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mesa/src/asahi/compiler/agx_pack.c
Alyssa Rosenzweig 2028e7b88b agx: Tease apart some sample_mask packing magic 
There's a second instruction here, and a second source in the first instruction.
applegpu has known about the encodings for a while but I never updated the
packing code. We will need to stop hardcoding this for multisampling support, as
preparation tease apart the magic pieces.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22353>
2023-04-07 03:23:04 +00:00

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/*
* Copyright 2021 Alyssa Rosenzweig
* SPDX-License-Identifier: MIT
*/
#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;
};
static void
assert_register_is_aligned(agx_index reg)
{
assert(reg.type == AGX_INDEX_REGISTER);
switch (reg.size) {
case AGX_SIZE_16:
return;
case AGX_SIZE_32:
assert((reg.value & 1) == 0 && "unaligned reg");
return;
case AGX_SIZE_64:
assert((reg.value & 3) == 0 && "unaligned reg");
return;
}
unreachable("Invalid register size");
}
/* 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)
{
if (index.type == AGX_INDEX_REGISTER) {
assert(index.size == AGX_SIZE_16);
*flag = 1;
} else {
assert(index.type == AGX_INDEX_IMMEDIATE);
*flag = 0;
}
return index.value;
}
static unsigned
agx_pack_sampler(agx_index index, bool *flag)
{
if (index.type == AGX_INDEX_REGISTER) {
assert(index.size == AGX_SIZE_16);
*flag = 1;
} else {
assert(index.type == AGX_INDEX_IMMEDIATE);
*flag = 0;
}
return index.value;
}
static unsigned
agx_pack_sample_compare_offset(agx_index index)
{
if (index.type == AGX_INDEX_NULL)
return 0;
assert(index.size == AGX_SIZE_32);
assert(index.value < 0x100);
assert_register_is_aligned(index);
return index.value;
}
static unsigned
agx_pack_lod(agx_index index, unsigned *lod_mode)
{
/* For automatic LOD, the LOD field is unused. Assert as much. */
if ((*lod_mode) == AGX_LOD_MODE_AUTO_LOD) {
assert(index.type == AGX_INDEX_IMMEDIATE);
assert(index.value == 0);
return 0;
}
if (index.type == AGX_INDEX_UNIFORM) {
/* Translate LOD mode from register mode to uniform mode */
assert(((*lod_mode) & BITFIELD_BIT(2)) && "must start as reg mode");
*lod_mode = (*lod_mode) & ~BITFIELD_BIT(2);
assert(index.value < 0x200);
} else {
/* Otherwise must be registers */
assert(index.type == AGX_INDEX_REGISTER);
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_register_is_aligned(index);
*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);
/* Can't seem to access high uniforms from memory instructions */
assert(index.value < 0x100);
if (index.type == AGX_INDEX_UNIFORM) {
*flag = 1;
} else {
assert(index.type == AGX_INDEX_REGISTER);
*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.size == AGX_SIZE_32);
assert((index.value & 1) == 0);
assert(index.value < 0x100);
*flag = 0;
return index.value;
}
}
static uint16_t
agx_pack_local_base(agx_index index, unsigned *flags)
{
assert(index.size == AGX_SIZE_16);
if (index.type == AGX_INDEX_IMMEDIATE) {
assert(index.value == 0);
*flags = 2;
return 0;
} else if (index.type == AGX_INDEX_UNIFORM) {
