With direct calls, GCC no longer thinks that we take addresses of the functions,
and can use "more optimal" internal ABI for _all_ calls to these functions,
not only at this callsite. On i486, regparm is used, and:
function old new delta
zbc_num_inv 56 57 +1
zbc_num_k 852 851 -1
zbc_program_modexp 558 556 -2
zbc_num_d 541 539 -2
bc_num_ulong2num 59 57 -2
zbc_program_num 840 836 -4
bc_num_zero 11 7 -4
bc_num_one 28 24 -4
bc_program_exec 3928 3918 -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/8 up/down: 1/-29) Total: -28 bytes
text data bss dec hex filename
982237 485 7296 990018 f1b42 busybox_old
982209 485 7296 989990 f1b26 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
09d8df84ee