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From: Richard Henderson <rth@twiddle.net>
To: Laurent Vivier <laurent@vivier.eu>, qemu-devel@nongnu.org
Cc: Aurelien Jarno <aurelien@aurel32.net>
Subject: Re: [Qemu-devel] [PATCH v3 14/16] target-m68k: add explicit single and double precision operations
Date: Thu, 16 Feb 2017 12:41:22 +1100	[thread overview]
Message-ID: <fb2f3f67-bc4d-ac83-68b9-28d85481e219@twiddle.net> (raw)
In-Reply-To: <20170207005930.28327-15-laurent@vivier.eu>

On 02/07/2017 11:59 AM, Laurent Vivier wrote:
> +    case 0: /* fmove */
> +        break;
> +    case 0x40: /* fsmove */
> +        gen_helper_redf32_FP0(cpu_env);
> +        gen_helper_extf32_FP0(cpu_env);
> +        break;
> +    case 0x44: /* fdmove */
> +        gen_helper_redf64_FP0(cpu_env);
> +        gen_helper_extf64_FP0(cpu_env);
>          break;

This is going to produce double-rounding errors.  Better to properly set the 
rounding precision first and convert once.


r~

  reply	other threads:[~2017-02-16  1:41 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-07  0:59 [Qemu-devel] [PATCH v3 00/16] target-m68k: implement 680x0 FPU Laurent Vivier
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 01/16] softfloat: define 680x0 specific values Laurent Vivier
2017-02-08 21:30   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 02/16] softloat: disable floatx80_invalid_encoding() for m68k Laurent Vivier
2017-02-08 21:32   ` Richard Henderson
2017-02-08 22:58   ` Peter Maydell
2017-02-09  8:07     ` Laurent Vivier
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 03/16] target-m68k: move FPU helpers to fpu_helper.c Laurent Vivier
2017-02-08 21:33   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 04/16] target-m68k: define ext_opsize Laurent Vivier
2017-02-08 21:33   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 05/16] target-m68k: use floatx80 internally Laurent Vivier
2017-02-15 22:59   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 06/16] target-m68k: add FPCR and FPSR Laurent Vivier
2017-02-16  1:10   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 07/16] target-m68k: manage FPU exceptions Laurent Vivier
2017-02-16  1:16   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 08/16] target-m68k: define 96bit FP registers for gdb on 680x0 Laurent Vivier
2017-02-16  1:17   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 09/16] target-m68k: add fmovem Laurent Vivier
2017-02-16  1:22   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 10/16] target-m68k: add fscc Laurent Vivier
2017-02-16  1:27   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 11/16] target-m68k: add fmovecr Laurent Vivier
2017-02-16  1:28   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 12/16] target-m68k: add fscale, fgetman, fgetexp and fmod Laurent Vivier
2017-02-16  1:34   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 13/16] target-m68k: add fsglmul and fsgldiv Laurent Vivier
2017-02-16  1:36   ` Richard Henderson
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 14/16] target-m68k: add explicit single and double precision operations Laurent Vivier
2017-02-16  1:41   ` Richard Henderson [this message]
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 15/16] target-m68k: add more FPU instructions Laurent Vivier
2017-02-16  1:46   ` Richard Henderson
2017-02-16 10:18     ` Andreas Schwab
2017-02-16 21:01       ` Richard Henderson
2017-02-17  9:06         ` Andreas Schwab
2017-02-07  0:59 ` [Qemu-devel] [PATCH v3 16/16] target-m68k: add fsincos Laurent Vivier
2017-02-07  1:25 ` [Qemu-devel] [PATCH v3 00/16] target-m68k: implement 680x0 FPU no-reply

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