public List<SsaInsn> getUseListForRegister(int reg) {

    if (unmodifiableUseList == null) {
      buildUseList();
    }

    return unmodifiableUseList[reg];
  }
Returns the list of all source uses (not results) for a register.

@param reg register in question
@return unmodifiable instruction list
android/android_framework/dex-maker/src/main/java/com/android/dx/ssa/SsaMethod.java