*flags = 1 | ((index.value >> 8) << 1);
return index.value & BITFIELD_MASK(7);
} else {
assert_register_is_aligned(index);
*flags = 0;
return index.value;
}
}
static uint16_t
agx_pack_local_index(agx_index index, bool *flag)
{
assert(index.size == AGX_SIZE_16);
if (index.type == AGX_INDEX_IMMEDIATE) {
assert(index.value < 0x10000);
*flag = 1;
return index.value;
} else {
assert_register_is_aligned(index);
*flag = 0;
return index.value;
}
}
static unsigned
agx_pack_atomic_source(agx_index index)
{
assert(index.size == AGX_SIZE_32 && "no 64-bit atomics yet");
assert_register_is_aligned(index);
return index.value;
}
static unsigned
agx_pack_atomic_dest(agx_index index, bool *flag)
{
assert(index.size == AGX_SIZE_32 && "no 64-bit atomics yet");
/* Atomic destinstions are optional (e.g. for update with no return) */
if (index.type == AGX_INDEX_NULL) {
*flag = 0;
return 0;
}
/* But are otherwise registers */
assert_register_is_aligned(index);
*flag = 1;
return index.value;
}
/* ALU goes through a common path */
static unsigned
agx_pack_alu_dst(agx_index dest)
{
assert_register_is_aligned(dest);
unsigned reg = dest.value;
enum agx_size size = dest.size;
assert(reg < 0x100);
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 < AGX_NUM_UNIFORMS);
return (value & BITFIELD_MASK(6)) |
((value & BITFIELD_BIT(8)) ? (1 << 6) : 0) |
((size == AGX_SIZE_32) ? (1 << 7) : 0) | (0x1 << 8) |
(((value >> 6) & BITFIELD_MASK(2)) << 10);
} else {
assert_register_is_aligned(src);
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);
assert_register_is_aligned(src);
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_register_is_aligned(src);
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->bfi_mask & 0x3) << 38;
raw |= (uint64_t)((I->bfi_mask >> 2) & 0x3) << 50;
raw |= (uint64_t)((I->bfi_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]);
assert(I->mask < 0x10);
assert(I->pixel_offset < 0x200);
agx_index sample_index = load ? I->src[0] : I->src[1];
assert(sample_index.type == AGX_INDEX_REGISTER ||
sample_index.type == AGX_INDEX_IMMEDIATE);
assert(sample_index.size == AGX_SIZE_16);
unsigned St = (sample_index.type == AGX_INDEX_REGISTER) ? 1 : 0;
unsigned S = sample_index.value;
assert(S < 0x100);
uint64_t raw = agx_opcodes_info[I->op].encoding.exact |
((uint64_t)(D & BITFIELD_MASK(8)) << 7) | (St << 22) |
((uint64_t)(I->format) << 24) |
((uint64_t)(I->pixel_offset & BITFIELD_MASK(7)) << 28) |
(load ? (1ull << 35) : 0) | ((uint64_t)(I->mask) << 36) |
((uint64_t)(I->pixel_offset >> 7) << 40) |
((uint64_t)(S & BITFIELD_MASK(6)) << 42) |
((uint64_t)(S >> 6) << 56) | (((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]);
unsigned T = 0xFF;
bool Tt = true /* immediate */;
uint32_t raw = 0xc1 | (Tt ? BITFIELD_BIT(8) : 0) |
((T & BITFIELD_MASK(6)) << 9) | ((S & 0xff) << 16) |
((T >> 6) << 24) | ((S >> 8) << 26);
unsigned size = 4;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
{
/* This is actually a separate instruction.
*
* signal_pix 1, 0
*
* We don't model this correctly yet, but we should.
