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Add a barrier in the double fma implementation.

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Aurelien Jarno 2012-06-01 19:01:17 +00:00 committed by Joseph Myers
parent 29bcce7ce4
commit efb734887e
2 changed files with 8 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2012-06-01 Aurelien Jarno <aurelien@aurel32.net>
* sysdeps/ieee754/dbl-64/s_fma.c (__fma): Ensure a1 + u.d
computation is not scheduled after fetestexcept.
2012-06-01 H.J. Lu <hongjiu.lu@intel.com> 2012-06-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #14117] [BZ #14117]

4
sysdeps/ieee754/dbl-64/s_fma.c
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@ -1,5 +1,5 @@
/* Compute x * y + z as ternary operation. /* Compute x * y + z as ternary operation.
Copyright (C) 2010, 2011 Free Software Foundation, Inc. Copyright (C) 2010-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2010. Contributed by Jakub Jelinek <jakub@redhat.com>, 2010.
@ -158,6 +158,8 @@ __fma (double x, double y, double z)
if ((u.ieee.mantissa1 & 1) == 0) if ((u.ieee.mantissa1 & 1) == 0)
u.ieee.mantissa1 |= libc_fetestexcept (FE_INEXACT) != 0; u.ieee.mantissa1 |= libc_fetestexcept (FE_INEXACT) != 0;
v.d = a1 + u.d; v.d = a1 + u.d;
/* Ensure the addition is not scheduled after fetestexcept call. */
math_force_eval (v.d);
} }
/* Reset rounding mode and test for inexact simultaneously. */ /* Reset rounding mode and test for inexact simultaneously. */