[Bug target/47989] -mrecip causes 482.sphinx3, 464.h264ref and 481.wrf to miscompare

[uros at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47989

--- Comment #4 from uros at gcc dot gnu.org 2011-10-20 15:13:39 UTC ---
Author: uros
Date: Thu Oct 20 15:13:30 2011
New Revision: 180256

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180256
Log:
    PR target/47989
    * config/i386/i386.h (RECIP_MASK_DEFAULT): New define.
    * config/i386/i386.op (recip_mask): Initialize with RECIP_MASK_DEFAULT.
    * doc/invoke.texi (ix86 Options, -mrecip): Document that GCC
    implements vectorized single float division and vectorized sqrtf(x)
    with reciprocal sequence with additional Newton-Raphson step with
    -ffast-math.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.h
    trunk/gcc/config/i386/i386.opt
    trunk/gcc/doc/invoke.texi