ref: e391b7ec8c0dc746a70725f3fc598def0419d1e6
dir: /sys/src/libc/riscv64/memccpy.s/
/* void* memccpy(void *s1, void *s2, int c, ulong n) */ TEXT memccpy(SB), $0 MOV R8, 0(FP) MOVW n+(2*XLEN+4)(FP), R8 BEQ R8, ret MOV s1+0(FP), R10 MOV s2+XLEN(FP), R9 MOVBU c+(2*XLEN)(FP), R11 ADD R8, R9, R12 l1: MOVBU (R9), R13 ADD $1, R9 MOVB R13, (R10) ADD $1, R10 BEQ R11, R13, eq BNE R9, R12, l1 MOV R0, R8 RET eq: MOV R10, R8 ret: RET