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The following reply was made to PR lib/44057; it has been noted by GNATS.
From: Taylor R Campbell <campbell+netbsd%mumble.net@localhost>
Subject: Re: lib/44057
Date: Fri, 15 Apr 2011 17:04:10 +0000
The problem is that GCC has distributed x*(one + x) = x + (x*x) in the
definition of tanh in src/lib/libm/src/s_tanh.c, as revealed by
I suspect that GCC fixed this in SVN revision 152443 by adding the
following fragment to the top of distribute_and_simplify_rtx in
if (FLOAT_MODE_P (GET_MODE (x))
&& ! flag_unsafe_math_optimizations)
I don't have the resources to test this hypothesis right now, though.
I imagine that if this fixes the problem, it is safe to back-port to
whatever version of GCC we are using; the surrounding code looks
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