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Re: Fix ldbl-128ibm acoshl inaccuracy (bug 16384)
- From: Andreas Jaeger <aj at suse dot com>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>, libc-alpha at sourceware dot org
- Cc: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
- Date: Thu, 02 Jan 2014 09:19:26 +0100
- Subject: Re: Fix ldbl-128ibm acoshl inaccuracy (bug 16384)
- Authentication-results: sourceware.org; auth=none
- References: <Pine dot LNX dot 4 dot 64 dot 1401011837290 dot 27585 at digraph dot polyomino dot org dot uk>
On 01/01/2014 07:40 PM, Joseph S. Myers wrote:
> This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which
> showed up while attempting to regenerate ulps for powerpc-nofpu for
> 2.19. There were two separate problems, use of __log1p instead of
> __log1pl and an insufficiently accurate constant value for log 2
> (which this patch replaces by use of M_LN2l), each of which could
> cause substantial inaccuracy in affected cases.
>
> Tested for powerpc-nofpu.
Thanks,
Andreas
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