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Re: PATCH: Use __builtin_clzll in 64-bit __logb


On Friday, May 11, 2012 14:22:04 H.J. Lu wrote:
> Hi,
> 
> X32 uses 64-bit math function.  But its long is 32bit.  64-bit __logb
> should use __builtin_clzll instead of __builtin_clzl.  Testd on
> Linux/x32 and Linux/x86-64.  OK to install?

If this was tested on both x86-64 and x86, it's ok to commit.

Andreas

> Thanks.
> 
> H.J.
> ---
> 	* sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c (__logb): Replace
> 	__builtin_clzl with __builtin_clzll.
> 
> diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
> b/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c index 474eeef..185dd05
> 100644
> --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
> +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
> @@ -36,7 +36,7 @@ __logb (double x)
>      return x * x;
>    if (__builtin_expect (ex == 0, 0))
>      {
> -      int m = (ix == 0) ? 0 : __builtin_clzl (ix);
> +      int m = (ix == 0) ? 0 : __builtin_clzll (ix);
>        return -1022.0 + (double)(11 -m);
>      }
>    return (double) (ex - 1023);

-- 
 Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
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