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mesa/src/asahi/compiler/agx_pack.c

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/*
* Copyright (C) 2021 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 "agx_compiler.h"
/* Binary patches needed for branch offsets */
struct agx_branch_fixup {
/* Offset into the binary to patch */
off_t offset;
/* Value to patch with will be block->offset */
agx_block *block;
};
/* Texturing has its own operands */
static unsigned
agx_pack_sample_coords(agx_index index, bool *flag)
{
/* TODO: how to encode 16-bit coords? */
assert(index.size == AGX_SIZE_32);
assert(index.value < 0x100);
*flag = index.discard;
return index.value;
}
static unsigned
agx_pack_texture(agx_index index, unsigned *flag)
{
/* TODO: indirection */
assert(index.type == AGX_INDEX_IMMEDIATE);
*flag = 0;
return index.value;
}
static unsigned
agx_pack_sampler(agx_index index, bool *flag)
{
/* TODO: indirection */
assert(index.type == AGX_INDEX_IMMEDIATE);
*flag = 0;
return index.value;
}
static unsigned
agx_pack_sample_offset(agx_index index, bool *flag)
{
/* TODO: offsets */
assert(index.type == AGX_INDEX_NULL);
*flag = 0;
return 0;
}
static unsigned
agx_pack_lod(agx_index index)
{
/* Immediate zero */
if (index.type == AGX_INDEX_IMMEDIATE && index.value == 0)
return 0;
/* Otherwise must be a 16-bit float immediate */
assert(index.type == AGX_INDEX_REGISTER);
assert(index.size == AGX_SIZE_16);
assert(index.value < 0x100);
return index.value;
}
/* Load/stores have their own operands */
static unsigned
agx_pack_memory_reg(agx_index index, bool *flag)
{
assert(index.size == AGX_SIZE_16 || index.size == AGX_SIZE_32);
assert(index.size == AGX_SIZE_16 || (index.value & 1) == 0);
assert(index.value < 0x100);
*flag = (index.size == AGX_SIZE_32);
return index.value;
}
static unsigned
agx_pack_memory_base(agx_index index, bool *flag)
{
assert(index.size == AGX_SIZE_64);
assert((index.value & 1) == 0);
if (index.type == AGX_INDEX_UNIFORM) {
assert(index.value < 0x200);
*flag = 1;
return index.value;
} else {
assert(index.value < 0x100);
*flag = 0;
return index.value;
}
}
static unsigned
agx_pack_memory_index(agx_index index, bool *flag)
{
if (index.type == AGX_INDEX_IMMEDIATE) {
assert(index.value < 0x10000);
*flag = 1;
return index.value;
} else {
assert(index.type == AGX_INDEX_REGISTER);
assert((index.value & 1) == 0);
assert(index.value < 0x100);
*flag = 0;
return index.value;
}
}
/* ALU goes through a common path */
static unsigned
agx_pack_alu_dst(agx_index dest)
{
assert(dest.type == AGX_INDEX_REGISTER);
unsigned reg = dest.value;
enum agx_size size = dest.size;
assert(reg < 0x100);
/* RA invariant: alignment of half-reg */
if (size >= AGX_SIZE_32)
assert((reg & 1) == 0);
return
(dest.cache ? (1 << 0) : 0) |
((size >= AGX_SIZE_32) ? (1 << 1) : 0) |
((size == AGX_SIZE_64) ? (1 << 2) : 0) |
((reg << 2));
}
static unsigned
agx_pack_alu_src(agx_index src)
{
unsigned value = src.value;
enum agx_size size = src.size;
if (src.type == AGX_INDEX_IMMEDIATE) {
/* Flags 0 for an 8-bit immediate */
assert(value < 0x100);
return
(value & BITFIELD_MASK(6)) |
((value >> 6) << 10);
} else if (src.type == AGX_INDEX_UNIFORM) {
assert(size == AGX_SIZE_16 || size == AGX_SIZE_32);
