ggml-cpu : minor rvv adjustments

Author: xctan

ggml/CMakeLists.txt

@@ -131,6 +131,7 @@ option(GGML_LSX              "ggml: enable lsx"              ON)
 option(GGML_RVV              "ggml: enable rvv"              ON)
 option(GGML_RV_ZFH           "ggml: enable riscv zfh"        ON)
 option(GGML_RV_ZVFH          "ggml: enable riscv zvfh"       ON)
+option(GGML_RV_ZICBOP        "ggml: enable riscv zicbop"     ON)
 option(GGML_XTHEADVECTOR     "ggml: enable xtheadvector"     OFF)
 option(GGML_VXE              "ggml: enable vxe"              ON)
 option(GGML_NNPA             "ggml: enable nnpa"             OFF)  # temp disabled by default, see: https://github.com/ggml-org/llama.cpp/issues/14877

ggml/src/ggml-cpu/CMakeLists.txt

@@ -441,10 +441,13 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
             string(APPEND MARCH_STR "_xtheadvector")
         elseif (GGML_RVV)
             string(APPEND MARCH_STR "_v")
-            if (GGML_ZVFH)
+            if (GGML_RV_ZVFH)
                 string(APPEND MARCH_STR "_zvfh")
             endif()
         endif()
+        if (GGML_RV_ZICBOP)
+            string(APPEND MARCH_STR "_zicbop")
+        endif()
         list(APPEND ARCH_FLAGS "-march=${MARCH_STR}" -mabi=lp64d)
     elseif (GGML_SYSTEM_ARCH STREQUAL "s390x")
         message(STATUS "s390x detected")

ggml/src/ggml-cpu/arch/riscv/quants.c

@@ -1769,6 +1769,8 @@ void ggml_vec_dot_q6_K_q8_K(int n, float * GGML_RESTRICT s, size_t bs, const voi
     case 128:
         for (int i = 0; i < nb; ++i) {
 
+            __builtin_prefetch(&x[i + 1].d, 0, 1);
+
             const float d = GGML_CPU_FP16_TO_FP32(x[i].d) * y[i].d;
 
             const uint8_t * restrict q6 = x[i].ql;