*/
uint32_t raw = 0x158;
unsigned size = 4;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
}
break;
}
case AGX_OPCODE_WAIT: {
uint64_t raw =
agx_opcodes_info[I->op].encoding.exact | (I->scoreboard << 8);
unsigned size = 2;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_ITER:
case AGX_OPCODE_LDCF: {
bool flat = (I->op == AGX_OPCODE_LDCF);
unsigned D = agx_pack_alu_dst(I->dest[0]);
unsigned channels = (I->channels & 0x3);
assert(I->mask < 0xF); /* 0 indicates full mask */
agx_index src_I = I->src[0];
assert(src_I.type == AGX_INDEX_IMMEDIATE);
assert(!(flat && I->perspective));
unsigned cf_I = src_I.value;
unsigned cf_J = 0;
if (I->perspective) {
agx_index src_J = I->src[1];
assert(src_J.type == AGX_INDEX_IMMEDIATE);
cf_J = src_J.value;
}
assert(cf_I < 0x100);
assert(cf_J < 0x100);
bool kill = false; // TODO: optimize
uint64_t raw =
0x21 | (flat ? (1 << 7) : 0) | (I->perspective ? (1 << 6) : 0) |
((D & 0xFF) << 7) | (1ull << 15) | /* XXX */
((cf_I & BITFIELD_MASK(6)) << 16) | ((cf_J & BITFIELD_MASK(6)) << 24) |
(((uint64_t)channels) << 30) | (!flat ? (1ull << 46) : 0) | /* XXX */
(kill ? (1ull << 52) : 0) | /* XXX */
(((uint64_t)(D >> 8)) << 56) | ((uint64_t)(cf_I >> 6) << 58) |
((uint64_t)(cf_J >> 6) << 60);
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(index_src.value < BITFIELD_MASK(8));
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 & 0x3F)) << 16) | (0x80 << 16) | /* XXX */
((value.value >> 6) << 24) | ((index_src.value >> 6) << 26) |
(0x8u << 28); /* XXX */
unsigned size = 4;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_DEVICE_LOAD:
case AGX_OPCODE_DEVICE_STORE:
case AGX_OPCODE_UNIFORM_STORE: {
bool is_device_store = I->op == AGX_OPCODE_DEVICE_STORE;
bool is_uniform_store = I->op == AGX_OPCODE_UNIFORM_STORE;
bool is_store = is_device_store || is_uniform_store;
bool has_base = !is_uniform_store;
/* Uniform stores internally packed as 16-bit. Fix up the format, mask,
* and size so we can use scalar 32-bit values in the IR and avoid
* special casing earlier in the compiler.
*/
enum agx_format format = is_uniform_store ? AGX_FORMAT_I16 : I->format;
agx_index reg = is_store ? I->src[0] : I->dest[0];
unsigned mask = I->mask;
if (is_uniform_store) {
mask = BITFIELD_MASK(agx_size_align_16(reg.size));
reg.size = AGX_SIZE_16;
}
unsigned offset_src = (has_base ? 1 : 0) + (is_store ? 1 : 0);
bool Rt, At = false, Ot;
unsigned R = agx_pack_memory_reg(reg, &Rt);
unsigned A =
has_base ? agx_pack_memory_base(I->src[is_store ? 1 : 0], &At) : 0;
unsigned O = agx_pack_memory_index(I->src[offset_src], &Ot);
unsigned u1 = is_uniform_store ? 0 : 1; // XXX
unsigned u3 = 0;
unsigned u4 = is_uniform_store ? 0 : 4; // XXX
unsigned u5 = 0;
bool L = true; /* TODO: when would you want short? */
assert(mask != 0);
assert(format <= 0x10);
uint64_t raw =
agx_opcodes_info[I->op].encoding.exact |
((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[offset_src].abs ? (1 << 25) : 0) |
(is_uniform_store ? (2 << 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)(format >> 3)) << 48) |
(((uint64_t)Rt) << 49) | (((uint64_t)u5) << 50) |
