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https://github.com/ggerganov/llama.cpp.git
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ggml : remove Q5_0 bit shuffling (ARM NEON)
This commit is contained in:
Georgi Gerganov
parent
a6a1d96c91
commit
796f8ae261
198
ggml.c
198
ggml.c
@ -626,39 +626,6 @@ static inline const uint8_t * bytes_from_nibbles_64(const int qk, const uint8_t
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return (const uint8_t *) qd;
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}
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// pack first half of weights into low nibbles and second half into high nibbles
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// use one scaling factor
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static inline void nibbles_from_floats_64_0(const int qk, const float * x, float id, uint8_t * qs, uint64_t * qd) {
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = x[0 + l]*id;
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const float v1 = x[qk/2 + l]*id;
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const uint64_t vi0 = MIN(15, (int8_t)(v0 + 8.5f));
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const uint64_t vi1 = MIN(15, (int8_t)(v1 + 8.5f));
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qd[l/8] |= vi0 << (8*(l & 7));
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qd[l/8] |= vi1 << (8*(l & 7) + 4);
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}
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memcpy(qs, qd, qk/2);
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}
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// use offset and scaling factor
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static inline void nibbles_from_floats_64_1(const int qk, const float * x, float id, float min, uint8_t * qs, uint64_t * qd) {
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = (x[0 + l] - min)*id;
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const float v1 = (x[qk/2 + l] - min)*id;
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const uint64_t vi0 = MIN(15, (int8_t)(v0 + 0.5f));
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const uint64_t vi1 = MIN(15, (int8_t)(v1 + 0.5f));
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qd[l/8] |= vi0 << (8*(l & 7));
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qd[l/8] |= vi1 << (8*(l & 7) + 4);
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}
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memcpy(qs, qd, qk/2);
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}
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#if !defined(__aarch64__)
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inline static uint16_t vaddvq_u8(uint8x16_t v) {
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@ -907,7 +874,18 @@ static void quantize_row_q4_0_reference(const float * restrict x, block_q4_0 * r
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uint64_t qs[QK4_0 / 16] = {0};
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nibbles_from_floats_64_0(qk, x + i*qk, id, y[i].qs, qs);
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = x[i*qk + 0 + l]*id;
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const float v1 = x[i*qk + qk/2 + l]*id;
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const uint64_t vi0 = MIN(15, (int8_t)(v0 + 8.5f));
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const uint64_t vi1 = MIN(15, (int8_t)(v1 + 8.5f));
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qs[l/8] |= vi0 << (8*(l & 7));
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qs[l/8] |= vi1 << (8*(l & 7) + 4);
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}
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memcpy(y[i].qs, qs, qk/2);
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}
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}
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@ -942,7 +920,18 @@ static void quantize_row_q4_1_reference(const float * restrict x, block_q4_1 * r
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uint64_t qs[QK4_1 / 16] = {0};
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nibbles_from_floats_64_1(qk, x + i*qk, id, min, y[i].qs, qs);
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = (x[0 + l] - min)*id;
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const float v1 = (x[qk/2 + l] - min)*id;
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const uint64_t vi0 = MIN(15, (int8_t)(v0 + 0.5f));
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const uint64_t vi1 = MIN(15, (int8_t)(v1 + 0.5f));
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qs[l/8] |= vi0 << (8*(l & 7));
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qs[l/8] |= vi1 << (8*(l & 7) + 4);
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}
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memcpy(y[i].qs, qs, qk/2);
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}
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}
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@ -978,7 +967,18 @@ static void quantize_row_q4_2_reference(const float * restrict x, block_q4_2 * r
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uint64_t qs[QK4_2 / 16] = {0};
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nibbles_from_floats_64_0(qk, x + i*qk, id, y[i].qs, qs);
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = x[i*qk + 0 + l]*id;
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const float v1 = x[i*qk + qk/2 + l]*id;
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const uint64_t vi0 = MIN(15, (int8_t)(v0 + 8.5f));
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const uint64_t vi1 = MIN(15, (int8_t)(v1 + 8.5f));
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qs[l/8] |= vi0 << (8*(l & 7));
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qs[l/8] |= vi1 << (8*(l & 7) + 4);
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}
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memcpy(y[i].qs, qs, qk/2);
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}
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}
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@ -987,51 +987,54 @@ static void quantize_row_q4_2(const float * restrict x, void * restrict y, int k
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}
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static void quantize_row_q5_0_reference(const float * restrict x, block_q5_0 * restrict y, int k) {
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assert(k % QK5_0 == 0);
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const int nb = k / QK5_0;
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static const int qk = QK5_0;
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assert(qk / 16 == 0);
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assert( k % qk == 0);
