From: Andreas Schwab <schwab@linux-m68k.org>
To: Laurent Vivier <laurent@vivier.eu>
Cc: qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v2 00/16] target-m68k: implement 680x0 FPU
Date: Mon, 30 Jan 2017 19:44:12 +0100 [thread overview]
Message-ID: <8737g09ymb.fsf@linux-m68k.org> (raw)
In-Reply-To: <20170130181634.13934-1-laurent@vivier.eu> (Laurent Vivier's message of "Mon, 30 Jan 2017 19:16:18 +0100")
On Jan 30 2017, Laurent Vivier <laurent@vivier.eu> wrote:
> The floatx80 datatype used here is not exactly the same as the
> one used by 680x0 for its extended precision data type, because
> normally the signaling bit of 680x0 NAN is the MSB of the mantissa
> minus one and in floatx80 it is the MSB.
An Intel Extended also has a different exponent bias than a Motorola
Extended in the denormal range. In other words, for the latter the bias
doesn't change between normal and denormal numbers.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2017-01-30 18:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-30 18:16 [Qemu-devel] [PATCH v2 00/16] target-m68k: implement 680x0 FPU Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 01/16] softfloat: define 680x0 specific values Laurent Vivier
2017-01-30 19:19 ` Peter Maydell
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 02/16] softloat: disable floatx80_invalid_encoding() for m68k Laurent Vivier
2017-01-30 19:15 ` Peter Maydell
2017-01-30 22:47 ` Andreas Schwab
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 03/16] target-m68k: move FPU helpers to fpu_helper.c Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 04/16] target-m68k: define ext_opsize Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 05/16] target-m68k: use floatx80 internally Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 06/16] target-m68k: add FPCR and FPSR Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 07/16] target-m68k: manage FPU exceptions Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 08/16] target-m68k: define 96bit FP registers for gdb on 680x0 Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 09/16] target-m68k: add fmovem Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 10/16] target-m68k: add fscc Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 11/16] target-m68k: add fmovecr Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 12/16] target-m68k: add fscale, fgetman, fgetexp and fmod Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 13/16] target-m68k: add fsglmul and fsgldiv Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 14/16] target-m68k: add explicit single and double precision operations Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 15/16] target-m68k: add more FPU instructions Laurent Vivier
2017-01-30 18:16 ` [Qemu-devel] [PATCH v2 16/16] target-m68k: add fsincos Laurent Vivier
2017-01-30 18:44 ` Andreas Schwab [this message]
2017-01-30 18:47 ` [Qemu-devel] [PATCH v2 00/16] target-m68k: implement 680x0 FPU no-reply
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