Risc-v instruction set

la x18,symbol

take symbol The address of is loaded into x[rd] in .

lwu x19,0x00（x18）

Unsigned word loading (Load Word, Unsigned), From address x18 +0x00 Read four bytes , Write after zero extension x19.

bnez x19,pass

If x19 It's not equal to 0, go pass Branch ; if x19=0, Then continue . 

li x19,0x01

sw x19,0x00（x18）

x.dcbst x0,x18 

take 0x01 write in x19 register ;x19 Register contents are stored in x18+0x00 Of catch in ; take （x0+x18） Address data is stored in memory .

x.sync

Register configuration or load/store Sync ,  Such as register configuration or load/store Execution completed , Then execute the following instructions .