ref: f0f2d452c873255dec4b3359b3f93e349be0f2c5
dir: /sys/src/libmp/arm/mpvecsub.s/
TEXT mpvecsub(SB),$0 MOVW alen+4(FP), R4 MOVW b+8(FP), R5 MOVW blen+12(FP), R6 MOVW diff+16(FP), R7 MOVW $0, R8 MOVW R8, R3 CMP R8, R6 B.EQ _sub1 SUB R6, R4, R4 _subloop1: MOVW.P 4(R0), R1 MOVW.P 4(R5), R2 CMP R3, R8 SBC.S R2, R1 SBC R8, R8, R3 MOVW.P R1, 4(R7) SUB.S $1, R6 B.NE _subloop1 _sub1: CMP R8, R4 RET.EQ _subloop2: MOVW.P 4(R0), R1 CMP R3, R8 SBC.S R8, R1 SBC R8, R8, R3 MOVW.P R1, 4(R7) SUB.S $1, R4 B.NE _subloop2 RET