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205 lines (186 loc) · 5.96 KB
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#include "aarch64.h"
#include "emulate.h"
#include <stdio.h>
// Little xoshiro256++ random number generator
static uint64_t s[4];
static void rand_init() {
s[0] = 0x180ec6d33cfd0abaULL;
s[1] = 0xd5a61266f0c9392cULL;
s[2] = 0xa9582618e03fc9aaULL;
s[3] = 0x39abdc4529b1661cULL;
}
static inline uint64_t rotl(const uint64_t x, int k) {
return (x << k) | (x >> (64 - k));
}
static uint64_t rand_next(void) {
const uint64_t result = rotl(s[1] * 5, 7) * 9;
const uint64_t t = s[1] << 17;
s[2] ^= s[0];
s[3] ^= s[1];
s[1] ^= s[2];
s[0] ^= s[3];
s[2] ^= t;
s[3] = rotl(s[3], 45);
return result;
}
static void rand_fill(void* dst, size_t sz) {
while (sz >= 8) {
uint64_t r = rand_next();
memcpy(dst, &r, 8);
dst = (void*)(8 + (char*)dst);
sz -= 8;
}
if (sz) {
uint64_t r = rand_next();
memcpy(dst, &r, sz);
}
}
// Logic for copying between hardware AMX state and emulated AMX state
#define PTR_ROW_FLAGS(ptr, row, flags) (((uint64_t)&*(ptr)) + (((uint64_t)((row) + (flags) * 64)) << 56))
static void capture_state(amx_state* dst) {
uint32_t row = 0;
for (; row < 8; row += 2) {
AMX_STX(PTR_ROW_FLAGS(dst->x[row].u8, row, 1));
AMX_STY(PTR_ROW_FLAGS(dst->y[row].u8, row, 1));
AMX_STZ(PTR_ROW_FLAGS(dst->z[row].u8, row, 1));
}
for (; row < 64; row += 2) {
AMX_STZ(PTR_ROW_FLAGS(dst->z[row].u8, row, 1));
}
}
static void inject_state(const amx_state* src) {
uint32_t row = 0;
for (; row < 8; row += 2) {
AMX_LDX(PTR_ROW_FLAGS(src->x[row].u8, row, 1));
AMX_LDY(PTR_ROW_FLAGS(src->y[row].u8, row, 1));
AMX_LDZ(PTR_ROW_FLAGS(src->z[row].u8, row, 1));
}
for (; row < 64; row += 2) {
AMX_LDZ(PTR_ROW_FLAGS(src->z[row].u8, row, 1));
}
}
// Test bindings
typedef struct ldst_test_buffer {
uint8_t bytes[256 + 128];
} ldst_test_buffer;
#define TEST_BINDING_LDST(op) \
static void test_##op(amx_state* state, uint64_t operand, ldst_test_buffer* buf) { \
extern void emulate_##op(amx_state* state, uint64_t operand); \
operand &= (0xffull << 56) | 0xff; \
if ((operand & (1ull << 62)) && ((#op)[7] != 'I')) operand &=~ 0x7full; \
operand += (uint64_t)buf; \
op(operand); \
operand += sizeof(ldst_test_buffer); \
emulate_##op(state, operand); \
}
#define TEST_BINDING(op) \
static void test_##op(amx_state* state, uint64_t operand, ldst_test_buffer* buf) { \
extern void emulate_##op(amx_state* state, uint64_t operand); \
(void)buf; \
op(operand); \
emulate_##op(state, operand); \
}
TEST_BINDING_LDST(AMX_LDX)
TEST_BINDING_LDST(AMX_LDY)
TEST_BINDING_LDST(AMX_STX)
TEST_BINDING_LDST(AMX_STY)
TEST_BINDING_LDST(AMX_LDZ)
TEST_BINDING_LDST(AMX_STZ)
TEST_BINDING_LDST(AMX_LDZI)
TEST_BINDING_LDST(AMX_STZI)
TEST_BINDING(AMX_EXTRX)
