* [Bug exp/20991] __int128 type support
[not found] <bug-20991-4717@http.sourceware.org/bugzilla/>
@ 2020-04-10 0:21 ` ssbssa at sourceware dot org
2021-07-21 12:19 ` cvs-commit at gcc dot gnu.org
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From: ssbssa at sourceware dot org @ 2020-04-10 0:21 UTC (permalink / raw)
To: gdb-prs
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Hannes Domani <ssbssa at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ssbssa at sourceware dot org
--- Comment #4 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to Tom Tromey from comment #0)
> I tried a couple experiments with __int128 and found some gdb issues.
>
> My test code:
>
> __int128 x = 72;
>
> I compiled with -g -c then ran gdb on the .o.
>
> Printing kind of works, but chooses hex by default and zero-pads:
>
> (gdb) p x
> $1 = 0x00000000000000000000000000000048
>
> Specifying decimal still zero-pads, which looks very weird:
>
> (gdb) p/d x
> $2 = 00000000000000000000000000000072
>
> Addition doesn't work:
>
> (gdb) p x + 5
> That operation is not available on integers of more than 8 bytes.
There is no longer zero-padding since 8.1, but addition still doesn't work.
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2020-04-10 0:21 ` [Bug exp/20991] __int128 type support ssbssa at sourceware dot org
@ 2021-07-21 12:19 ` cvs-commit at gcc dot gnu.org
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--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0057a7ee0d963eb9aee5cdfb9d6da5279bc8caf9
commit 0057a7ee0d963eb9aee5cdfb9d6da5279bc8caf9
Author: Tom de Vries <tdevries@suse.de>
Date: Wed Jul 21 14:19:51 2021 +0200
[gdb/testsuite] Add KFAILs for gdb.ada FAILs with gcc-11
With gcc-11 we run into:
...
(gdb) print pa_ptr.all^M
That operation is not available on integers of more than 8 bytes.^M
(gdb) KFAIL: gdb.ada/arrayptr.exp: scenario=all: print pa_ptr.all (PRMS:
gdb/20991)
...
This is due to PR exp/20991 - "__int128 type support". Mark this and
similar
FAILs as KFAIL.
Also mark this FAIL:
....
(gdb) print pa_ptr(3)^M
cannot subscript or call something of type `foo__packed_array_ptr'^M
(gdb) FAIL: gdb.ada/arrayptr.exp: scenario=minimal: print pa_ptr(3)
...
as a KFAIL for PR ada/28115 - "Support packed array encoded as
DW_TAG_subrange_type".
Tested on x86_64-linux, with gcc-10 and gcc-11.
gdb/testsuite/ChangeLog:
2021-07-21 Tom de Vries <tdevries@suse.de>
* gdb.ada/arrayptr.exp: Add KFAILs for PR20991 and PR28115.
* gdb.ada/exprs.exp: Add KFAILs for PR20991.
* gdb.ada/packed_array_assign.exp: Same.
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2020-04-10 0:21 ` [Bug exp/20991] __int128 type support ssbssa at sourceware dot org
2021-07-21 12:19 ` cvs-commit at gcc dot gnu.org
@ 2021-07-21 12:22 ` cvs-commit at gcc dot gnu.org
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--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-11-branch branch has been updated by Tom de Vries
<vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f26101b199482bd13b5f9c45fb4f43a4eb8b16e6
commit f26101b199482bd13b5f9c45fb4f43a4eb8b16e6
Author: Tom de Vries <tdevries@suse.de>
Date: Wed Jul 21 14:22:16 2021 +0200
[gdb/testsuite] Add KFAILs for gdb.ada FAILs with gcc-11
With gcc-11 we run into:
...
(gdb) print pa_ptr.all^M
That operation is not available on integers of more than 8 bytes.^M
(gdb) KFAIL: gdb.ada/arrayptr.exp: scenario=all: print pa_ptr.all (PRMS:
gdb/20991)
...
This is due to PR exp/20991 - "__int128 type support". Mark this and
similar
FAILs as KFAIL.
Also mark this FAIL:
....
(gdb) print pa_ptr(3)^M
cannot subscript or call something of type `foo__packed_array_ptr'^M
(gdb) FAIL: gdb.ada/arrayptr.exp: scenario=minimal: print pa_ptr(3)
...
as a KFAIL for PR ada/28115 - "Support packed array encoded as
DW_TAG_subrange_type".
Tested on x86_64-linux, with gcc-10 and gcc-11.
gdb/testsuite/ChangeLog:
2021-07-21 Tom de Vries <tdevries@suse.de>
* gdb.ada/arrayptr.exp: Add KFAILs for PR20991 and PR28115.
