Performance can be gained by replacing the "branch always"
at the end of a loop with a conditional branch, thus
avoiding a branch for exiting in the middle of loop.

For example:

        bge,pn %xcc, endLoop
        nop
        mov %g4, %o3
        ba,pt %icc, beginLoop
        nop
endLoop:

can be transformed into:

        mov %g4, %o3
        bl,pt %xcc, beginLoop
        nop

since there is no harm in executing the "mov" in the
case when the branch is not taken (the loop is exiting).