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const int nb = k / qk;
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for (int i = 0; i < nb; i++) {
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float amax = 0.0f; // absolute max
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float max = 0.0f;
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float max = 0.0f;
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for (int l = 0; l < QK5_0; l++) {
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const float v = x[i*QK5_0 + l];
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for (int l = 0; l < qk; l++) {
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const float v = x[i*qk + l];
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if (amax < fabsf(v)) {
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amax = fabsf(v);
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max = v;
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max = v;
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}
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}
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const float d = max / -16;
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const float d = max / -16;
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const float id = d ? 1.0f/d : 0.0f;
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y[i].d = GGML_FP32_TO_FP16(d);
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y[i].d = d;
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uint32_t qh = 0;
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uint64_t qs[QK5_0 / 16] = {0};
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for (int l = 0; l < QK5_0; l += 2) {
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const float v0 = x[i*QK5_0 + l + 0]*id;
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const float v1 = x[i*QK5_0 + l + 1]*id;
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for (int l = 0; l < qk/2; ++l) {
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const float v0 = x[i*qk + 0 + l]*id;
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const float v1 = x[i*qk + qk/2 + l]*id;
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const uint32_t vi0 = MIN(31, (int) (v0 + 16.5f));
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const uint32_t vi1 = MIN(31, (int) (v1 + 16.5f));
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const uint64_t vi0 = MIN(31, (int8_t)(v0 + 16.5f));
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const uint64_t vi1 = MIN(31, (int8_t)(v1 + 16.5f));
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y[i].qs[l/2] = (vi0 & 0x0F) | ((vi1 & 0x0F) << 4);
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qs[l/8] |= vi0 << (8*(l & 7));
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qs[l/8] |= vi1 << (8*(l & 7) + 4);
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// get the 5-th bit and store it in qh at the right position
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qh |= ((vi0 & 0x10) >> 4) << (l + 0);
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qh |= ((vi1 & 0x10) >> 4) << (l + 1);
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qh |= ((vi1 & 0x10) >> 4) << (l + qk/2);
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}
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memcpy(&y[i].qh, &qh, sizeof(y[i].qh));
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memcpy( y[i].qs, qs, qk/2);
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memcpy(&y[i].qh, &qh, sizeof(qh));
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}
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}
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static void quantize_row_q5_0(const float * restrict x, void * restrict vy, int k) {
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assert(k % QK5_0 == 0);
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block_q5_0 * restrict y = vy;
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static void quantize_row_q5_0(const float * restrict x, void * restrict y, int k) {
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quantize_row_q5_0_reference(x, y, k);
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}
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@ -1500,38 +1503,28 @@ static void dequantize_row_q4_2(const block_q4_2 * restrict x, float * restrict
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}
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}
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static void dequantize_row_q5_0(const void * restrict vx, float * restrict y, int k) {
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assert(k % QK5_0 == 0);
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const int nb = k / QK5_0;
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static void dequantize_row_q5_0(const block_q5_0 * restrict x, float * restrict y, int k) {
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static const int qk = QK4_0;
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const block_q5_0 * restrict x = vx;
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assert(qk / 16 == 0);
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assert( k % qk == 0);
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const int nb = k / qk;
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uint64_t qs[QK5_0 / 8];
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for (int i = 0; i < nb; i++) {
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const float d = GGML_FP16_TO_FP32(x[i].d);
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const uint8_t * restrict pp = x[i].qs;
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uint32_t qh;
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memcpy(&qh, x[i].qh, sizeof(qh));
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for (int l = 0; l < QK5_0; l += 2) {
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const uint8_t vi = pp[l/2];
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const uint8_t * qsp = bytes_from_nibbles_64(qk, x[i].qs, qs);
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// extract the 5-th bit from qh
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const uint8_t vh0 = ((qh & (1u << (l + 0))) >> (l + 0)) << 4;
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const uint8_t vh1 = ((qh & (1u << (l + 1))) >> (l + 1)) << 4;
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for (int l = 0; l < qk; ++l) {
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const uint8_t vh = ((qh & (1u << l)) >> l) << 4;
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const int8_t vi0 = (vi & 0x0F) | vh0;
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const int8_t vi1 = (vi >> 4) | vh1;
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const float v0 = (vi0 - 16)*d;
