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ggml : loop tiling optimizations for scalar path (ggml/898)

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Apply a loop tiling technique to the generic path, which provides
performance upside for ISAs with enough registers to take advantage
of it. Also helps the compiler optimize this path.
This commit is contained in:
Mahesh Madhav 2024-07-25 00:54:08 -07:00 committed by Georgi Gerganov
parent 9f77d899b7
commit a05ca93697
1 changed files with 22 additions and 10 deletions
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32
ggml/src/ggml-quants.c
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@ -4190,15 +4190,18 @@ void ggml_vec_dot_q4_0_q8_0(int n, float * restrict s, size_t bs, const void * r
sumf = hsum_float_4x4(acc_0, acc_1, acc_2, acc_3);
#endif
for (; ib < nb; ++ib) {
int sumi = 0;
int sumi0 = 0;
int sumi1 = 0;
for (int j = 0; j < qk/2; ++j) {
const int v0 = (x[ib].qs[j] & 0x0F) - 8;
const int v1 = (x[ib].qs[j] >> 4) - 8;
sumi += (v0 * y[ib].qs[j]) + (v1 * y[ib].qs[j + qk/2]);
sumi0 += (v0 * y[ib].qs[j]);
sumi1 += (v1 * y[ib].qs[j + qk/2]);
}
int sumi = sumi0 + sumi1;
sumf += sumi*GGML_FP16_TO_FP32(x[ib].d)*GGML_FP16_TO_FP32(y[ib].d);
}
@ -4474,15 +4477,18 @@ void ggml_vec_dot_q4_1_q8_1(int n, float * restrict s, size_t bs, const void * r
sumf = hsum_float_8(acc) + summs;
#endif
for (; ib < nb; ++ib) {
int sumi = 0;
int sumi0 = 0
int sumi1 = 0;
for (int j = 0; j < qk/2; ++j) {
const int v0 = (x[ib].qs[j] & 0x0F);
const int v1 = (x[ib].qs[j] >> 4);
sumi += (v0 * y[ib].qs[j]) + (v1 * y[ib].qs[j + qk/2]);
sumi0 += (v0 * y[ib].qs[j]);
sumi1 += (v1 * y[ib].qs[j + qk/2]);
}
int sumi = sumi0 + sumi1;
sumf += (GGML_FP16_TO_FP32(x[ib].d)*GGML_FP16_TO_FP32(y[ib].d))*sumi + GGML_FP16_TO_FP32(x[ib].m)*GGML_FP16_TO_FP32(y[ib].s);
}
@ -4823,18 +4829,21 @@ void ggml_vec_dot_q5_0_q8_0(int n, float * restrict s, size_t bs, const void * r
uint32_t qh;
memcpy(&qh, x[ib].qh, sizeof(qh));
int sumi = 0;
int sumi0 = 0;
int sumi1 = 0;
for (int j = 0; j < qk/2; ++j) {
const uint8_t xh_0 = ((qh & (1u << (j + 0 ))) >> (j + 0 )) << 4;
const uint8_t xh_1 = ((qh & (1u << (j + 16))) >> (j + 12));
const int32_t x0 = ((x[ib].qs[j] & 0x0F) | xh_0) - 16;
const int32_t x1 = ((x[ib].qs[j] >> 4) | xh_1) - 16;
const int32_t x0 = (int8_t)(((x[ib].qs[j] & 0x0F) | xh_0) - 16);
const int32_t x1 = (int8_t)(((x[ib].qs[j] >> 4) | xh_1) - 16);
sumi += (x0 * y[ib].qs[j]) + (x1 * y[ib].qs[j + qk/2]);
sumi0 += (x0 * y[ib].qs[j]);
sumi1 += (x1 * y[ib].qs[j + qk/2]);
}
int sumi = sumi0 + sumi1;
sumf += (GGML_FP16_TO_FP32(x[ib].d)*GGML_FP16_TO_FP32(y[ib].d)) * sumi;
}
@ -5194,7 +5203,8 @@ void ggml_vec_dot_q5_1_q8_1(int n, float * restrict s, size_t bs, const void * r
uint32_t qh;
memcpy(&qh, x[ib].qh, sizeof(qh));
int sumi = 0;
int sumi0 = 0;
int sumi1 = 0;
for (int j = 0; j < qk/2; ++j) {
const uint8_t xh_0 = ((qh >> (j + 0)) << 4) & 0x10;
@ -5203,9 +5213,11 @@ void ggml_vec_dot_q5_1_q8_1(int n, float * restrict s, size_t bs, const void * r
const int32_t x0 = (x[ib].qs[j] & 0xF) | xh_0;
const int32_t x1 = (x[ib].qs[j] >> 4) | xh_1;
sumi += (x0 * y[ib].qs[j]) + (x1 * y[ib].qs[j + qk/2]);
sumi0 += (x0 * y[ib].qs[j]);
sumi1 += (x1 * y[ib].qs[j + qk/2]);
}
int sumi = sumi0 + sumi1;
sumf += (GGML_FP16_TO_FP32(x[ib].d)*GGML_FP16_TO_FP32(y[ib].d))*sumi + GGML_FP16_TO_FP32(x[ib].m)*GGML_FP16_TO_FP32(y[ib].s);
}