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Re: Calling conventions (particularly 32-bit ARM)

From Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups comp.arch
Subject Re: Calling conventions (particularly 32-bit ARM)
Date 2025-01-08 12:34 -0500
Organization A noiseless patient Spider
Message-ID <jwv34htql17.fsf-monnier+comp.arch@gnu.org> (permalink)
References <vlgngv$1ks4a$1@dont-email.me> <4903307dfcce354508c9fc016a4c1ea1@www.novabbs.org>

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> I looked high and low for codes using more than 8 arguments and
> returning aggregates larger than 8 double words, and about the
> only things I found were a handful of []print[]() calls.

For languages where the type systems ensures that the max number of
arguments is known (and the same) when compiling the function and when
compiling the calls to it, you could adjust the number of caller-saved
argument registers according to the actual number of arguments of the
function, thus making it "cheap" to allow, say, 13 argument registers
for those functions that take 13 arguments, since it doesn't impact the
other functions.

But in any case, I suspect there are also diminishing returns at some
point: how much faster is it in practice to pass/return 13 values in
registers instead of 8 of them in registers and the remaining 5 on
the stack?  I expect a 13-arg function to perform an amount
of work that will dwarf the extra work of going through the stack.


        Stefan

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Thread

Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-06 14:57 +0100
  Re: Calling conventions (particularly 32-bit ARM) Theo <theom+news@chiark.greenend.org.uk> - 2025-01-06 15:23 +0000
    Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-07 09:22 +0100
  Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-06 15:32 +0000
    Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-06 20:19 +0000
      Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-07 10:09 +0100
        Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-07 23:23 +0000
          Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-07 23:35 +0000
            Re: Calling conventions (particularly 32-bit ARM) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-01-07 15:42 -0800
              Re: Calling conventions (particularly 32-bit ARM) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-01-07 20:01 -0800
            Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-08 01:38 +0000
    Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-07 09:49 +0100
  Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-06 20:10 +0000
    Re: Calling conventions (particularly 32-bit ARM) antispam@fricas.org (Waldek Hebisch) - 2025-01-07 02:11 +0000
      Re: Calling conventions (particularly 32-bit ARM) Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-01-07 06:53 +0000
      Re: Calling conventions (particularly 32-bit ARM) Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-01-12 12:10 -0800
        Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-12 20:41 +0000
        Re: Calling conventions (particularly 32-bit ARM) antispam@fricas.org (Waldek Hebisch) - 2025-01-13 01:20 +0000
          Re: Calling conventions (particularly 32-bit ARM) Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-01-14 09:40 -0800
            Re: Calling conventions (particularly 32-bit ARM) Terje Mathisen <terje.mathisen@tmsw.no> - 2025-01-14 19:18 +0100
              Re: Calling conventions (particularly 32-bit ARM) Michael S <already5chosen@yahoo.com> - 2025-01-14 23:48 +0200
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 23:27 +0000
                Re: Calling conventions (particularly 32-bit ARM) John Levine <johnl@taugh.com> - 2025-01-15 03:31 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-15 16:50 +0000
                Re: Calling conventions (particularly 32-bit ARM) John Levine <johnl@taugh.com> - 2025-01-15 22:03 +0000
                Re: Calling conventions (particularly 32-bit ARM) antispam@fricas.org (Waldek Hebisch) - 2025-01-16 03:02 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-16 15:08 +0000
                Re: Calling conventions (particularly 32-bit ARM) antispam@fricas.org (Waldek Hebisch) - 2025-01-16 16:24 +0000
        Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-13 21:33 +0000
          Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-14 06:48 +0000
            Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 18:03 +0000
    Re: Calling conventions (particularly 32-bit ARM) George Neuner <gneuner2@comcast.net> - 2025-01-07 16:52 -0500
      Re: Calling conventions (particularly 32-bit ARM) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-01-08 12:20 -0500
        Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-09 08:38 +0000
          Re: Calling conventions (particularly 32-bit ARM) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-01-13 10:55 -0500
      Re: Calling conventions (particularly 32-bit ARM) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-27 17:09 -0800
        Re: Calling conventions (particularly 32-bit ARM) George Neuner <gneuner2@comcast.net> - 2025-01-28 22:53 -0500
          Re: Calling conventions (particularly 32-bit ARM) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-02-14 20:40 -0800
            Re: Calling conventions (particularly 32-bit ARM) George Neuner <gneuner2@comcast.net> - 2026-02-17 15:35 -0500
