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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2018-12-11 19:29:35 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2018-12-11 19:33:09 +0100 |
| commit | 09d8df84ee908b940a31822c3480f36f817e4f09 (patch) | |
| tree | 0d0f74ee0ad31cea2f31090161ac22b457650f00 /Makefile | |
| parent | 7f4daa4f5842b26c5f3e233819e583573eeebaf6 (diff) | |
| download | busybox-09d8df84ee908b940a31822c3480f36f817e4f09.tar.gz | |
bc: do not use "(cond ? f1 : f2)(params)" idiom, it messes up static function optimizations
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>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions