only append to cpu string if not initialized (#125)

* only append to cpu string if not initialized

* Fix code style

---------

Co-authored-by: Alex <saharNooby@users.noreply.github.com>

rwkv.cpp

@@ -1931,19 +1931,21 @@ bool rwkv_quantize_model_file(const char * in_path, const char * out_path, const
 const char * rwkv_get_system_info_string(void) {
     static std::string s;
 
-    s  = "";
-    s += "AVX="       + std::to_string(ggml_cpu_has_avx())       + " ";
-    s += "AVX2="      + std::to_string(ggml_cpu_has_avx2())      + " ";
-    s += "AVX512="    + std::to_string(ggml_cpu_has_avx512())    + " ";
-    s += "FMA="       + std::to_string(ggml_cpu_has_fma())       + " ";
-    s += "NEON="      + std::to_string(ggml_cpu_has_neon())      + " ";
-    s += "ARM_FMA="   + std::to_string(ggml_cpu_has_arm_fma())   + " ";
-    s += "F16C="      + std::to_string(ggml_cpu_has_f16c())      + " ";
-    s += "FP16_VA="   + std::to_string(ggml_cpu_has_fp16_va())   + " ";
-    s += "WASM_SIMD=" + std::to_string(ggml_cpu_has_wasm_simd()) + " ";
-    s += "BLAS="      + std::to_string(ggml_cpu_has_blas())      + " ";
-    s += "SSE3="      + std::to_string(ggml_cpu_has_sse3())      + " ";
-    s += "VSX="       + std::to_string(ggml_cpu_has_vsx());
+    if (s.empty()) {
+        s  = "";
+        s += "AVX="       + std::to_string(ggml_cpu_has_avx())       + " ";
+        s += "AVX2="      + std::to_string(ggml_cpu_has_avx2())      + " ";
+        s += "AVX512="    + std::to_string(ggml_cpu_has_avx512())    + " ";
+        s += "FMA="       + std::to_string(ggml_cpu_has_fma())       + " ";
+        s += "NEON="      + std::to_string(ggml_cpu_has_neon())      + " ";
+        s += "ARM_FMA="   + std::to_string(ggml_cpu_has_arm_fma())   + " ";
+        s += "F16C="      + std::to_string(ggml_cpu_has_f16c())      + " ";
+        s += "FP16_VA="   + std::to_string(ggml_cpu_has_fp16_va())   + " ";
+        s += "WASM_SIMD=" + std::to_string(ggml_cpu_has_wasm_simd()) + " ";
+        s += "BLAS="      + std::to_string(ggml_cpu_has_blas())      + " ";
+        s += "SSE3="      + std::to_string(ggml_cpu_has_sse3())      + " ";
+        s += "VSX="       + std::to_string(ggml_cpu_has_vsx());
+    }
 
     return s.c_str();
 }