$eos:
negq t1, t4 # e0 : isolate first null byte match
and t1, t4, t4 # e1 :
- subq t4, 1, t5 # e0 : build a mask of the bytes upto...
+ subq t4, 1, t5 # e0 : build a mask of the bytes up to...
or t4, t5, t4 # e1 : ... and including the null
and t3, t4, t3 # e0 : mask out char matches after null