              Re: Calling conventions (particularly 32-bit ARM) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-03-14 09:34 -0700
                Re: Calling conventions (particularly 32-bit ARM) George Neuner <gneuner2@comcast.net> - 2026-03-24 17:20 -0400
    Re: Calling conventions (particularly 32-bit ARM) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-01-08 12:34 -0500
      Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-08 20:19 +0000
      Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-08 22:08 +0000
        Re: Calling conventions (particularly 32-bit ARM) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-01-08 18:20 -0500
          Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-09 00:11 +0000
          Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-09 07:23 +0000
            Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-09 10:07 +0000
              Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-10 08:24 +0000
            Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-09 20:48 +0000
              Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-09 21:23 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-10 01:08 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-10 09:19 +0000
            Re: Calling conventions (particularly 32-bit ARM) antispam@fricas.org (Waldek Hebisch) - 2025-01-10 08:33 +0000
              Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-10 10:25 +0000
                Re: Calling conventions (particularly 32-bit ARM) John Levine <johnl@taugh.com> - 2025-01-10 15:17 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-13 02:10 +0000
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-13 14:19 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-13 18:02 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-13 19:00 +0000
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-13 21:53 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-13 22:02 +0000
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-13 22:40 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 02:32 +0000
                Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-14 15:08 +0100
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 14:22 +0000
                Re: Calling conventions (particularly 32-bit ARM) Michael S <already5chosen@yahoo.com> - 2025-01-14 16:41 +0200
                Re: Calling conventions (particularly 32-bit ARM) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-01-14 18:02 +0000
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 18:15 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-14 18:19 +0000
                Re: Calling conventions (particularly 32-bit ARM) Terje Mathisen <terje.mathisen@tmsw.no> - 2025-01-14 19:39 +0100
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 19:14 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-14 20:01 +0000
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 22:05 +0000
                Re: Calling conventions (particularly 32-bit ARM) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-14 15:23 -0800
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 23:39 +0000
                Re: Calling conventions (particularly 32-bit ARM) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-14 16:59 -0800
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 23:40 +0000
                Re: Calling conventions (particularly 32-bit ARM) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-14 17:11 -0800
                Re: Calling conventions (particularly 32-bit ARM) Michael S <already5chosen@yahoo.com> - 2025-01-15 00:09 +0200
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-14 19:08 +0000
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 19:24 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-14 20:31 +0000
                Re: Calling conventions (particularly 32-bit ARM) Michael S <already5chosen@yahoo.com> - 2025-01-14 23:13 +0200
                Re: Calling conventions (particularly 32-bit ARM) mitchalsup@aol.com (MitchAlsup1) - 2025-01-15 00:47 +0000
                Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-14 06:20 +0000
                Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-14 15:05 +0100
                Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-14 14:39 +0000
                Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-14 16:50 +0100
                Re: Calling conventions (particularly 32-bit ARM) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-14 15:32 -0800
                Re: Calling conventions (particularly 32-bit ARM) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-14 00:14 -0800
              Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-10 14:43 +0000
            Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-10 18:39 +0100
              Re: Calling conventions (particularly 32-bit ARM) scott@slp53.sl.home (Scott Lurndal) - 2025-01-10 18:39 +0000
                Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-12 14:55 +0100
              Re: Calling conventions (particularly 32-bit ARM) Thomas Koenig <tkoenig@netcologne.de> - 2025-01-10 19:19 +0000
                Re: Calling conventions (particularly 32-bit ARM) David Brown <david.brown@hesbynett.no> - 2025-01-12 14:59 +0100

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