assert(value < 0x200);
return
(value & BITFIELD_MASK(6)) |
((value >> 8) << 6) |
((size == AGX_SIZE_32) ? (1 << 7) : 0) |
(0x1 << 8) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
} else {
assert(src.type == AGX_INDEX_REGISTER);
assert(!(src.cache && src.discard));
unsigned hint = src.discard ? 0x3 : src.cache ? 0x2 : 0x1;
unsigned size_flag =
(size == AGX_SIZE_64) ? 0x3 :
(size == AGX_SIZE_32) ? 0x2 :
(size == AGX_SIZE_16) ? 0x0 : 0x0;
return
(value & BITFIELD_MASK(6)) |
(hint << 6) |
(size_flag << 8) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
}
}
static unsigned
agx_pack_cmpsel_src(agx_index src, enum agx_size dest_size)
{
unsigned value = src.value;
ASSERTED enum agx_size size = src.size;
if (src.type == AGX_INDEX_IMMEDIATE) {
/* Flags 0x4 for an 8-bit immediate */
assert(value < 0x100);
return
(value & BITFIELD_MASK(6)) |
(0x4 << 6) |
((value >> 6) << 10);
} else if (src.type == AGX_INDEX_UNIFORM) {
assert(size == AGX_SIZE_16 || size == AGX_SIZE_32);
assert(size == dest_size);
assert(value < 0x200);
return
(value & BITFIELD_MASK(6)) |
((value >> 8) << 6) |
(0x3 << 7) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
} else {
assert(src.type == AGX_INDEX_REGISTER);
assert(!(src.cache && src.discard));
assert(size == AGX_SIZE_16 || size == AGX_SIZE_32);
assert(size == dest_size);
unsigned hint = src.discard ? 0x3 : src.cache ? 0x2 : 0x1;
return
(value & BITFIELD_MASK(6)) |
(hint << 6) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
}
}
static unsigned
agx_pack_sample_mask_src(agx_index src)
{
unsigned value = src.value;
unsigned packed_value =
(value & BITFIELD_MASK(6)) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
if (src.type == AGX_INDEX_IMMEDIATE) {
assert(value < 0x100);
return packed_value | (1 << 7);
} else {
assert(src.type == AGX_INDEX_REGISTER);
assert(!(src.cache && src.discard));
return packed_value;
}
}
static unsigned
agx_pack_float_mod(agx_index src)
{
return (src.abs ? (1 << 0) : 0)
| (src.neg ? (1 << 1) : 0);
}
static bool
agx_all_16(agx_instr *I)
{
agx_foreach_dest(I, d) {
if (!agx_is_null(I->dest[d]) && I->dest[d].size != AGX_SIZE_16)
return false;
}
agx_foreach_src(I, s) {
if (!agx_is_null(I->src[s]) && I->src[s].size != AGX_SIZE_16)
return false;
}
return true;
}
/* Generic pack for ALU instructions, which are quite regular */
static void
agx_pack_alu(struct util_dynarray *emission, agx_instr *I)
{
struct agx_opcode_info info = agx_opcodes_info[I->op];
bool is_16 = agx_all_16(I) && info.encoding_16.exact;
struct agx_encoding encoding = is_16 ?
info.encoding_16 : info.encoding;
assert(encoding.exact && "invalid encoding");
uint64_t raw = encoding.exact;
uint16_t extend = 0;
// TODO: assert saturable
if (I->saturate)
raw |= (1 << 6);
if (info.nr_dests) {
assert(info.nr_dests == 1);
unsigned D = agx_pack_alu_dst(I->dest[0]);
unsigned extend_offset = (sizeof(extend)*8) - 4;
raw |= (D & BITFIELD_MASK(8)) << 7;
extend |= ((D >> 8) << extend_offset);
} else if (info.immediates & AGX_IMMEDIATE_NEST) {
raw |= (I->invert_cond << 8);
raw |= (I->nest << 11);
raw |= (I->icond << 13);
}
for (unsigned s = 0; s < info.nr_srcs; ++s) {
bool is_cmpsel = (s >= 2) &&
(I->op == AGX_OPCODE_ICMPSEL || I->op == AGX_OPCODE_FCMPSEL);
unsigned src = is_cmpsel ?
