git: fd860ace3bde - main - Remove the DN flag from the initial arm64 fpcr value

[Andrew Turner]

I found it with the lldb test suite. I also checked the value Mac and Linux initialised the register to & found it to be zero.

Andrew

> On 14 Sep 2021, at 14:42, Ronald Klop <ronald-lists at klop.ws> wrote:
> 
> Hi,
> 
> Do you have an example of this software? Just for my understanding.
> 
> Ronald.
> 
> Van: Andrew Turner <andrew at FreeBSD.org>
> Datum: dinsdag, 14 september 2021 14:53
> Aan: src-committers at FreeBSD.org, dev-commits-src-all at FreeBSD.org, dev-commits-src-main at FreeBSD.org
> Onderwerp: git: fd860ace3bde - main - Remove the DN flag from the initial arm64 fpcr value
> 
> The branch main has been updated by andrew:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=fd860ace3bded96bee0e5c090a5a4d8b085b700c <https://cgit.freebsd.org/src/commit/?id=fd860ace3bded96bee0e5c090a5a4d8b085b700c>
> 
> commit fd860ace3bded96bee0e5c090a5a4d8b085b700c
> Author:     Andrew Turner <andrew at FreeBSD.org>
> AuthorDate: 2021-08-25 10:05:55 +0000
> Commit:     Andrew Turner <andrew at FreeBSD.org>
> CommitDate: 2021-09-14 12:52:48 +0000
> 
>     Remove the DN flag from the initial arm64 fpcr value
>     
>     This fixes software that expects NaN values to propagate.
>     
>     Sponsored by:   The FreeBSD Foundation
> ---
>  sys/arm64/include/vfp.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sys/arm64/include/vfp.h b/sys/arm64/include/vfp.h
> index 629b1b7fadf4..bee0121d9d2a 100644
> --- a/sys/arm64/include/vfp.h
> +++ b/sys/arm64/include/vfp.h
> @@ -35,7 +35,7 @@
>  #define    VFPCR_AHP       (0x04000000)    /* alt. half-precision: */
>  #define    VFPCR_DN        (0x02000000)    /* default NaN enable */
>  #define    VFPCR_FZ        (0x01000000)    /* flush to zero enabled */
> -#define    VFPCR_INIT      VFPCR_DN    /* Default fpcr after exec */
> +#define    VFPCR_INIT      0       /* Default fpcr after exec */
>  
>  #define    VFPCR_RMODE_OFF     22      /* rounding mode offset */
>  #define    VFPCR_RMODE_MASK    (0x00c00000)    /* rounding mode mask */
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