Subtract and branch if negativeใ
ๅผใ็ฎใใฆใใคใในใซใชใฃใใใธใฃใณใใใใใใชใใๅฝไปค่ชใ้ทใใชใใใ
ๆใใใๆผ็ฎใๆฏ่ผใง็นๅฎๆกไปถใๆบใใใจใๆฌกใฎๅฝไปคใ้ฃใฐใใใชใใฆใใใขใผใใซใชๅไฝใใใCPUใฏใใฃใใใใใใใๅฎ่ฃ ใฏRISCๅใใใใชใใฎใ ใใใใใๅใใใใ