agx_pack_cmpsel_src(I->src[s], I->dest[0].size) :
agx_pack_alu_src(I->src[s]);
unsigned src_short = (src & BITFIELD_MASK(10));
unsigned src_extend = (src >> 10);
/* Size bit always zero and so omitted for 16-bit */
if (is_16 && !is_cmpsel)
assert((src_short & (1 << 9)) == 0);
if (info.is_float) {
unsigned fmod = agx_pack_float_mod(I->src[s]);
unsigned fmod_offset = is_16 ? 9 : 10;
src_short |= (fmod << fmod_offset);
} else if (I->op == AGX_OPCODE_IMAD || I->op == AGX_OPCODE_IADD) {
bool zext = I->src[s].abs;
bool extends = I->src[s].size < AGX_SIZE_64;
unsigned sxt = (extends && !zext) ? (1 << 10) : 0;
assert(!I->src[s].neg || s == 1);
src_short |= sxt;
}
/* Sources come at predictable offsets */
unsigned offset = 16 + (12 * s);
raw |= (((uint64_t) src_short) << offset);
/* Destination and each source get extended in reverse order */
unsigned extend_offset = (sizeof(extend)*8) - ((s + 3) * 2);
extend |= (src_extend << extend_offset);
}
if ((I->op == AGX_OPCODE_IMAD || I->op == AGX_OPCODE_IADD) && I->src[1].neg)
raw |= (1 << 27);
if (info.immediates & AGX_IMMEDIATE_TRUTH_TABLE) {
raw |= (I->truth_table & 0x3) << 26;
raw |= (uint64_t) (I->truth_table >> 2) << 38;
} else if (info.immediates & AGX_IMMEDIATE_SHIFT) {
raw |= (uint64_t) (I->shift & 1) << 39;
raw |= (uint64_t) (I->shift >> 2) << 52;
} else if (info.immediates & AGX_IMMEDIATE_BFI_MASK) {
raw |= (uint64_t) (I->mask & 0x3) << 38;
raw |= (uint64_t) ((I->mask >> 2) & 0x3) << 50;
raw |= (uint64_t) ((I->mask >> 4) & 0x1) << 63;
} else if (info.immediates & AGX_IMMEDIATE_SR) {
raw |= (uint64_t) (I->sr & 0x3F) << 16;
raw |= (uint64_t) (I->sr >> 6) << 26;
} else if (info.immediates & AGX_IMMEDIATE_WRITEOUT)
raw |= (uint64_t) (I->imm) << 8;
else if (info.immediates & AGX_IMMEDIATE_IMM)
raw |= (uint64_t) (I->imm) << 16;
else if (info.immediates & AGX_IMMEDIATE_ROUND)
raw |= (uint64_t) (I->imm) << 26;
else if (info.immediates & (AGX_IMMEDIATE_FCOND | AGX_IMMEDIATE_ICOND))
raw |= (uint64_t) (I->fcond) << 61;
/* Determine length bit */
unsigned length = encoding.length_short;
unsigned short_mask = (1 << length) - 1;
bool length_bit = (extend || (raw & ~short_mask));
if (encoding.extensible && length_bit) {
raw |= (1 << 15);
length += (length > 8) ? 4 : 2;
}
/* Pack! */
if (length <= sizeof(uint64_t)) {
unsigned extend_offset = ((length - sizeof(extend)) * 8);
/* XXX: This is a weird special case */
if (I->op == AGX_OPCODE_IADD)
extend_offset -= 16;
raw |= (uint64_t) extend << extend_offset;
memcpy(util_dynarray_grow_bytes(emission, 1, length), &raw, length);
} else {
/* So far, >8 byte ALU is only to store the extend bits */
unsigned extend_offset = (((length - sizeof(extend)) * 8) - 64);
unsigned hi = ((uint64_t) extend) << extend_offset;
memcpy(util_dynarray_grow_bytes(emission, 1, 8), &raw, 8);
memcpy(util_dynarray_grow_bytes(emission, 1, length - 8), &hi, length - 8);
}
}
static void
agx_pack_instr(struct util_dynarray *emission, struct util_dynarray *fixups, agx_instr *I)
{
switch (I->op) {
case AGX_OPCODE_LD_TILE:
case AGX_OPCODE_ST_TILE:
{
bool load = (I->op == AGX_OPCODE_LD_TILE);
unsigned D = agx_pack_alu_dst(load ? I->dest[0] : I->src[0]);
unsigned rt = 0; /* TODO */
unsigned mask = I->mask ?: 0xF;
assert(mask < 0x10);
uint64_t raw =
0x09 |
(load ? (1 << 6) : 0) |
((uint64_t) (D & BITFIELD_MASK(8)) << 7) |
