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Copy pathextr.c
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175 lines (165 loc) · 6.71 KB
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#include "emulate.h"
#define EXTR_SIGNED_INPUT (1ull << 57)
#define EXTR_SIGNED_OUTPUT (1ull << 56)
#define EXTR_SATURATE (1ull << 55)
#define EXTR_ROUNDING_SHIFT (1ull << 54)
#define EXTR_BETWEEN_XY (1ull << 27)
#define EXTR_HV (1ull << 26)
#define EXTR_HV_TO_Y (1ull << 10)
static uint32_t bf16_from_f32(uint32_t f) {
if ((f & 0x7fffffff) > 0x7f800000) return BF16_NAN; // Any NaN -> Default NaN
uint32_t low = f & 0xffff;
f >>= 16;
return f + (low + (f & 1) > 0x8000);
}
static int64_t extr_alu(int64_t val, uint64_t operand, uint32_t outbits) {
uint32_t shift = (operand >> 58) & 0x1f;
if (operand & (1ull << 63)) {
if (shift >= 16) {
val = bf16_from_f32((uint32_t)val);
} else {
__asm("fcvt %h0, %s0" : "=w"(val) : "0"(val));
}
return val;
}
if (shift && (operand & EXTR_ROUNDING_SHIFT)) {
val += 1 << (shift - 1);
}
val >>= shift;
if (operand & EXTR_SATURATE) {
if (operand & EXTR_SIGNED_OUTPUT) outbits -= 1;
int64_t hi = 1ull << outbits;
if (operand & EXTR_SIGNED_INPUT) {
int64_t lo = (operand & EXTR_SIGNED_OUTPUT) ? -hi : 0;
if (val < lo) val = lo;
if (val >= hi) val = hi - 1;
} else {
if ((uint64_t)val >= (uint64_t)hi) val = hi - 1;
}
}
return val;
}
static void store_xy_row(void* dst, uint64_t offset, const void* src, uint64_t write_mask) {
for (uint64_t i = 0; i < 64; ++i) {
if (!((write_mask >> i) & 1)) continue;
((uint8_t*)dst)[(offset + i) & 0x1ff] = ((const uint8_t*)src)[i];
}
}
void emulate_AMX_EXTRX(amx_state* state, uint64_t operand) {
void* dst;
uint64_t dst_offset;
uint64_t z_row = operand >> 20;
uint64_t z_step = 64;
uint64_t store_enable = ~(uint64_t)0;
uint8_t buffer[64];
uint32_t stride = 0;
uint32_t zbytes, xybytes;
if (operand & EXTR_HV) {
dst = (operand & EXTR_HV_TO_Y) ? state->y : state->x;
dst_offset = operand;
switch (((operand >> 63) << 4) | ((operand >> 11) & 0xF)) {
case 0: xybytes = 1; zbytes = 1; break;
case 8: xybytes = 4; zbytes = 4; break;
case 9: xybytes = 2; zbytes = 4; stride = 1; break;
case 10: xybytes = 2; zbytes = 4; stride = 2; break;
case 11: xybytes = 1; zbytes = 4; stride = 1; break;
case 13: xybytes = 1; zbytes = 2; stride = 1; break;
case 17: xybytes = 8; zbytes = 8; break;
case 24: xybytes = 4; zbytes = 4; break;
case 25: xybytes = 2; if (AMX_VER >= AMX_VER_M2) { zbytes = 4; stride = 1; } else { zbytes = 2; } break;
case 26: xybytes = 2; if (AMX_VER >= AMX_VER_M2) { zbytes = 4; stride = 2; } else { zbytes = 2; } break;
default: xybytes = 2; zbytes = 2; break;
}
if ((AMX_VER >= AMX_VER_M2) && (operand & (1ull << 31))) {
operand &=~ (0x1ffull << 32);
z_step = z_row & 32 ? 16 : 32;
}
store_enable &= parse_writemask(operand >> 32, xybytes, 9);
} else if (operand & EXTR_BETWEEN_XY) {
memcpy(state->x + ((operand >> 16) & 7),
state->y + ( z_row & 7), 64);
return;
} else {
dst = state->x;
