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authormike <mike@FreeBSD.org>2003-02-08 20:37:55 +0000
committermike <mike@FreeBSD.org>2003-02-08 20:37:55 +0000
commitb4e3f2f94a505c800e895764e429ec9ec310d9b4 (patch)
tree5fa8c1927e480809720c766a3f48569e33c80af9 /lib/libc/include
parent9c57bdd382a4547a47c07bb50cb31b20e614f0c9 (diff)
downloadFreeBSD-src-b4e3f2f94a505c800e895764e429ec9ec310d9b4.zip
FreeBSD-src-b4e3f2f94a505c800e895764e429ec9ec310d9b4.tar.gz
Implement fpclassify():
o Add a MD header private to libc called _fpmath.h; this header contains bitfield layouts of MD floating-point types. o Add a MI header private to libc called fpmath.h; this header contains bitfield layouts of MI floating-point types. o Add private libc variables to lib/libc/$arch/gen/infinity.c for storing NaN values. o Add __double_t and __float_t to <machine/_types.h>, and provide double_t and float_t typedefs in <math.h>. o Add some C99 manifest constants (FP_ILOGB0, FP_ILOGBNAN, HUGE_VALF, HUGE_VALL, INFINITY, NAN, and return values for fpclassify()) to <math.h> and others (FLT_EVAL_METHOD, DECIMAL_DIG) to <float.h> via <machine/float.h>. o Add C99 macro fpclassify() which calls __fpclassify{d,f,l}() based on the size of its argument. __fpclassifyl() is never called on alpha because (sizeof(long double) == sizeof(double)), which is good since __fpclassifyl() can't deal with such a small `long double'. This was developed by David Schultz and myself with input from bde and fenner. PR: 23103 Submitted by: David Schultz <dschultz@uclink.Berkeley.EDU> (significant portions) Reviewed by: bde, fenner (earlier versions)
Diffstat (limited to 'lib/libc/include')
-rw-r--r--lib/libc/include/fpmath.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/libc/include/fpmath.h b/lib/libc/include/fpmath.h
new file mode 100644
index 0000000..fcfbbcf
--- /dev/null
+++ b/lib/libc/include/fpmath.h
@@ -0,0 +1,63 @@
+/*-
+ * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
+ * Copyright (c) 2002 David Schultz <dschultz@uclink.Berkeley.EDU>
+ * 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 AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/endian.h>
+#include "_fpmath.h"
+
+union IEEEf2bits {
+ float f;
+ struct {
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+ unsigned int man :23;
+ unsigned int exp :8;
+ unsigned int sign :1;
+#else /* _BIG_ENDIAN */
+ unsigned int sign :1;
+ unsigned int exp :8;
+ unsigned int man :23;
+#endif
+ } bits;
+};
+
+union IEEEd2bits {
+ double d;
+ struct {
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+ unsigned int manl :32;
+ unsigned int manh :20;
+ unsigned int exp :11;
+ unsigned int sign :1;
+#else /* _BIG_ENDIAN */
+ unsigned int sign :1;
+ unsigned int exp :11;
+ unsigned int manh :20;
+ unsigned int manl :32;
+#endif
+ } bits;
+};
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