((uint64_t) (I->format) << 24) |
((uint64_t) (rt) << 32) |
(load ? (1ull << 35) : 0) |
((uint64_t) (mask) << 36) |
((uint64_t) 0x0380FC << 40) |
(((uint64_t) (D >> 8)) << 60);
unsigned size = 8;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_SAMPLE_MASK:
{
unsigned S = agx_pack_sample_mask_src(I->src[0]);
uint64_t raw =
0x7fc1 |
((S & 0xff) << 16) |
(0x3 << 24) |
((S >> 8) << 26) |
(0x158ull << 32);
unsigned size = 8;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_LD_VARY:
case AGX_OPCODE_LD_VARY_FLAT:
{
bool flat = (I->op == AGX_OPCODE_LD_VARY_FLAT);
unsigned D = agx_pack_alu_dst(I->dest[0]);
unsigned channels = (I->channels & 0x3);
assert(I->mask < 0xF); /* 0 indicates full mask */
agx_index index_src = I->src[0];
assert(index_src.type == AGX_INDEX_IMMEDIATE);
assert(!(flat && I->perspective));
unsigned index = index_src.value;
bool kill = false; // TODO: optimize
uint64_t raw =
0x21 | (flat ? (1 << 7) : 0) |
(I->perspective ? (1 << 6) : 0) |
((D & 0xFF) << 7) |
(1ull << 15) | /* XXX */
(((uint64_t) index) << 16) |
(((uint64_t) channels) << 30) |
(!flat ? (1ull << 46) : 0) | /* XXX */
(kill ? (1ull << 52) : 0) | /* XXX */
(((uint64_t) (D >> 8)) << 56);
unsigned size = 8;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_ST_VARY:
{
agx_index index_src = I->src[0];
agx_index value = I->src[1];
assert(index_src.type == AGX_INDEX_IMMEDIATE);
assert(value.type == AGX_INDEX_REGISTER);
assert(value.size == AGX_SIZE_32);
uint64_t raw =
0x11 |
(I->last ? (1 << 7) : 0) |
((value.value & 0x3F) << 9) |
(((uint64_t) index_src.value) << 16) |
(0x80 << 16) | /* XXX */
((value.value >> 6) << 24) |
(0x8 << 28); /* XXX */
unsigned size = 4;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_DEVICE_LOAD:
{
assert(I->mask != 0);
assert(I->format <= 0x10);
bool Rt, At, Ot;
unsigned R = agx_pack_memory_reg(I->dest[0], &Rt);
unsigned A = agx_pack_memory_base(I->src[0], &At);
unsigned O = agx_pack_memory_index(I->src[1], &Ot);
unsigned u1 = 1; // XXX
unsigned u3 = 0;
unsigned u4 = 4; // XXX
unsigned u5 = 0;
bool L = true; /* TODO: when would you want short? */
uint64_t raw =
0x05 |
((I->format & BITFIELD_MASK(3)) << 7) |
((R & BITFIELD_MASK(6)) << 10) |
((A & BITFIELD_MASK(4)) << 16) |
((O & BITFIELD_MASK(4)) << 20) |
(Ot ? (1 << 24) : 0) |
(I->src[1].abs ? (1 << 25) : 0) |
(u1 << 26) |
(At << 27) |
(u3 << 28) |
(I->scoreboard << 30) |
(((uint64_t) ((O >> 4) & BITFIELD_MASK(4))) << 32) |
(((uint64_t) ((A >> 4) & BITFIELD_MASK(4))) << 36) |
(((uint64_t) ((R >> 6) & BITFIELD_MASK(2))) << 40) |
(((uint64_t) I->shift) << 42) |
(((uint64_t) u4) << 44) |
(L ? (1ull << 47) : 0) |
(((uint64_t) (I->format >> 3)) << 48) |
(((uint64_t) Rt) << 49) |
(((uint64_t) u5) << 50) |
(((uint64_t) I->mask) << 52) |
(((uint64_t) (O >> 8)) << 56);
unsigned size = L ? 8 : 6;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_TEXTURE_SAMPLE:
{
assert(I->mask != 0);
assert(I->format <= 0x10);
bool Rt, Ot, Ct, St;
unsigned Tt;
unsigned R = agx_pack_memory_reg(I->dest[0], &Rt);
unsigned C = agx_pack_sample_coords(I->src[0], &Ct);
unsigned T = agx_pack_texture(I->src[2], &Tt);
unsigned S = agx_pack_sampler(I->src[3], &St);
unsigned O = agx_pack_sample_offset(I->src[4], &Ot);
unsigned D = agx_pack_lod(I->src[1]);
unsigned U = 0; // TODO: what is sampler ureg?
