aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/powerpc/q_fne.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/powerpc/q_fne.c')
-rw-r--r--sysdeps/powerpc/q_fne.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/sysdeps/powerpc/q_fne.c b/sysdeps/powerpc/q_fne.c
new file mode 100644
index 0000000000..8f6429cd55
--- /dev/null
+++ b/sysdeps/powerpc/q_fne.c
@@ -0,0 +1,70 @@
+/* 128-bit floating point unordered not-equality.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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 <fenv_libc.h>
+
+/* int _q_fne(const long double *a, const long double *b);
+ Returns 0 if a==b
+
+ Special cases:
+ NaNs return 1 always;
+ -0 == +0;
+ If either argument is a SNaN, we set FPSCR_VXSNAN to cause an
+ 'invalid operation' exception.
+ */
+
+int
+__q_fne(const unsigned a[4], const unsigned b[4])
+{
+ unsigned a0, b0;
+
+ a0 = a[0]; b0 = b[0];
+
+ if ((a0 >> 16 & 0x7fff) != 0x7fff &&
+ (b0 >> 16 & 0x7fff) != 0x7fff)
+ {
+ unsigned a3,b3,a2,b2,a1,b1;
+ unsigned z, result;
+
+ a3 = a[3]; b3 = b[3]; a2 = a[2];
+ result = a3 ^ b3;
+ b2 = b[2];
+ if (result != 0)
+ return result;
+ a1 = a[1]; b1 = b[1];
+ result = a2 ^ b2;
+ result |= a1 ^ b1;
+ z = a3 | a2;
+ if (result != 0)
+ return result;
+ z |= a1;
+ z = (z >> 1 | z | a0) & 0x7fffffff;
+ /* 'z' is 0 iff a==0.0, otherwise between 1 and 0x7fffffff */
+ return (a0^b0) & ~(-z & 0x80000000);
+ }
+ else
+ {
+ /* Deal with SNaNs */
+ if (((a0|b0) & 0x8000) == 0)
+ {
+ set_fpscr_bit(FPSCR_VXSNAN);
+ }
+ return 1;
+ }
+}