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Re: Fix spurious "inexact" exceptions from dbl-64 sqrt (bug 15631)
- From: Andreas Jaeger <aj at suse dot com>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>
- Cc: libc-alpha at sourceware dot org
- Date: Sat, 15 Jun 2013 21:29:01 +0200
- Subject: Re: Fix spurious "inexact" exceptions from dbl-64 sqrt (bug 15631)
- References: <Pine dot LNX dot 4 dot 64 dot 1306142108540 dot 4414 at digraph dot polyomino dot org dot uk>
On 06/14/2013 11:12 PM, Joseph S. Myers wrote:
Bug 15631 is spurious "inexact" exceptions from the dbl-64 sqrt
implementation, which show up as testsuite failures for architectures
not using hardware square root instructions. This patch fixes these
by saving and restoring exception state, which then requires an
explicit check for whether the computed result is the exact square
root so "inexact" can be raised when required. Tested MIPS64 (n32
ABI). (MIPS is in fact an architecture that*should* be using
hardware square root instructions, but as a result of sysdeps
directory ordering it isn't at present; I've filed bug 15632 for
that.)
ok, thanks,
Andreas
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