Module Name: src
Committed By: matt
Date: Fri Aug 23 17:41:03 UTC 2013
Added Files:
src/lib/libc/quad: floatdisf_ieee754.c floatundisf_ieee754.c
Log Message:
Add IEEE 754 versions of __float{,}disf which use no floating point.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/lib/libc/quad/floatdisf_ieee754.c \
src/lib/libc/quad/floatundisf_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/quad/floatdisf_ieee754.c
diff -u /dev/null src/lib/libc/quad/floatdisf_ieee754.c:1.1
--- /dev/null Fri Aug 23 17:41:03 2013
+++ src/lib/libc/quad/floatdisf_ieee754.c Fri Aug 23 17:41:03 2013
@@ -0,0 +1,89 @@
+/* $NetBSD: floatdisf_ieee754.c,v 1.1 2013/08/23 17:41:03 matt Exp $ */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: floatdisf_ieee754.c,v 1.1 2013/08/23 17:41:03 matt Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
+#include "softfloat/softfloat-for-gcc.h"
+#endif
+
+#include <limits.h>
+#include <machine/ieee.h>
+#include "quad.h"
+
+float __floatdisf(quad_t);
+
+/*
+ * Convert signed quad to float.
+ */
+float
+__floatdisf(quad_t x)
+{
+ union ieee_single_u ux = { .sngu_f = 0.0 };
+
+ if (x == 0)
+ return 0.0;
+ if (x == 1)
+ return 1.0;
+
+ if (x < 0) {
+ if (x == QUAD_MIN)
+ return -0x1.0p63;
+ ux.sngu_sign = 1;
+ x = -x;
+ }
+#if defined(_LP64) || defined(__mips_n32)
+ u_int l = __builtin_clzll(x);
+ x <<= (l + 1); /* clear implicit bit */
+
+ ux.sngu_frac = (u_quad_t)x >> (64 - SNG_FRACBITS);
+#else
+ union uu u = { .q = x };
+ uint32_t frac;
+ if (u.ul[H] == 0) {
+ u_int l = __builtin_clz(u.ul[L]);
+ frac = u.ul[L] << (l + 1); /* clear implicit bit */
+ l += 32;
+ } else {
+ u_int l = __builtin_clz(u.ul[H]);
+ frac = u.ul[H] << (l + 1); /* clear implicit bit */
+ frac |= u.ul[L] >> (32 - (l + 1));
+ }
+
+ ux.sngu_frac = frac >> (32 - SNG_FRACBITS);
+#endif
+ ux.sngu_exp = SNG_EXP_BIAS + 63 - l;
+
+ return ux.sngu_f;
+}
Index: src/lib/libc/quad/floatundisf_ieee754.c
diff -u /dev/null src/lib/libc/quad/floatundisf_ieee754.c:1.1
--- /dev/null Fri Aug 23 17:41:03 2013
+++ src/lib/libc/quad/floatundisf_ieee754.c Fri Aug 23 17:41:03 2013
@@ -0,0 +1,82 @@
+/* $NetBSD: floatundisf_ieee754.c,v 1.1 2013/08/23 17:41:03 matt Exp $ */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: floatundisf_ieee754.c,v 1.1 2013/08/23 17:41:03 matt Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
+#include "softfloat/softfloat-for-gcc.h"
+#endif
+
+#include <machine/ieee.h>
+#include "quad.h"
+
+float __floatundisf(u_quad_t);
+
+/*
+ * Convert unsigned quad to float.
+ */
+float
+__floatundisf(u_quad_t x)
+{
+ union ieee_single_u ux = { .sngu_f = 0.0 };
+
+ if (x == 0)
+ return 0.0;
+ if (x == 1)
+ return 1.0;
+
+#if defined(_LP64) || defined(__mips_n32)
+ u_int l = __builtin_clzll(x);
+ x <<= (l + 1); /* clear implicit bit */
+
+ ux.sngu_frac = x >> (64 - SNG_FRACBITS);
+#else
+ union uu u = { .uq = x };
+ uint32_t frac;
+ if (u.ul[H] == 0) {
+ u_int l = __builtin_clz(u.ul[L]);
+ frac = u.ul[L] << (l + 1); /* clear implicit bit */
+ l += 32;
+ } else {
+ u_int l = __builtin_clz(u.ul[H]);
+ frac = u.ul[H] << (l + 1); /* clear implicit bit */
+ frac |= u.ul[L] >> (32 - (l + 1));
+ }
+
+ ux.sngu_frac = frac >> (32 - SNG_FRACBITS);
+#endif
+ ux.sngu_exp = SNG_EXP_BIAS + 63 - l;
+
+ return ux.sngu_f;
+}