* gdb.ada/exprs.exp: Add KFAILs for PR20991.
* gdb.ada/packed_array_assign.exp: Same.
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From: tromey at sourceware dot org @ 2023-02-23 16:37 UTC (permalink / raw)
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--- Comment #7 from Tom Tromey <tromey at sourceware dot org> ---
*** Bug 21185 has been marked as a duplicate of this bug. ***
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From: tromey at sourceware dot org @ 2023-02-23 16:44 UTC (permalink / raw)
To: gdb-prs
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--- Comment #8 from Tom Tromey <tromey at sourceware dot org> ---
In bug #21185, using gcc's wide-int was suggested as one option.
I looked into this, and I can make wide-int compile in gdb
with some hacks. However, since gdb already requires GMP,
I think it's probably better to just use that.
Also it seems like there are multiple parts to this bug.
Perhaps we should treat them individually...
* Parsers should recognize 128-bit types and lexers should make
128-bit quantities.
* valops should extract a GMP from a struct value and work on that
representation.
* Type ranges / dynamic props should be converted to 128-bit
quantities where needed. (My thinking here is that the
data would be stored in some convenient & compact format,
but convert to GMP when working with the values.)
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From: pedro at palves dot net @ 2023-02-23 19:40 UTC (permalink / raw)
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Pedro Alves <pedro at palves dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pedro at palves dot net
--- Comment #9 from Pedro Alves <pedro at palves dot net> ---
GMP has a surprising and unfortunate design choice that IMHO may make it
undesirable for a fixed-width type -- it uses the heap for _every_ integer.
This is last discussed in this thread:
https://sourceware.org/pipermail/gdb/2022-October/050375.html
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--- Comment #10 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Pedro Alves from comment #9)
> GMP has a surprising and unfortunate design choice that IMHO may make it
> undesirable for a fixed-width type -- it uses the heap for _every_ integer.
I suspect it won't matter much, but if it does, we can always
adopt wide-int.
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--- Comment #11 from Pedro Alves <pedro at palves dot net> ---
Yeah, or something else. As long as the type we use looks like an integer
(implements arithmetic operators, etc.), then swapping one implementation for
another is not a big deal.
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--- Comment #12 from Pedro Alves <pedro at palves dot net> ---
I was looking at whether GMP already has built-in support for _finite_
precision, for example so that we handle wraparound of "unsigned __int128"
values propertly, left shifting, etc. I couldn't find anything for that, so I
guess we'd have to implement wraparound, etc. ourselves?
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From: tromey at sourceware dot org @ 2023-02-24 14:46 UTC (permalink / raw)
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--- Comment #13 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Pedro Alves from comment #12)
> I was looking at whether GMP already has built-in support for _finite_
> precision, for example so that we handle wraparound of "unsigned __int128"
> values propertly, left shifting, etc. I couldn't find anything for that, so
> I guess we'd have to implement wraparound, etc. ourselves?
Yeah. I suppose gcc's is nicer this way, you can specify the
precision.
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--- Comment #14 from Tom Tromey <tromey at sourceware dot org> ---
> Yeah. I suppose gcc's is nicer this way, you can specify the
> precision.
It occurs to me, though, that not many things in gdb are using
"chained" expressions. Normally we'd unpack a value to a GMP,
operate on it, then put it back into a value. So, frequently,
we wouldn't actually have to worry about the size of intermediates
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--- Comment #15 from Pedro Alves <pedro at palves dot net> ---
That may be true. If we can make valarith.c:scalar_binop work for any
kind of fixed-precision type instead of doing host arithmetic on LONGEST, with
the precision being a runtime property, then we would get most of value
arithmetic done for all types, including types wider than 128 bits when they
come.
It still seems to me though like if we need to implement the fixed-precision
logic, we might as well consider factoring it out to an integer class. That
type may be based on wide-int, some other integer template (there are plenty
such templates around we could borrow), or a wrapper around GMP (or a
fixed-precision wrapper around our C++ GMP infinite-precision wrapper).
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--- Comment #16 from Tom Tromey <tromey at sourceware dot org> ---
Yeah. I even considered just writing our own.
Monday or so I'll push my WIP patch to add wide-int to the tree
and you can see what it looks like. A few hacks were needed,
though nothing too serious. Mostly I couldn't be bothered to
figure out how all the classes work.
The main attraction of GMP is we already have it, and I recently
added a few operators and such.
For constants and values in type properties we can either just
store the number on some obstack, or use LEB. The latter can
be nice since we can sometimes just use a pointer directly into
the DWARF data.
