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From: David Laight <[email protected]>
To: 'Alviro Iskandar Setiawan' <[email protected]>
Cc: Willy Tarreau <[email protected]>, Ammar Faizi <[email protected]>,
	"Paul E. McKenney" <[email protected]>,
	Nugraha <[email protected]>,
	"Linux Kernel Mailing List" <[email protected]>,
	GNU/Weeb Mailing List <[email protected]>,
	"[email protected]" <[email protected]>,
	"[email protected]" <[email protected]>
Subject: RE: [RFC PATCH v2 3/8] tools/nolibc: i386: Implement syscall with 6 arguments
Date: Tue, 22 Mar 2022 15:11:23 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAOG64qP=Hn+Z6zO2pEafE4acLiGig79OCPQCAktb4bhV6DFBAg@mail.gmail.com>

From: Alviro Iskandar Setiawan
> Sent: 22 March 2022 14:48
> 
> On Tue, Mar 22, 2022 at 8:37 PM David Laight wrote:
> > dunno, 'asm' register variables are rather more horrid and
> > should probably only be used (for asm statements) when there aren't
> > suitable register constraints.
> >
> > (I'm sure there is a comment about that in the gcc docs.)
> 
> I don't find the comment that says so here:
> https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html

I've probably inferred it from:
    "The only supported use for this feature is to specify registers for
    input and output operands when calling Extended asm (see Extended Asm).
    This may be necessary if the constraints for a particular machine don’t
    provide sufficient control to select the desired register."

Here is isn't necessary because the required constraint exist/

	David

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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  reply	other threads:[~2022-03-22 15:11 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-22 10:21 [RFC PATCH v2 0/8] Add dynamic memory allocator support for nolibc Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 1/8] tools/nolibc: x86-64: Update System V ABI document link Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 2/8] tools/nolibc: Remove .global _start from the entry point code Ammar Faizi
2022-03-22 17:09   ` Nick Desaulniers
2022-03-22 17:25     ` Willy Tarreau
2022-03-22 17:30       ` Nick Desaulniers
2022-03-22 17:58         ` Willy Tarreau
2022-03-22 18:07           ` Nick Desaulniers
2022-03-22 18:24             ` Willy Tarreau
2022-03-22 18:38               ` Nick Desaulniers
2022-03-22 10:21 ` [RFC PATCH v2 3/8] tools/nolibc: i386: Implement syscall with 6 arguments Ammar Faizi
2022-03-22 10:57   ` David Laight
2022-03-22 11:23     ` Willy Tarreau
2022-03-22 11:39   ` David Laight
2022-03-22 12:02     ` Ammar Faizi
2022-03-22 12:07       ` Ammar Faizi
2022-03-22 12:13       ` Willy Tarreau
2022-03-22 13:26         ` Ammar Faizi
2022-03-22 13:34           ` Willy Tarreau
2022-03-22 13:37             ` Ammar Faizi
2022-03-22 13:39               ` David Laight
2022-03-22 13:41                 ` Willy Tarreau
2022-03-22 13:45                   ` Ammar Faizi
2022-03-22 13:54                     ` Ammar Faizi
2022-03-22 13:56                       ` Ammar Faizi
2022-03-22 14:02                         ` Willy Tarreau
2022-03-22 13:37         ` David Laight
2022-03-22 14:47           ` Alviro Iskandar Setiawan
2022-03-22 15:11             ` David Laight [this message]
2022-03-23  6:29           ` Ammar Faizi
2022-03-23  6:32             ` Ammar Faizi
2022-03-23  7:10             ` Willy Tarreau
2022-03-22 10:21 ` [RFC PATCH v2 4/8] tools/nolibc/sys: Implement `mmap()` and `munmap()` Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 5/8] tools/nolibc/types: Implement `offsetof()` and `container_of()` macro Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 6/8] tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()` Ammar Faizi
2022-03-22 11:52   ` David Laight
2022-03-22 12:18     ` Ammar Faizi
2022-03-22 12:36       ` Alviro Iskandar Setiawan
2022-03-22 12:42         ` Ammar Faizi
2022-03-22 12:21     ` Willy Tarreau
2022-03-22 10:21 ` [RFC PATCH v2 7/8] tools/nolibc/string: Implement `strnlen()` Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 8/8] tools/include/string: Implement `strdup()` and `strndup()` Ammar Faizi
2022-03-22 11:27 ` [RFC PATCH v2 0/8] Add dynamic memory allocator support for nolibc Willy Tarreau
2022-03-22 12:43   ` Ammar Faizi

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