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feholdexcept. * sysdeps/alpha/fpu/feholdexcpt.c: Add libm_hidden_def. * sysdeps/alpha/fpu/fesetround.c: Likewise. * sysdeps/generic/feholdexcpt.c: Likewise. * sysdeps/generic/fesetround.c: Likewise. * sysdeps/i386/fpu/feholdexcpt.c: Likewise. * sysdeps/i386/fpu/fesetround.c: Likewise. * sysdeps/ia64/fpu/feholdexcpt.c: Likewise. * sysdeps/ia64/fpu/fesetround.c: Likewise. * sysdeps/powerpc/fpu/feholdexcpt.c: Likewise. * sysdeps/powerpc/fpu/fesetround.c: Likewise. * sysdeps/s390/fpu/feholdexcpt.c: Likewise. * sysdeps/s390/fpu/fesetround.c: Likewise. * sysdeps/sh/sh4/fpu/feholdexcpt.c: Likewise. * sysdeps/sh/sh4/fpu/fesetround.c: Likewise. * sysdeps/sparc/fpu/feholdexcpt.c: Likewise. * sysdeps/sparc/fpu/fesetround.c: Likewise. * sysdeps/x86_64/fpu/feholdexcpt.c: Likewise. * sysdeps/x86_64/fpu/fesetround.c: Likewise. * sysdeps/generic/s_significand.c (__significand): Use __ilogb not ilogb. * sysdeps/generic/s_significandf.c (__significandf): Use __ilogbf not ilogbf.
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* Set current rounding direction.
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Copyright (C) 2001, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <fenv.h>
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int
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fesetround (int round)
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{
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unsigned short int cw;
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int mxcsr;
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if ((round & ~0xc00) != 0)
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/* ROUND is no valid rounding mode. */
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return 1;
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/* First set the x87 FPU. */
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asm ("fnstcw %0" : "=m" (*&cw));
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cw &= ~0xc00;
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cw |= round;
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asm ("fldcw %0" : : "m" (*&cw));
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/* And now the MSCSR register for SSE, the precision is at different bit
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positions in the different units, we need to shift it 3 bits. */
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asm ("stmxcsr %0" : "=m" (*&mxcsr));
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mxcsr &= ~ 0x6000;
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mxcsr |= round << 3;
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asm ("ldmxcsr %0" : : "m" (*&mxcsr));
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return 0;
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}
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libm_hidden_def (fesetround)
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