(((uint64_t)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_LOCAL_LOAD:
case AGX_OPCODE_LOCAL_STORE: {
bool is_load = I->op == AGX_OPCODE_LOCAL_LOAD;
bool L = true; /* TODO: when would you want short? */
unsigned At;
bool Rt, Ot;
unsigned R = agx_pack_memory_reg(is_load ? I->dest[0] : I->src[0], &Rt);
unsigned A = agx_pack_local_base(is_load ? I->src[0] : I->src[1], &At);
unsigned O = agx_pack_local_index(is_load ? I->src[1] : I->src[2], &Ot);
uint64_t raw =
agx_opcodes_info[I->op].encoding.exact | (Rt ? BITFIELD64_BIT(8) : 0) |
((R & BITFIELD_MASK(6)) << 9) | (L ? BITFIELD64_BIT(15) : 0) |
((A & BITFIELD_MASK(6)) << 16) | (At << 22) | (I->format << 24) |
((O & BITFIELD64_MASK(6)) << 28) | (Ot ? BITFIELD64_BIT(34) : 0) |
(((uint64_t)I->mask) << 36) | (((uint64_t)(O >> 6)) << 48) |
(((uint64_t)(A >> 6)) << 58) | (((uint64_t)(R >> 6)) << 60);
unsigned size = L ? 8 : 6;
memcpy(util_dynarray_grow_bytes(emission, 1, size), &raw, size);
break;
}
case AGX_OPCODE_ATOMIC: {
bool At, Ot, Rt;
unsigned A = agx_pack_memory_base(I->src[1], &At);
unsigned O = agx_pack_memory_index(I->src[2], &Ot);
unsigned R = agx_pack_atomic_dest(I->dest[0], &Rt);
unsigned S = agx_pack_atomic_source(I->src[0]);
uint64_t raw =
agx_opcodes_info[I->op].encoding.exact |
(((uint64_t)I->atomic_opc) << 6) | ((R & BITFIELD_MASK(6)) << 10) |
((A & BITFIELD_MASK(4)) << 16) | ((O & BITFIELD_MASK(4)) << 20) |
(Ot ? (1 << 24) : 0) | (I->src[2].abs ? (1 << 25) : 0) | (At << 27) |
(I->scoreboard << 30) |
(((uint64_t)((O >> 4) & BITFIELD_MASK(4))) << 32) |
(((uint64_t)((A >> 4) & BITFIELD_MASK(4))) << 36) |
(((uint64_t)(R >> 6)) << 40) | (Rt ? BITFIELD64_BIT(47) : 0) |
(((uint64_t)S) << 48) | (((uint64_t)(O >> 8)) << 56);
memcpy(util_dynarray_grow_bytes(emission, 1, 8), &raw, 8);
break;
}
case AGX_OPCODE_LOCAL_ATOMIC: {
bool L = true; /* TODO: Don't force */
unsigned At;
bool Rt = false, Ot;
bool Ra = I->dest[0].type != AGX_INDEX_NULL;
unsigned R = Ra ? agx_pack_memory_reg(I->dest[0], &Rt) : 0;
unsigned S = agx_pack_atomic_source(I->src[0]);
unsigned A = agx_pack_local_base(I->src[1], &At);
unsigned O = agx_pack_local_index(I->src[2], &Ot);
uint64_t raw =
agx_opcodes_info[I->op].encoding.exact | (Rt ? BITFIELD64_BIT(8) : 0) |
((R & BITFIELD_MASK(6)) << 9) | (L ? BITFIELD64_BIT(15) : 0) |
((A & BITFIELD_MASK(6)) << 16) | (At << 22) |
(((uint64_t)I->atomic_opc) << 24) | ((O & BITFIELD64_MASK(6)) << 28) |
(Ot ? BITFIELD64_BIT(34) : 0) | (Ra ? BITFIELD64_BIT(38) : 0) |
(((uint64_t)(O >> 6)) << 48) | (((uint64_t)(A >> 6)) << 58) |
(((uint64_t)(R >> 6)) << 60);
uint64_t raw2 = S;
memcpy(util_dynarray_grow_bytes(emission, 1, 8), &raw, 8);
memcpy(util_dynarray_grow_bytes(emission, 1, 2), &raw2, 2);
break;
}
case AGX_OPCODE_TEXTURE_LOAD:
case AGX_OPCODE_TEXTURE_SAMPLE: {
assert(I->mask != 0);
assert(I->format <= 0x10);
bool Rt, Ct, St;
unsigned Tt;
enum agx_lod_mode lod_mode = I->lod_mode;
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_compare_offset(I->src[4]);
unsigned D = agx_pack_lod(I->src[1], &lod_mode);
unsigned U = 0; // TODO: what is sampler ureg?
