Georg-Johann Lay schrieb:
Denis Chertykov schrieb:
What difference in size of avr-libc ?
I have no tool for smart size analysis, so here is just a diff:
After rebuilding avr-libc with respective compiler version, did respectively:
$ find . -name 'lib[mc].a' -exec avr-size {} ';' > size-orig.txt
$ find . -name 'lib[mc].a' -exec avr-size {} ';' > size-patch.txt
and then
$ diff -U 0 size-orig.txt size-patch.txt > size.diff
As far as I can see, there is not a big gain but no object increases in size.
For some files like ./avr/lib/avr2/libc.a:dtoa_prf.o size gain is 3%.
For ./avr/lib/avr4/libc.a:vfprintf_std.o it's 1.7% and for others just one
instruction better.
Actually there are some cases where the size increases by one instruction:
- 464 0 0 464 1d0 realloc.o (ex
./avr/lib/avr31/libc.a)
+ 466 0 0 466 1d2 realloc.o (ex
./avr/lib/avr31/libc.a)
- 464 0 0 464 1d0 realloc.o (ex
./avr/lib/avr3/libc.a)
+ 466 0 0 466 1d2 realloc.o (ex
./avr/lib/avr3/libc.a)
Will have a look tomorrow; presumably it's adding +/-1 that force a
scratch whilst the old code does not.
Johann
