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authorRichard Henderson <rth@redhat.com>2000-03-20 20:32:11 +0000
committerRichard Henderson <rth@redhat.com>2000-03-20 20:32:11 +0000
commit9dc874df52f8e7d251e4684cefe95320c31074fd (patch)
treee8f8c0174e4f00b203efaaa41d40f1852304d2d6 /sysdeps/alpha/fpu/s_rintf.c
parentcd112ac0a347fe08ba42273a365b5471d3dfca88 (diff)
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* sysdeps/alpha/fpu/fraiseexcpt.c: Use get/set_fp_control instead
of arithmetic instructions. * sysdeps/alpha/fpu/s_ceil.c: Use round to -inf instead of playing with the fpcr. Protect from INV exception. * sysdeps/alpha/fpu/s_ceilf.c: Likewise. * sysdeps/alpha/fpu/s_floor.c: Protect from INV exception. * sysdeps/alpha/fpu/s_floorf.c: Likewise. * sysdeps/alpha/fpu/s_copysign.c: New. * sysdeps/alpha/fpu/s_copysignf.c: New. * sysdeps/alpha/fpu/s_fabs.c: New. * sysdeps/alpha/fpu/s_fabsf.c: New. * sysdeps/alpha/fpu/s_rint.c: New. * sysdeps/alpha/fpu/s_rintf.c: New.
Diffstat (limited to 'sysdeps/alpha/fpu/s_rintf.c')
-rw-r--r--sysdeps/alpha/fpu/s_rintf.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/alpha/fpu/s_rintf.c b/sysdeps/alpha/fpu/s_rintf.c
new file mode 100644
index 0000000000..044f7e5f7a
--- /dev/null
+++ b/sysdeps/alpha/fpu/s_rintf.c
@@ -0,0 +1,52 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Richard Henderson.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <math.h>
+
+
+float
+__rintf (float x)
+{
+ if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
+ {
+ /* Note that Alpha S_Floating is stored in registers in a
+ restricted T_Floating format, so we don't even need to
+ convert back to S_Floating in the end. The initial
+ conversion to T_Floating is needed to handle denormals. */
+
+ float tmp1, tmp2, new_x;
+
+ __asm ("cvtst/s %3,%2\n\t"
+#ifdef _IEEE_FP_INEXACT
+ "cvttq/svid %2,%1\n\t"
+#else
+ "cvttq/svd %2,%1\n\t"
+#endif
+ "cvtqt/d %1,%0\n\t"
+ : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
+ : "f"(x));
+
+ /* rint(-0.1) == -0, and in general we'll always have the same
+ sign as our input. */
+ x = copysignf(new_x, x);
+ }
+ return x;
+}
+
+weak_alias (__rintf, rintf)