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ggml-cpu: add mxfp4 VSX intrinsics for Power9+ (ppc64le) hardware (#15385)

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* Added VSX intrinsics for Power9+ systems

Signed-off-by: mgiessing <marvin.giessing@gmail.com>

* Manual unrolling for minor perf improvement

Signed-off-by: mgiessing <marvin.giessing@gmail.com>

* Update ggml/src/ggml-cpu/arch/powerpc/quants.c

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

---------

Signed-off-by: mgiessing <marvin.giessing@gmail.com>
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Marvin Gießing
2025-08-19 10:54:31 +02:00
committed by GitHub
parent e9288e8869
commit 6424594c56
2 changed files with 66 additions and 1 deletions
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1
ggml/src/ggml-cpu/arch-fallback.h
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@@ -73,7 +73,6 @@
#define ggml_vec_dot_tq1_0_q8_K_generic ggml_vec_dot_tq1_0_q8_K
#define ggml_vec_dot_tq2_0_q8_K_generic ggml_vec_dot_tq2_0_q8_K
#define ggml_vec_dot_iq1_m_q8_K_generic ggml_vec_dot_iq1_m_q8_K
#define ggml_vec_dot_mxfp4_q8_0_generic ggml_vec_dot_mxfp4_q8_0
// repack.cpp
#define ggml_quantize_mat_q8_0_4x4_generic ggml_quantize_mat_q8_0_4x4
#define ggml_quantize_mat_q8_0_4x8_generic ggml_quantize_mat_q8_0_4x8

66
ggml/src/ggml-cpu/arch/powerpc/quants.c
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@@ -278,6 +278,72 @@ void ggml_vec_dot_q4_1_q8_1(int n, float * GGML_RESTRICT s, size_t bs, const voi
#endif
}
void ggml_vec_dot_mxfp4_q8_0(int n, float * GGML_RESTRICT s, size_t bs, const void * GGML_RESTRICT vx, size_t bx, const void * GGML_RESTRICT vy, size_t by, int nrc) {
assert(nrc == 1);
UNUSED(nrc);
UNUSED(bx);
UNUSED(by);
UNUSED(bs);
assert(n % QK_MXFP4 == 0);
static_assert(QK_MXFP4 == QK8_0, "QK_MXFP4 and QK8_0 must be the same");
const block_mxfp4 * GGML_RESTRICT x = vx;
const block_q8_0 * GGML_RESTRICT y = vy;
const int nb = n / QK_MXFP4;
int ib = 0;
float sumf = 0;
#if defined(__POWER9_VECTOR__)
const vector signed char lowMask = vec_splats((signed char)0xF);
const vector unsigned char vshift4 = vec_splats((unsigned char)4);
vector float vsumf0 = vec_splats(0.0f);
vector signed char kv = vec_xl(0, (const signed char *)kvalues_mxfp4);
#pragma GCC unroll 8
for (; ib < nb; ++ib) {
__builtin_prefetch(x[ib].qs, 0, 1);
__builtin_prefetch(y[ib].qs, 0, 1);
vector float vyd = vec_splats(GGML_CPU_FP16_TO_FP32(y[ib].d) *
GGML_E8M0_TO_FP32_HALF(x[ib].e));
vector signed char q8y0 = vec_xl( 0, y[ib].qs);
vector signed char q8y1 = vec_xl(16, y[ib].qs);
vector signed char qxs = (vector signed char)vec_xl(0, x[ib].qs);
vector unsigned char lo_nibbles = (vector unsigned char)vec_and(qxs, lowMask);
vector unsigned char hi_nibbles = (vector unsigned char)vec_sr(qxs, vshift4);
vector signed char q4x0 = vec_perm(kv, kv, lo_nibbles);
vector signed char q4x1 = vec_perm(kv, kv, hi_nibbles);
vector signed short qv0 = vec_add(vec_mule(q4x0, q8y0), vec_mulo(q4x0, q8y0));
vector signed short qv1 = vec_add(vec_mule(q4x1, q8y1), vec_mulo(q4x1, q8y1));
vector signed int vsumi0 = vec_splats((int32_t)0);
vsumi0 = vec_sum4s(qv0, vsumi0);
vsumi0 = vec_sum4s(qv1, vsumi0);
vsumf0 = vec_madd(vec_ctf(vsumi0, 0), vyd, vsumf0);
}
vsumf0 = vec_add(vsumf0, vec_sld(vsumf0, vsumf0, 4));
vsumf0 = vec_add(vsumf0, vec_sld(vsumf0, vsumf0, 8));
sumf = vec_extract(vsumf0, 0);
*s = sumf;
#else
UNUSED(x);
UNUSED(y);
UNUSED(ib);
UNUSED(sumf);
ggml_vec_dot_mxfp4_q8_0_generic(n, s, bs, vx, bx, vy, by, nrc);
#endif
}
void ggml_vec_dot_q5_0_q8_0(int n, float * GGML_RESTRICT s, size_t bs, const void * GGML_RESTRICT vx, size_t bx, const void * GGML_RESTRICT vy, size_t by, int nrc) {
const int qk = QK8_0;
const int nb = n / qk;