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bug#41357: 28.0.50; GC may miss to mark calle safe register content
From: |
Andrea Corallo |
Subject: |
bug#41357: 28.0.50; GC may miss to mark calle safe register content |
Date: |
Sun, 17 May 2020 20:23:02 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
>> Eli's platform is 32-bit Microsoft Windows, and W32 has four callee-save
>> registers (ebx, esi, edi, ebp) not counting esp and eip which are of course
>> callee-save by definition. So the problem could at least in theory be
>> occurring
>> on his platform, depending on the compiler and its options.
>
> I've seen the same problem on 64-bit Windows as well, in Emacs
> compiled with a different (newer) version of GCC. I don't think this
> has anything to do with how many registers are there. I also never
> before saw these problems, so this is most definitely due to some
> recent changes, I just cannot yet figure out which ones.
It's hard to say but I suspect the main gate that saved us till today is
'garbage_collect' that being quite big is likely to have calle-save regs
spilled.
You can disassemble your 'garbage_collect' and see if all of this regs
are spilled (in my case they are at -O2). This could give an indication
on the correlation of the two bugs (but nothing more).
Andrea
--
akrl@sdf.org
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Paul Eggert, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Pip Cet, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Paul Eggert, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content,
Andrea Corallo <=
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Paul Eggert, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Paul Eggert, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Eli Zaretskii, 2020/05/17
- bug#41357: 28.0.50; GC may miss to mark calle safe register content, Andrea Corallo, 2020/05/17