ref: ca4adfc25048e99a0063d8fd06f4b2bb2ded4c8f
dir: /sys/src/libthread/xincpower.s/
TEXT _xinc(SB),$0 /* void _xinc(long *); */ MOVW R3, R4 xincloop: LWAR (R4), R3 ADD $1, R3 DCBT (R4) /* fix 405 errata cpu_210 */ STWCCC R3, (R4) BNE xincloop RETURN TEXT _xdec(SB),$0 /* long _xdec(long *); */ MOVW R3, R4 xdecloop: LWAR (R4), R3 ADD $-1, R3 DCBT (R4) /* fix 405 errata cpu_210 */ STWCCC R3, (R4) BNE xdecloop RETURN