Update 3A6000 data (#4894)

benchmark/README.md

@@ -3847,6 +3847,51 @@ cooling_down = 0
           FastestDet  min =    7.66  max =    7.90  avg =    7.80
 ```
 
+### Loongson 3A6000 (LA664 2.5GHz * 4+4)
+
+```
+~/ncnn/build/benchmark$ ./benchncnn 10 8 2 -1 0
+loop_count = 10
+num_threads = 8
+powersave = 2
+gpu_device = -1
+cooling_down = 0
+          squeezenet  min =    7.12  max =    7.20  avg =    7.16
+     squeezenet_int8  min =    8.93  max =    9.20  avg =    8.98
+           mobilenet  min =   11.81  max =   11.88  avg =   11.84
+      mobilenet_int8  min =   14.25  max =   14.33  avg =   14.28
+        mobilenet_v2  min =    8.06  max =    8.16  avg =    8.08
+        mobilenet_v3  min =    6.84  max =    6.90  avg =    6.87
+          shufflenet  min =    5.38  max =    5.44  avg =    5.39
+       shufflenet_v2  min =    5.20  max =    5.22  avg =    5.20
+             mnasnet  min =    8.06  max =    8.10  avg =    8.07
+     proxylessnasnet  min =    8.94  max =    9.09  avg =    8.99
+     efficientnet_b0  min =   13.43  max =   13.65  avg =   13.48
+   efficientnetv2_b0  min =   16.06  max =   16.18  avg =   16.11
+        regnety_400m  min =   18.11  max =   18.18  avg =   18.14
+           blazeface  min =    1.59  max =    1.61  avg =    1.60
+           googlenet  min =   26.08  max =   26.24  avg =   26.17
+      googlenet_int8  min =   31.25  max =   31.42  avg =   31.34
+            resnet18  min =   19.65  max =   19.73  avg =   19.69
+       resnet18_int8  min =   25.55  max =   25.66  avg =   25.60
+             alexnet  min =   19.56  max =   19.81  avg =   19.67
+               vgg16  min =  115.32  max =  116.38  avg =  115.99
+          vgg16_int8  min =  135.94  max =  136.73  avg =  136.34
+            resnet50  min =   56.46  max =   56.96  avg =   56.81
+       resnet50_int8  min =   66.13  max =   66.40  avg =   66.27
+      squeezenet_ssd  min =   22.84  max =   22.99  avg =   22.89
+ squeezenet_ssd_int8  min =   22.34  max =   22.76  avg =   22.54
+       mobilenet_ssd  min =   24.67  max =   24.75  avg =   24.71
+  mobilenet_ssd_int8  min =   29.32  max =   29.37  avg =   29.34
+      mobilenet_yolo  min =   82.82  max =   84.02  avg =   83.40
+  mobilenetv2_yolov3  min =   30.31  max =   30.45  avg =   30.38
+         yolov4-tiny  min =   42.49  max =   42.74  avg =   42.62
+           nanodet_m  min =   11.00  max =   11.08  avg =   11.02
+    yolo-fastest-1.1  min =    5.28  max =    5.40  avg =    5.31
+      yolo-fastestv2  min =    5.09  max =    5.10  avg =    5.10
+  vision_transformer  min =  869.40  max =  898.18  avg =  874.07
+          FastestDet  min =    5.28  max =    5.37  avg =    5.31
+```
 
 ### Phytium FT-2000/4 (FTC663 armv8 2.2GHz x 4)
 Test on Kylin OS V10