Hi On Tue, 29 Mar 2022 at 12:39, Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> wrote:
> 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. > IIRC, It was Monchil who improved the CFI into the Machine Outliner ;) I don't think of something obvious w/r to outlining as it, if you need some help I think I'd have some time next week > > 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