dst_offset = operand >> 10;
xybytes = 8 >> ((operand >> 28) & 3);
if (xybytes == 1) {
xybytes = 2;
store_enable &= 0x5555555555555555ull;
}
store_enable &= parse_writemask(operand >> 41, xybytes, 7);
zbytes = xybytes;
}
uint32_t signext = (operand & EXTR_SIGNED_INPUT) ? 64 - zbytes*8 : 0;
for (z_row &= z_step - 1; z_row <= 63; z_row += z_step) {
for (uint32_t i = 0; i < 64; i += xybytes) {
uint64_t zoff = (i & (zbytes - 1)) / xybytes * stride;
int64_t val = load_int(&state->z[bit_select(z_row, z_row + zoff, zbytes - 1)].u8[i & -zbytes], zbytes, signext);
if (stride) val = extr_alu(val, operand, xybytes*8);
store_int(buffer + i, xybytes, val);
}
if ((operand & EXTR_HV) && (((operand >> 32) & 0x1ff) == 3)) {
memset(buffer, 0, sizeof(buffer));
}
store_xy_row(dst, dst_offset & 0x1FF, buffer, store_enable);
dst_offset += 64;
}
}
void emulate_AMX_EXTRY(amx_state* state, uint64_t operand) {
void* dst;
uint64_t dst_offset = operand;
uint64_t z_col = operand >> 20;
uint64_t z_step = 64;
uint64_t store_enable = ~(uint64_t)0;
uint8_t buffer[64];
uint32_t stride = 0;
uint32_t zbytes, xybytes;
if (operand & EXTR_HV) {
dst = (operand & EXTR_HV_TO_Y) ? state->y : state->x;
switch (((operand >> 63) << 4) | ((operand >> 11) & 0xF)) {
case 0: xybytes = 1; zbytes = 1; break;
case 8: xybytes = 4; zbytes = 4; break;
case 9: xybytes = 2; zbytes = 4; stride = 1; break;
case 10: xybytes = 2; zbytes = 4; stride = 2; break;
case 11: xybytes = 1; zbytes = 4; stride = 1; break;
case 13: xybytes = 1; zbytes = 2; stride = 1; break;
case 17: xybytes = 8; zbytes = 8; break;
case 24: xybytes = 4; zbytes = 4; break;
case 25: xybytes = 2; if (AMX_VER >= AMX_VER_M2) { zbytes = 4; stride = 1; } else { zbytes = 2; } break;
case 26: xybytes = 2; if (AMX_VER >= AMX_VER_M2) { zbytes = 4; stride = 2; } else { zbytes = 2; } break;
default: xybytes = 2; zbytes = 2; break;
}
if ((AMX_VER >= AMX_VER_M2) && (operand & (1ull << 31))) {
operand &=~ (0x1ffull << 32);
z_step = z_col & 32 ? 16 : 32;
}
store_enable &= parse_writemask(operand >> 32, xybytes, 9);
} else if (operand & EXTR_BETWEEN_XY) {
memcpy(state->y + ((operand >> 6) & 7),
state->x + (z_col & 7), 64);
return;
} else {
dst = state->y;
xybytes = 8 >> ((operand >> 28) & 3);
if (xybytes == 1) {
xybytes = 2;
store_enable &= 0x5555555555555555ull;
}
store_enable &= parse_writemask(operand >> 32, xybytes, 7);
zbytes = xybytes;
}
uint32_t signext = (operand & EXTR_SIGNED_INPUT) ? 64 - zbytes*8 : 0;
for (z_col &= z_step - 1; z_col <= 63; z_col += z_step) {
for (uint32_t j = 0; j < 64; j += xybytes) {
uint64_t zoff = (j & (zbytes - 1)) / xybytes * stride;
int64_t val = load_int(&state->z[bit_select(j, z_col + zoff, zbytes - 1)].u8[z_col & -zbytes], zbytes, signext);
if (stride) val = extr_alu(val, operand, xybytes*8);
store_int(buffer + j, xybytes, val);
}
if (((operand >> 32) & 0x1ff) == 3) {
memset(buffer, 0, sizeof(buffer));
}
store_xy_row(dst, dst_offset & 0x1FF, buffer, store_enable);
dst_offset += 64;
}
}