TEST_BINDING(AMX_EXTRY)
TEST_BINDING(AMX_MAC16)
TEST_BINDING(AMX_FMA16)
TEST_BINDING(AMX_FMA32)
TEST_BINDING(AMX_FMA64)
TEST_BINDING(AMX_FMS16)
TEST_BINDING(AMX_FMS32)
TEST_BINDING(AMX_FMS64)
TEST_BINDING(AMX_VECINT)
TEST_BINDING(AMX_VECFP)
TEST_BINDING(AMX_MATINT)
TEST_BINDING(AMX_MATFP)
TEST_BINDING(AMX_GENLUT)
#undef TEST_BINDING
static bool run_test(const char* name, void(*fn)(amx_state*, uint64_t, ldst_test_buffer*)) {
amx_state original, emulated, actual;
__attribute__((aligned(256))) ldst_test_buffer ldst[2];
rand_init();
for (int outer = 0; outer < 10000; ++outer) {
if ((outer & 255) == 0) {
printf("\rTesting %s... %d", name, outer);
fflush(stdout);
}
rand_fill(&original, sizeof(amx_state));
memcpy(&emulated, &original, sizeof(amx_state));
rand_fill(ldst, sizeof(ldst_test_buffer));
memcpy(ldst + 1, ldst, sizeof(ldst_test_buffer));
AMX_SET();
inject_state(&original);
for (int inner = 0; inner < 1000; ++inner) {
uint64_t op = rand_next();
fn(&emulated, op, ldst);
capture_state(&actual);
if (memcmp(&actual, &emulated, sizeof(amx_state)) != 0 || memcmp(ldst, ldst + 1, sizeof(ldst_test_buffer)) != 0) {
AMX_CLR();
printf("\rTesting %s... Failed on iteration %d.%d (operand %#llx)\n", name, outer, inner, (long long unsigned)op);
return false;
}
memcpy(&original, &emulated, sizeof(amx_state));
}
AMX_CLR();
}
printf("\rTesting %s... OK \n", name);
return true;
}
static uint64_t fpcr_init() {
uint64_t old_fpcr;
__asm volatile ("mrs %0, fpcr" : "=r"(old_fpcr));
uint64_t new_fpcr = old_fpcr | (1ull << 25); // DN (Default NaN)
__asm volatile ("msr fpcr, %0" : : "r"(new_fpcr));
return old_fpcr;
}
static void fpcr_restore(uint64_t fpcr) {
__asm volatile ("msr fpcr, %0" : : "r"(fpcr));
}
uint32_t AMX_VER;
static uint32_t detect_amx_hardware_version() {
__attribute__((aligned(256))) uint8_t buf[256];
buf[128] = 1;
AMX_SET(); // Set x[0:8] to zero
AMX_LDX(PTR_ROW_FLAGS(buf, 16, 1)); // On M1: copy buf[0:128] to x[0:2], on M2: copy buf[0:256] to x[0:4]
AMX_STX(PTR_ROW_FLAGS(buf, 2, 0)); // Copy x[2] to buf[0:64]
AMX_CLR();
return buf[0] == 1 ? AMX_VER_M2 : AMX_VER_M1;
}
int main() {
AMX_VER = detect_amx_hardware_version();
uint64_t old_fpcr = fpcr_init();
#define RUN_TEST(op) run_test(#op, test_##op)
RUN_TEST(AMX_LDX);
RUN_TEST(AMX_LDY);
RUN_TEST(AMX_LDZ);
RUN_TEST(AMX_LDZI);
RUN_TEST(AMX_STX);
RUN_TEST(AMX_STY);
RUN_TEST(AMX_STZ);
RUN_TEST(AMX_STZI);
RUN_TEST(AMX_EXTRX);
RUN_TEST(AMX_EXTRY);
RUN_TEST(AMX_MAC16);
RUN_TEST(AMX_FMA16);
RUN_TEST(AMX_FMA32);
RUN_TEST(AMX_FMA64);
RUN_TEST(AMX_FMS16);
RUN_TEST(AMX_FMS32);
RUN_TEST(AMX_FMS64);
RUN_TEST(AMX_VECINT);
RUN_TEST(AMX_VECFP);
RUN_TEST(AMX_MATINT);
RUN_TEST(AMX_MATFP);
RUN_TEST(AMX_GENLUT);
#undef RUN_TEST
fpcr_restore(old_fpcr);
return 0;
}