[SYCL] fallback mmvq (ggml-org#9088)

* fallback mmvq to mul_mat

* mmvq in cuda path

* Update ggml/src/ggml-sycl.cpp

Co-authored-by: Alberto Cabrera Pérez <[email protected]>

---------

Co-authored-by: Alberto Cabrera Pérez <[email protected]>

Author: airMeng

ggml/src/ggml-sycl.cpp

@@ -3477,7 +3477,8 @@ static void ggml_sycl_mul_mat(ggml_backend_sycl_context & ctx, const ggml_tensor
 
     bool use_mul_mat_vec_q =  ggml_is_quantized(src0->type)
         && src1->type == GGML_TYPE_F32 && dst->type == GGML_TYPE_F32
-        && src1->ne[1] <= MMVQ_MAX_BATCH_SIZE;
+        && src1->ne[1] <= MMVQ_MAX_BATCH_SIZE
+        && (ctx.stream()->get_backend() == sycl::backend::ext_oneapi_cuda || src1->ne[1] > MMVQ_MIN_BATCH_SIZE);
 
     bool use_mul_mat_q =  ggml_sycl_supports_mmq(src0->type)
         && src1->type == GGML_TYPE_F32 && dst->type == GGML_TYPE_F32;

ggml/src/ggml-sycl/common.hpp

@@ -130,6 +130,7 @@ typedef sycl::float2 dfloat2;
 #endif // GGML_SYCL_F16
 
 #define MMVQ_MAX_BATCH_SIZE  8
+#define MMVQ_MIN_BATCH_SIZE  4
 
 static const int8_t kvalues_iq4nl[16]={-127, -104, -83, -65, -49, -35, -22, -10, 1, 13, 25, 38, 53, 69, 89, 113};