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-rw-r--r--sysdeps/powerpc/q_dtoq.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/powerpc/q_dtoq.c b/sysdeps/powerpc/q_dtoq.c
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+++ b/sysdeps/powerpc/q_dtoq.c
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+/* 64-bit floating point to 128-bit floating point.
+ 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 <quad_float.h>
+
+/* long double _q_dtoq(double a);
+ Convert 'a' to long double. Don't raise exceptions.
+ */
+
+void
+__q_dtoq(unsigned long long result[2], double a)
+{
+ unsigned ux, rx;
+ union {
+ double d;
+ unsigned long long u;
+ } u;
+
+ u.d = a;
+ result[1] = u.u << 64-4;
+ result[0] = u.u >> 4;
+ /* correct exponent bias */
+ rx = ((long long)u.u >> 52 & 0x87ff) + 16383-1023;
+
+ ux = u.u >> 52 & 0x7ff;
+ if (ux == 0)
+ {
+ if ((u.u & 0x7fffffffffffffffULL) == 0)
+ {
+ /* +0.0 or -0.0. */
+ rx &= 0x8000;
+ }
+ else
+ {
+ /* Denormalised number. Renormalise. */
+ unsigned long long um = u.u & 0x000fffffffffffffULL;
+ int cs = cntlzd(um) - 12 + 1;
+ rx -= cs;
+ um <<= cs;
+ result[0] = um >> 4;
+ result[1] = um << 64-4;
+ }
+ }
+ else if (ux == 0x7ff)
+ {
+ /* Inf or NaN. */
+ rx |= 0x7fff;
+ }
+ *(unsigned short *)result = rx;
+}