From: Tom Tromey <tom@tromey.com>
To: John Baldwin <jhb@FreeBSD.org>
Cc: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH 2/9] Introduce and use language_set
Date: Fri, 08 Mar 2019 22:21:00 -0000 [thread overview]
Message-ID: <87ftrxdn3r.fsf@tromey.com> (raw)
In-Reply-To: <6387c828-db23-3e49-fb76-699f5fc9e82b@FreeBSD.org> (John Baldwin's message of "Thu, 7 Mar 2019 15:04:38 -0800")
>>>>> "John" == John Baldwin <jhb@FreeBSD.org> writes:
John> On 3/7/19 12:57 PM, Tom Tromey wrote:
>> I noticed that objfile_per_bfd_storage::demangled_hash_languages is a
>> std::vector, which seemed quite large for something that,
>> fundamentally, can be represented as a bit-set. This patch
>> reimplements it as a bit-set.
John> Hmm, did you consider using std::bitset<nr_languages> for langauge_set? You'd
John> still have to write your own iterator class, so it wouldn't save much in terms
John> of lines of code. It just seems a bit odd to write a bitset class from scratch?
I didn't really consider it.
I looked now and on my machine, std::bitset<nr_languages> is 8 bytes,
whereas langauge_set is just 4. So, with the custom implementation, I
could pack it into a hole in objfile_per_bfd_storage.
That said, due to the minsym arrays, objfile_per_bfd_storage is
enormous, so saving 4 bytes probably isn't important. So, I'll redo
this.
Tom
next prev parent reply other threads:[~2019-03-08 22:21 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 21:11 [PATCH 0/9] Minor minimal symbol improvements Tom Tromey
2019-03-07 20:57 ` [PATCH 3/9] Remove some unneeded initializations in minimal_symbol_reader Tom Tromey
2019-03-07 20:57 ` [PATCH 2/9] Introduce and use language_set Tom Tromey
2019-03-07 23:05 ` John Baldwin
2019-03-08 22:21 ` Tom Tromey [this message]
2019-03-08 22:43 ` Tom Tromey
2019-03-08 23:44 ` John Baldwin
2019-03-07 20:57 ` [PATCH 4/9] Remove minsym termination Tom Tromey
2019-03-07 20:57 ` [PATCH 8/9] Use memcpy in minimal_symbol_reader::install Tom Tromey
2019-03-07 20:57 ` [PATCH 6/9] Use htab_up for demangled hash Tom Tromey
2019-03-07 20:57 ` [PATCH 5/9] Simplify per-BFD storage management Tom Tromey
2019-03-07 20:57 ` [PATCH 9/9] Change minimal_symbol inheritance Tom Tromey
2019-03-07 20:57 ` [PATCH 7/9] Allocate minimal symbols with malloc Tom Tromey
2019-03-07 20:57 ` [PATCH 1/9] Slightly simplify minsym creation Tom Tromey
2019-03-15 22:04 ` [PATCH 0/9] Minor minimal symbol improvements Tom Tromey
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