question: private Instruction scheduleScalarDefsEarly ( Enumeration < Operand > e , Instruction earlyPos , Instruction inst ) { while ( e . hasMoreElements ( ) ) { Operand op = e . nextElement ( ) ; Instruction def = definingInstruction ( op ) ; scheduleEarly ( def ) ; if ( def . isBranch ( ) ) def = dominanceSuccessor ( def , inst ) ; earlyPos = maxDominatorDepth ( def , earlyPos ) ; } return earlyPos ; }
target:  Schedules an instruction as early as possible, but behind the definitions in e and behind earlyPos