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From: tromey at sourceware dot org @ 2023-02-27 18:01 UTC (permalink / raw)
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--- Comment #17 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Tom Tromey from comment #16)
> Monday or so I'll push my WIP patch to add wide-int to the tree
> and you can see what it looks like
It is submit/wide-int-hacks in my github
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--- Comment #18 from Tom Tromey <tromey at sourceware dot org> ---
See also submit/pr-20991-more-gmp for the WIP.
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From: tromey at sourceware dot org @ 2023-03-01 21:51 UTC (permalink / raw)
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks|21185 |
Depends on| |21185
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=21185
[Bug 21185] add i128 and u128 support to rust lexer and parser
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From: tromey at sourceware dot org @ 2023-03-01 21:51 UTC (permalink / raw)
To: gdb-prs
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Bug 20991 depends on bug 21185, which changed state.
Bug 21185 Summary: add i128 and u128 support to rust lexer and parser
https://sourceware.org/bugzilla/show_bug.cgi?id=21185
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|DUPLICATE |---
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |19423
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=19423
[Bug 19423] __int128 conversion towards "const __int128 &" should be allowed
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |30188
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=30188
[Bug 30188] add 128-bit integer support to Ada lexer and parser
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |30189
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=30189
[Bug 30189] add 128-bit integer support to C lexer and parser
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |30190
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=30190
[Bug 30190] Allow 128-bit arithemetic on value
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2023-03-01 21:59 ` tromey at sourceware dot org
@ 2023-03-01 22:01 ` tromey at sourceware dot org
2023-03-01 22:01 ` [Bug exp/20991] [meta] " tromey at sourceware dot org
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From: tromey at sourceware dot org @ 2023-03-01 22:01 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |30191
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=30191
[Bug 30191] allow 128-bit types in properties
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2023-03-01 22:01 ` tromey at sourceware dot org
@ 2023-03-01 22:01 ` tromey at sourceware dot org
2023-03-27 14:26 ` tromey at sourceware dot org
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26 siblings, 0 replies; 27+ messages in thread
From: tromey at sourceware dot org @ 2023-03-01 22:01 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|__int128 type support |[meta] __int128 type
| |support
--- Comment #19 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Tom Tromey from comment #8)
> Also it seems like there are multiple parts to this bug.
> Perhaps we should treat them individually...
I filed new bugs and I'm turning this into a meta bug.
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2023-03-01 22:01 ` [Bug exp/20991] [meta] " tromey at sourceware dot org
@ 2023-03-27 14:26 ` tromey at sourceware dot org
2023-04-17 17:05 ` tromey at sourceware dot org
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From: tromey at sourceware dot org @ 2023-03-27 14:26 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Bug 20991 depends on bug 30190, which changed state.
Bug 30190 Summary: Allow 128-bit arithemetic on value
https://sourceware.org/bugzilla/show_bug.cgi?id=30190
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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2023-03-27 14:26 ` tromey at sourceware dot org
@ 2023-04-17 17:05 ` tromey at sourceware dot org
2023-04-17 17:05 ` tromey at sourceware dot org
2024-03-20 17:26 ` ssbssa at sourceware dot org
26 siblings, 0 replies; 27+ messages in thread
From: tromey at sourceware dot org @ 2023-04-17 17:05 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Bug 20991 depends on bug 21185, which changed state.
Bug 21185 Summary: add i128 and u128 support to rust lexer and parser
https://sourceware.org/bugzilla/show_bug.cgi?id=21185
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
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2023-04-17 17:05 ` tromey at sourceware dot org
@ 2023-04-17 17:05 ` tromey at sourceware dot org
2024-03-20 17:26 ` ssbssa at sourceware dot org
26 siblings, 0 replies; 27+ messages in thread
From: tromey at sourceware dot org @ 2023-04-17 17:05 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Bug 20991 depends on bug 30188, which changed state.
Bug 30188 Summary: add 128-bit integer support to Ada lexer and parser
https://sourceware.org/bugzilla/show_bug.cgi?id=30188
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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2023-04-17 17:05 ` tromey at sourceware dot org
@ 2024-03-20 17:26 ` ssbssa at sourceware dot org
26 siblings, 0 replies; 27+ messages in thread
From: ssbssa at sourceware dot org @ 2024-03-20 17:26 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=20991
Bug 20991 depends on bug 19423, which changed state.
Bug 19423 Summary: __int128 conversion towards "const __int128 &" should be allowed
https://sourceware.org/bugzilla/show_bug.cgi?id=19423
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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