unsigned q1 = 0; // XXX
unsigned q2 = 0; // XXX
unsigned q3 = 12; // XXX
unsigned kill = 0; // helper invocation kill bit
unsigned q5 = 0; // XXX
unsigned q6 = 0; // XXX
uint32_t extend =
((U & BITFIELD_MASK(5)) << 0) |
(kill << 5) |
((R >> 6) << 8) |
((C >> 6) << 10) |
((D >> 6) << 12) |
((T >> 6) << 14) |
((O & BITFIELD_MASK(6)) << 16) |
(q6 << 22) |
(Ot << 27) |
((S >> 6) << 28) |
((O >> 6) << 30);
bool L = (extend != 0);
assert(I->scoreboard == 0 && "todo");
uint64_t raw =
0x31 |
(Rt ? (1 << 8) : 0) |
((R & BITFIELD_MASK(6)) << 9) |
(L ? (1 << 15) : 0) |
((C & BITFIELD_MASK(6)) << 16) |
(Ct ? (1 << 22) : 0) |
(q1 << 23) |
((D & BITFIELD_MASK(6)) << 24) |
(q2 << 30) |
(((uint64_t) (T & BITFIELD_MASK(6))) << 32) |
(((uint64_t) Tt) << 38) |
(((uint64_t) I->dim) << 40) |
(((uint64_t) q3) << 43) |
(((uint64_t) I->mask) << 48) |
(((uint64_t) I->lod_mode) << 52) |
(((uint64_t) (S & BITFIELD_MASK(6))) << 32) |
(((uint64_t) St) << 62) |
(((uint64_t) q5) << 63);
memcpy(util_dynarray_grow_bytes(emission, 1, 8), &raw, 8);
if (L)
memcpy(util_dynarray_grow_bytes(emission, 1, 4), &extend, 4);
break;
}
case AGX_OPCODE_JMP_EXEC_ANY:
case AGX_OPCODE_JMP_EXEC_NONE:
{
/* We don't implement indirect branches */
assert(I->target != NULL);
/* We'll fix the offset later. */
struct agx_branch_fixup fixup = {
.block = I->target,
.offset = emission->size
};
util_dynarray_append(fixups, struct agx_branch_fixup, fixup);
/* The rest of the instruction is fixed */
struct agx_opcode_info info = agx_opcodes_info[I->op];
uint64_t raw = info.encoding.exact;
memcpy(util_dynarray_grow_bytes(emission, 1, 6), &raw, 6);
break;
}
default:
agx_pack_alu(emission, I);
return;
}
}
/* Relative branches may be emitted before their targets, so we patch the
* binary to fix up the branch offsets after the main emit */
static void
agx_fixup_branch(struct util_dynarray *emission, struct agx_branch_fixup fix)
{
/* Branch offset is 2 bytes into the jump instruction */
uint8_t *location = ((uint8_t *) emission->data) + fix.offset + 2;
/* Offsets are relative to the jump instruction */
int32_t patch = (int32_t) fix.block->offset - (int32_t) fix.offset;
/* Patch the binary */
memcpy(location, &patch, sizeof(patch));
}
void
agx_pack_binary(agx_context *ctx, struct util_dynarray *emission)
{
struct util_dynarray fixups;
util_dynarray_init(&fixups, ctx);
agx_foreach_block(ctx, block) {
/* Relative to the start of the binary, the block begins at the current
* number of bytes emitted */
block->offset = emission->size;
agx_foreach_instr_in_block(block, ins) {
agx_pack_instr(emission, &fixups, ins);
}
}
util_dynarray_foreach(&fixups, struct agx_branch_fixup, fixup)
agx_fixup_branch(emission, *fixup);
util_dynarray_fini(&fixups);
}
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