Merge branch 'opt-vulkan-gemm-2' of github.com:nihui/ncnn into opt-vulkan-gemm-2

Author: nihui

docs/developer-guide/glsl-extension.md

@@ -219,6 +219,13 @@ afp lfp2afp(lfp v);
 afpvec4 lfp2afpvec4(lfpvec4 v);
 ```
 
+- local variable to local memory
+
+```c
+lfp afp2lfp(afp v);
+lfpvec4 afp2lfpvec4(afpvec4 v);
+```
+
 Note: The common usage of local memory is to read from global memory first, store it in local memory, and then read local variables from local memory for subsequent use. Therefore, only storage type to local type and local type to arithmetic type conversion functions are provided here.
 
 # misc functions

docs/developer-guide/glsl-extension.zh.md

@@ -220,6 +220,13 @@ afp lfp2afp(lfp v);
 afpvec4 lfp2afpvec4(lfpvec4 v);
 ```
 
+- 局部变量转换到本地内存
+
+```c
+lfp afp2lfp(afp v);
+lfpvec4 afp2lfpvec4(afpvec4 v);
+```
+
 注意：本地内存的常见用法是先从全局内存中读取，存储在本地内存中，然后再从本地内存中读取局部变量以供后续使用。因此，此处仅提供存储类型到本地类型和本地类型到算术类型的转换函数。
 
 # 杂项函数