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const float v1 = (vi1 - 16)*d;
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y[i*QK5_0 + l + 0] = v0;
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y[i*QK5_0 + l + 1] = v1;
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assert(!isnan(y[i*QK5_0 + l + 0]));
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assert(!isnan(y[i*QK5_0 + l + 1]));
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y[i*qk + l] = ((qsp[l] | vh) - 16)*d;
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}
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}
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}
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@ -1623,7 +1616,7 @@ static const quantize_fns_t quantize_fns[GGML_TYPE_COUNT] = {
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.vec_dot_type = GGML_TYPE_Q8_0,
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},
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[GGML_TYPE_Q5_0] = {
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.dequantize_row_q = dequantize_row_q5_0,
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.dequantize_row_q = (dequantize_row_q_t) dequantize_row_q5_0,
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.quantize_row_q = quantize_row_q5_0,
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.quantize_row_q_reference = (quantize_row_q_t) quantize_row_q5_0_reference,
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.quantize_row_q_dot = quantize_row_q8_0,
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@ -2693,11 +2686,12 @@ static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void *
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}
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static void ggml_vec_dot_q5_0_q8_0(const int n, float * restrict s, const void * restrict vx, const void * restrict vy) {
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const int nb = n / QK8_0;
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const int qk = QK8_0;
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const int nb = n / qk;
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assert(n % QK8_0 == 0);
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assert(n % qk == 0);
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assert(nb % 2 == 0);
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assert(QK8_0 == QK5_0);
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assert(qk == QK5_0);
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const block_q5_0 * restrict x = vx;
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const block_q8_0 * restrict y = vy;
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@ -2732,13 +2726,9 @@ static void ggml_vec_dot_q5_0_q8_0(const int n, float * restrict s, const void *
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const int8x16_t v0l = vreinterpretq_s8_u8(vandq_u8 (v0, m4b));
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const int8x16_t v0h = vreinterpretq_s8_u8(vshrq_n_u8(v0, 4));
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// interleave
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const int8x16_t v0lz = vzip1q_s8(v0l, v0h);
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const int8x16_t v0hz = vzip2q_s8(v0l, v0h);
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// add high bit and sub 16
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const int8x16_t v0lf = vsubq_s8(vorrq_s8(v0lz, qhl), s16b);
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const int8x16_t v0hf = vsubq_s8(vorrq_s8(v0hz, qhh), s16b);
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const int8x16_t v0lf = vsubq_s8(vorrq_s8(v0l, qhl), s16b);
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const int8x16_t v0hf = vsubq_s8(vorrq_s8(v0h, qhh), s16b);
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// load y
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const int8x16_t v1l = vld1q_s8(y0->qs);
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@ -2856,34 +2846,28 @@ static void ggml_vec_dot_q5_0_q8_0(const int n, float * restrict s, const void *
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#else
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// scalar
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float sumf = 0.0;
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uint64_t qs[QK8_0 / 8];
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for (int i = 0; i < nb; i++) {
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const uint8_t * restrict x0 = x[i].qs;
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const int8_t * restrict y0 = y[i].qs;
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// unpack nibbles into bytes
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const uint8_t * px = bytes_from_nibbles_64(qk, x[i].qs, qs);
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const int8_t * py = y[i].qs;
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uint32_t qh;
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memcpy(&qh, x[i].qh, sizeof(qh));
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const float d = GGML_FP16_TO_FP32(x[i].d);
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int sumi = 0;
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int sxy = 0;
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for (int j = 0; j < qk; ++j) {
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const int xh = ((qh & (1u << j)) >> j) << 4;
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for (int j = 0; j < QK8_0/2; j++) {
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const uint8_t v0 = x0[j];
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const int x0_0h = ((qh & (1u << (2*j + 0))) >> (2*j + 0)) << 4;
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const int x1_0h = ((qh & (1u << (2*j + 1))) >> (2*j + 1)) << 4;
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const int x0_0 = ((v0 & 0x0F) | x0_0h) - 16;
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const int x1_0 = ((v0 >> 4) | x1_0h) - 16;
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const int y0_0 = y0[2*j + 0];
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const int y1_0 = y0[2*j + 1];
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sxy += x0_0*y0_0 + x1_0*y1_0;
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sumi += ((px[j] | xh) - 16)*py[j];
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}
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sumf += (d*sxy)*y[i].d;
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sumf += (GGML_FP16_TO_FP32(x[i].d)*y[i].d)*sumi;
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}
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*s = sumf;
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#endif
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}
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