CVSROOT: /cvs Module name: src Changes by: [email protected] 2021/07/23 09:31:14
Modified files:
sys/arch/riscv64/riscv64: copy.S
Log message:
Use 8/4/1 bytes loads/stores for copyin/copyout/kcopy
Only use multiple bytes operations on properly aligned addresses, as
I have observed a 40x penalty for unaligned 8 bytes operations compared
to equivalent 1-byte loops on this Sifive Unmatched. The speed gain is
small but significant.
Input & ok kettenis@
