159   //   binop scratch, dest, val  in doAtomicBinOpExpansion()
160   //   sc.[w|d] scratch, scratch, (addr)  in doAtomicBinOpExpansion()
161   //   beqz scratch, loop  in doAtomicBinOpExpansion()
251   //   binop scratch, destreg, incr  in doMaskedAtomicBinOpExpansion()
252   //   xor scratch, destreg, scratch  in doMaskedAtomicBinOpExpansion()
253   //   and scratch, scratch, masktargetdata  in doMaskedAtomicBinOpExpansion()
254   //   xor scratch, destreg, scratch  in doMaskedAtomicBinOpExpansion()
255   //   sc.w scratch, scratch, (alignedaddr)  in doMaskedAtomicBinOpExpansion()
256   //   beqz scratch, loop  in doMaskedAtomicBinOpExpansion()
515     //   move scratch, newval  in expandAtomicCmpXchg()
516     //   sc.[w|d] scratch, scratch, (addr)  in expandAtomicCmpXchg()
517     //   beqz scratch, loophead  in expandAtomicCmpXchg()
535     //   and scratch, dest, mask  in expandAtomicCmpXchg()
536     //   bne scratch, cmpval, tail  in expandAtomicCmpXchg()
551     //   andn scratch, dest, mask  in expandAtomicCmpXchg()
552     //   or scratch, scratch, newval  in expandAtomicCmpXchg()
553     //   sc.[w|d] scratch, scratch, (addr)  in expandAtomicCmpXchg()
554     //   beqz scratch, loophead  in expandAtomicCmpXchg()