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[PATCH, libfortran]: Committed: Read rounding mode from SSE mxcsr register on x86_64.

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Fortran List <fortran at gcc dot gnu dot org>, Tobias Burnus <burnus at net-b dot de>
Date: Tue, 23 Jul 2013 11:55:24 +0200
Subject: [PATCH, libfortran]: Committed: Read rounding mode from SSE mxcsr register on x86_64.

Hello!

On x86_64, we can look into SSE mxcsr register to determine rounding mode.


2013-07-23  Uros Bizjak  <ubizjak@gmail.com>

    * config/fpu-387.h (get_fpu_rounding_mode): Read rounding mode
    from SSE mxcsr register on x86_64.

Tested on x86_64-pc-linux-gnu {,-m32}  and committed to mainline svn.

BTW. gfortran.dg/round_4.f90 test will fail on glibc < 2.17 due to
glibc bug 3479 [1], "Incorrect rounding in strtod()".

[1] http://sourceware.org/bugzilla/show_bug.cgi?id=3479

Uros.

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