Hi Momchil, Thanks for looking into this!
Looking at the binaries (attached) text size has increased ... $ size 456.hmmer-before.elf text data bss dec hex filename 104960 3221 81752 189933 2e5ed ./456.hmmer-before.elf $ size 456.hmmer-after.elf text data bss dec hex filename 113912 3221 81752 198885 308e5 ./456.hmmer-after.elf ... due to .eh_frame_hdr and .eh_frame sections: [Nr] Name Type Address Off Size ES Flg Lk Inf Al BEFORE: [12] .eh_frame_hdr PROGBITS 0000000000204848 004848 0004cc 00 A 0 0 4 [13] .eh_frame PROGBITS 0000000000204d18 004d18 0015bc 00 A 0 0 8 AFTER: [12] .eh_frame_hdr PROGBITS 0000000000204848 004848 0004cc 00 A 0 0 4 [13] .eh_frame PROGBITS 0000000000204d18 004d18 0015bc 00 A 0 0 8 . This problem seems to be occurring only at -Oz -flto, and it is the outlined functions most affected. CC’ing Yvan (who worked on outliner recently) who may have some insight into inner workings of outliner, LTO and unwind info. Regards, -- Maxim Kuvyrkov https://www.linaro.org > On 28 Mar 2022, at 19:46, Momchil Velikov <momchil.veli...@arm.com> wrote: > >> Your patch seems to significantly increase code-size of several benchmarks — >> by up to 9%. Would >> you please investigate whether this can be avoided? > > Could you, please, confirm if the size increase is due to having bigger > `.eh_frame`/`.debug_frame` sections? > > It looks like the reason is generating a bunch of non-sensical unwind info > entries for outlined functions, e.g.: > > 000000bc 0000000000000010 000000c0 FDE cie=00000000 > pc=0000000000000c34..0000000000000c3c > DW_CFA_nop > DW_CFA_nop > DW_CFA_nop > > I'm working on a patch to not emit .cfi_startproc/.cfi_endproc if a function > does not contain any CFI instructions. > > ~chill > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. _______________________________________________ linaro-toolchain mailing list -- linaro-toolchain@lists.linaro.org To unsubscribe send an email to linaro-toolchain-le...@lists.linaro.org
