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ggml : fix mamba2 ssm scan when compiled with SVE

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Francis Couture-Harpin
2025-06-11 12:33:05 -04:00
parent 2fa5f2ceb8
commit 757aa6239d
1 changed files with 33 additions and 1 deletions
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34
ggml/src/ggml-cpu/ops.cpp
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@ -7664,6 +7664,37 @@ static void ggml_compute_forward_ssm_scan_f32(
const float x_dt = x[ii] * dt_soft_plus;
float sumf = 0.0f;
#if defined(GGML_SIMD)
#if defined(__ARM_FEATURE_SVE)
const int ggml_f32_epr = svcntw();
const int ggml_f32_step = 1 * ggml_f32_epr;
const int np = (nc & ~(ggml_f32_step - 1));
GGML_F32_VEC sum = GGML_F32_VEC_ZERO;
GGML_F32_VEC adA = GGML_F32_VEC_SET1(dA);
GGML_F32_VEC axdt = GGML_F32_VEC_SET1(x_dt);
for (int i = 0; i < np; i += ggml_f32_step) {
// TODO: maybe unroll more?
for (int j = 0; j < 1; j++) {
GGML_F32_VEC t0 = GGML_F32_VEC_LOAD(s0 + i + j*ggml_f32_epr + ii*nc);
GGML_F32_VEC t1 = GGML_F32_VEC_LOAD(B + i + j*ggml_f32_epr + (h & (ng - 1))*nc);
GGML_F32_VEC t2 = GGML_F32_VEC_LOAD(C + i + j*ggml_f32_epr + (h & (ng - 1))*nc);
t0 = GGML_F32_VEC_MUL(t0, adA);
t1 = GGML_F32_VEC_MUL(t1, axdt);
t0 = GGML_F32_VEC_ADD(t0, t1);
sum = GGML_F32_VEC_FMA(sum, t0, t2);
GGML_F32_VEC_STORE(s + i + j*ggml_f32_epr + ii*nc, t0);
}
}
sumf = GGML_F32xt_REDUCE_ONE(sum);
#else
const int np = (nc & ~(GGML_F32_STEP - 1));
GGML_F32_VEC sum[GGML_F32_ARR] = { GGML_F32_VEC_ZERO };
@ -7694,6 +7725,7 @@ static void ggml_compute_forward_ssm_scan_f32(
// reduce sum0..sum3 to sum0
GGML_F32_VEC_REDUCE(sumf, sum);
#endif
#else
const int np = 0;
#endif
@ -7722,7 +7754,7 @@ static void ggml_compute_forward_ssm_scan_f32(
for (int i1 = 0; i1 < nr; ++i1) {
const int ii = i1 + h*nr;
const float x_dt = x[ii] * dt_soft_plus;
#ifdef __ARM_FEATURE_SVE
#if defined(__ARM_FEATURE_SVE)
svfloat32_t vx_dt = GGML_F32_VEC_SET1(x_dt);
svfloat32_t vdt_soft_plus = GGML_F32_VEC_SET1(dt_soft_plus);
svfloat32_t r1_vector = GGML_F32_VEC_ZERO;