--- /dev/null
+extsb, 0xFFFFFFFFFFFFFF91 , 0xFFFFFF91 , 0xFF91 , 0x91
+extsh, 0x0000000000000091 , 0x00000091 , 0x0091 , 0x91
+extsw, 0x0000000000000091 , 0x00000091 , 0x0091 , 0x91
--- /dev/null
+extsb, 0x0000000000000074 , 0x00000074 , 0x0074 , 0x74
+extsh, 0xFFFFFFFFFFFFF074 , 0xFFFFF074 , 0xF074 , 0x74
+extsw, 0x000000000000F074 , 0x0000F074 , 0xF074 , 0x74
--- /dev/null
+func , XLEN=64 , XLEN=32 , XLEN=16 , XLEN=8
+extsb, 0x0000000000000011 , 0x00000011 , 0x0011 , 0x11
+extsh, 0x0000000000001111 , 0x00001111 , 0x1111 , 0x11
+extsw, 0x0000000011111111 , 0x11111111 , 0x1111 , 0x11
--- /dev/null
+func , XLEN=64 , XLEN=32 , XLEN=16 , XLEN=8
+extsb, 0xffffffffffffff93 , 0xffffff93 , 0xff93 , 0x93
+extsh, 0x0000000000000A93 , 0x00000A93 , 0x0A93 , 0x93
+extsw, 0xffffffff90000A93 , 0x90000A93 , 0x0A93 , 0x93
+