unsigned q1 = I->shadow;
unsigned q2 = 0; // XXX
unsigned q3 = 12; // XXX
unsigned kill = 0; // helper invocation kill bit
uint32_t extend = ((U & BITFIELD_MASK(5)) << 0) | (kill << 5) |
((I->dim >> 3) << 7) | ((R >> 6) << 8) |
((C >> 6) << 10) | ((D >> 6) << 12) | ((T >> 6) << 14) |
((O & BITFIELD_MASK(6)) << 16) | (I->gather << 23) |
(I->offset << 27) | ((S >> 6) << 28) | ((O >> 6) << 30);
bool L = (extend != 0);
uint64_t raw =
0x31 | ((I->op == AGX_OPCODE_TEXTURE_LOAD) ? (1 << 6) : 0) |
(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 & BITFIELD_MASK(3))) << 40) |
(((uint64_t)q3) << 43) | (((uint64_t)I->mask) << 48) |
(((uint64_t)lod_mode) << 52) |
(((uint64_t)(S & BITFIELD_MASK(6))) << 56) | (((uint64_t)St) << 62) |
(((uint64_t)I->scoreboard) << 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_BLOCK_IMAGE_STORE: {
enum agx_format F = I->format;
assert(F < 0x10);
unsigned Tt = 0;
assert(Tt < 0x4);
unsigned T = agx_pack_texture(I->src[0], &Tt);
assert(T < 0x100);
agx_index offset = I->src[1];
assert(offset.type == AGX_INDEX_REGISTER);
assert(offset.size == AGX_SIZE_16);
unsigned R = offset.value;
assert(I->dim == AGX_DIM_2D || I->dim == AGX_DIM_2D_MS);
bool msaa = (I->dim == AGX_DIM_2D_MS);
bool unk1 = true;
unsigned unk2 = msaa ? 38 : 37; /* XXX */
unsigned unk3 = 1;
uint32_t word0 = agx_opcodes_info[I->op].encoding.exact |
(1 << 15) /* we always set length bit for now */ |
((F & 1) << 8) | ((R & BITFIELD_MASK(6)) << 9) |
(unk1 ? (1u << 31) : 0);
uint32_t word1 =
(T & BITFIELD_MASK(6)) | (Tt << 2) | (unk2 << 9) | ((R >> 6) << 24);
uint32_t word2 = (F >> 1) | (unk3 ? (1 << 3) : 0) | ((T >> 6) << 14);
memcpy(util_dynarray_grow_bytes(emission, 1, 4), &word0, 4);
memcpy(util_dynarray_grow_bytes(emission, 1, 4), &word1, 4);
memcpy(util_dynarray_grow_bytes(emission, 1, 2), &word2, 2);
break;
}
case AGX_OPCODE_ZS_EMIT: {
agx_index S = I->src[0];
if (S.type == AGX_INDEX_IMMEDIATE)
assert(S.value < BITFIELD_BIT(8));
else
assert_register_is_aligned(S);
agx_index T = I->src[1];
assert_register_is_aligned(T);
assert(I->zs >= 1 && I->zs <= 3);
uint32_t word0 = agx_opcodes_info[I->op].encoding.exact |
((S.type == AGX_INDEX_IMMEDIATE) ? (1 << 8) : 0) |
((S.value & BITFIELD_MASK(6)) << 9) |
((T.value & BITFIELD_MASK(6)) << 16) |
((T.value >> 6) << 26) | ((S.value >> 6) << 24) |
(I->zs << 29);
memcpy(util_dynarray_grow_bytes(emission, 1, 4), &word0, 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_instr_global_safe(ctx, I) {
if (I->op == AGX_OPCODE_LOGICAL_END)
agx_remove_instruction(I);
}
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);
/* Dougall calls the instruction in this footer "trap". Match the blob. */
for (unsigned i = 0; i < 8; ++i) {
uint16_t trap = agx_opcodes_info[AGX_OPCODE_TRAP].encoding.exact;
util_dynarray_append(emission, uint16_t, trap);
}
util_dynarray_fini(&fixups);
}
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