Module Name: src
Committed By: joerg
Date: Thu Jan 30 15:06:19 UTC 2014
Added Files:
src/lib/libc/gen: floatunditf_ieee754.c
Log Message:
Provide a simple floatunditf implementation, at least mips64 needs one.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/lib/libc/gen/floatunditf_ieee754.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/lib/libc/gen/floatunditf_ieee754.c
diff -u /dev/null src/lib/libc/gen/floatunditf_ieee754.c:1.1
--- /dev/null Thu Jan 30 15:06:19 2014
+++ src/lib/libc/gen/floatunditf_ieee754.c Thu Jan 30 15:06:18 2014
@@ -0,0 +1,81 @@
+/* $NetBSD: floatunditf_ieee754.c,v 1.1 2014/01/30 15:06:18 joerg Exp $ */
+
+/*-
+ * Copyright (c) 2014 Joerg Sonnenberger <[email protected]>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: floatunditf_ieee754.c,v 1.1 2014/01/30 15:06:18 joerg Exp $");
+
+#include <math.h>
+#include <machine/ieee.h>
+#include <limits.h>
+
+#ifdef __HAVE_LONG_DOUBLE
+
+long double __floatunditf(uint64_t x);
+
+/*
+ * Convert uint64_t to long double.
+ */
+long double
+__floatunditf(uint64_t x)
+{
+ int exponent, zeros;
+ union ieee_ext_u ux;
+
+ /* Use the easier conversion routine for uint32_t if possible. */
+ if (x <= UINT32_MAX)
+ return (long double)(uint32_t)x;
+
+ zeros = __builtin_clzll(x);
+#ifdef LDBL_IMPLICIT_NBIT
+ exponent = 64 - zeros;
+ x <<= zeros + 1;
+#else
+ exponent = 63 - zeros;
+ x <<= zeros;
+#endif
+
+ ux.extu_exp = EXT_EXP_BIAS + exponent;
+ ux.extu_frach = (x >> (64 - EXT_FRACHBITS));
+ x <<= EXT_FRACHBITS;
+#ifdef EXT_FRACHMBITS
+ ux.extu_frachm = (x >> (64 - EXT_FRACHMBITS));
+ x <<= EXT_FRACHMBITS;
+#endif
+#ifdef EXT_FRACLMBITS
+ ux.extu_fraclm = (x >> (64 - EXT_FRACLMBITS));
+ x <<= EXT_FRACLMBITS;
+#endif
+ ux.extu_fracl = (x >> (64 - EXT_FRACLBITS));
+ ux.extu_sign = 0;
+
+ return ux.extu_ld;
+}
+#endif /* __HAVE_LONG_DOUBLE */
