &&
!inst->is_control_source(i)) {
const brw_reg_type t = get_exec_type(inst->src[i].type);
if (type_sz(t) > type_sz(exec_type))
exec_type = t;
else if (type_sz(t) == type_sz(exec_type) &&
brw_reg_type_is_floating_point(t))
exec_type = t;
}
}
if (exec_type == BRW_REGISTER_TYPE_B)
exec_type = inst->dst.type;
assert(exec_type != BRW_REGISTER_TYPE_B);
/* Promotion of the execution type to 32-bit for conversions from or to
* half-float seems to be consistent with the following text from the
* Cherryview PRM Vol. 7, "Execution Data Type":
*
* "When single precision and half precision floats are mixed between
* source operands or between source and destination operand [..] single
* precision float is the execution datatype."
*
* and from "Register Region Restrictions":
*
* "Conversion between Integer and HF (Half Float) must be DWord aligned
* and strided by a DWord on the destination."
*/
if (type_sz(exec_type) == 2 &&
inst->dst.type != exec_type) {
if (exec_type == BRW_REGISTER_TYPE_HF)
exec_type = BRW_REGISTER_TYPE_F;
else if (inst->dst.type == BRW_REGISTER_TYPE_HF)
exec_type = BRW_REGISTER_TYPE_D;
}
return exec_type;
}
static inline unsigned
get_exec_type_size(const fs_inst *inst)
{
return type_sz(get_exec_type(inst));
}
static inline bool
is_send(const fs_inst *inst)
{
return inst->mlen || inst->is_send_from_grf();
}
/**
* Return whether the instruction isn't an ALU instruction and cannot be
* assumed to complete in-order.
*/
static inline bool
is_unordered(const fs_inst *inst)
{
return is_send(inst) || inst->is_math();
}
/**
* Return whether the following regioning restriction applies to the specified
* instruction. From the Cherryview PRM Vol 7. "Register Region
* Restrictions":
*
* "When source or destination datatype is 64b or operation is integer DWord
* multiply, regioning in Align1 must follow these rules:
*
* 1. Source and Destination horizontal stride must be aligned to the same qword.
* 2. Regioning must ensure Src.Vstride = Src.Width * Src.Hstride.
* 3. Source and Destination offset must be the same, except the case of
* scalar source."
*/
static inline bool
has_dst_aligned_region_restriction(const gen_device_info *devinfo,
const fs_inst *inst,
brw_reg_type dst_type)
{
const brw_reg_type exec_type = get_exec_type(inst);
/* Even though the hardware spec claims that "integer DWord multiply"
* operations are restricted, empirical evidence and the behavior of the
* simulator suggest that only 32x32-bit integer multiplication is
* restricted.
*/
const bool is_dword_multiply = !brw_reg_type_is_floating_point(exec_type) &&
((inst->opcode == BRW_OPCODE_MUL &&
MIN2(type_sz(inst->src[0].type), type_sz(inst->src[1].type)) >= 4) ||
(inst->opcode == BRW_OPCODE_MAD &&
MIN2(type_sz(inst->src[1].type), type_sz(inst->src[2].type)) >= 4));
if (type_sz(dst_type) > 4 || type_sz(exec_type) > 4 ||
(type_sz(exec_type) == 4 && is_dword_multiply))
return devinfo->is_cherryview || gen_device_info_is_9lp(devinfo) ||
devinfo->verx10 >= 125;
else if (brw_reg_type_is_floating_point(inst->dst.type))
return devinfo->verx10 >= 125;
else
return false;
}
static inline bool
has_dst_aligned_region_restriction(const gen_device_info *devinfo,
const fs_inst *inst)
{
return has_dst_aligned_region_restriction(devinfo, inst, inst->dst.type);
}
/**
* Return whether the LOAD_PAYLOAD instruction is a plain copy of bits from
* the specified register file into a VGRF.
*
* This implies identity register regions without any source-destination
* overlap, but otherwise has no implications on the location of sources and
* destination in the register file: Gathering any number of portions from
* multiple virtual registers in any order is allowed.
*/
inline bool
is_copy_payload(brw_reg_file file, const fs_inst *inst)
{
if (inst->opcode != SHADER_OPCODE_LOAD_PAYLOAD ||
inst->is_partial_write() || inst->saturate ||
inst->dst.file != VGRF)
return false;
for (unsigned i = 0; i < inst->sources; i++) {
if (inst->src[i].file != file ||
inst->src[i].abs || inst->src[i].negate)
return false;
if (!inst->src[i].is_contiguous())
return false;
if (regions_overlap(inst->dst, inst->size_written,
inst->src[i], inst->size_read(i)))
return false;
}
return true;
}
/**
* Like is_copy_payload(), but the instruction is required to copy a single
* contiguous block of registers from the given register file into the
* destination without any reordering.
*/
inline bool
is_identity_payload(brw_reg_file file, const fs_inst *inst) {
if (is_copy_payload(file, inst)) {
fs_reg reg = inst->src[0];
for (unsigned i = 0; i < inst->sources; i++) {
reg.type = inst->src[i].type;
if (!inst->src[i].equals(reg))
return false;
reg = byte_offset(reg, inst->size_read(i));
}
return true;
} else {
return false;
}
}
/**
* Like is_copy_payload(), but the instruction is required to source data from
* at least two disjoint VGRFs.
*
* This doesn't necessarily rule out the elimination of this instruction
* through register coalescing, but due to limitations of the register
* coalesce pass it might be impossible to do so directly until a later stage,
* when the LOAD_PAYLOAD instruction is unrolled into a sequence of MOV
* instructions.
*/
inline bool
is_multi_copy_payload(const fs_inst *inst) {
if (is_copy_payload(VGRF, inst)) {
for (unsigned i = 0; i < inst->sources; i++) {
if (inst->src[i].nr != inst->src[0].nr)
return true;
}
}
return false;
}
/**
* Like is_identity_payload(), but the instruction is required to copy the
* whole contents of a single VGRF into the destination.
*
* This means that there is a good chance that the instruction will be
* eliminated through register coalescing, but it's neither a necessary nor a
* sufficient condition for that to happen -- E.g. consider the case where
* source and destination registers diverge due to other instructions in the
* program overwriting part of their contents, which isn't something we can
* predict up front based on a cheap strictly local test of the copy
* instruction.
*/
inline bool
is_coalescing_payload(const brw::simple_allocator &alloc, const fs_inst *inst)
{
return is_identity_payload(VGRF, inst) &&
inst->src[0].offset == 0 &&
alloc.sizes[inst->src[0].nr] * REG_SIZE == inst->size_written;
}
bool
has_bank_conflict(const gen_device_info *devinfo, const fs_inst *inst);
#endif
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