generate more precice case statements for built abs and signum methods
generate more precice case statements for built abs and signum methods

darcs-hash:20061222030959-1a7c6-626f1f5451fc961f5ee7b21c75c369c1a91fe618

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc