libm: Add nanf() and tgammaf() implementations.
Requested by b/3370708 to export these through RenderScript.
Change-Id: I1ae69f87a1ad4765b2dee8e4a6f2f3a6eb7c5ad4
diff --git a/libm/Android.mk b/libm/Android.mk
index 28e8f33..29c75a2 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -117,6 +117,7 @@
src/s_lroundf.c \
src/s_lroundl.c \
src/s_modff.c \
+ src/s_nan.c \
src/s_nearbyint.c \
src/s_nextafter.c \
src/s_nextafterf.c \
@@ -138,6 +139,7 @@
src/s_tanf.c \
src/s_tanh.c \
src/s_tanhf.c \
+ src/s_tgammaf.c \
src/s_trunc.c \
src/s_truncf.c \
src/s_truncl.c \
diff --git a/libm/include/math.h b/libm/include/math.h
index 3b5660f..a86a16f 100644
--- a/libm/include/math.h
+++ b/libm/include/math.h
@@ -251,6 +251,7 @@
double logb(double);
long lrint(double);
long lround(double);
+double nan(const char *) __pure2;
double nextafter(double, double);
double remainder(double, double);
double remquo(double, double, int *);
@@ -343,6 +344,7 @@
float erfcf(float);
float hypotf(float, float);
float lgammaf(float);
+float tgammaf(float);
float acoshf(float);
float asinhf(float);
@@ -354,6 +356,7 @@
long long llroundf(float);
long lrintf(float);
long lroundf(float);
+float nanf(const char *) __pure2;
float nearbyintf(float);
float nextafterf(float, float);
float remainderf(float, float);
diff --git a/libm/src/s_nan.c b/libm/src/s_nan.c
new file mode 100644
index 0000000..e366e6b
--- /dev/null
+++ b/libm/src/s_nan.c
@@ -0,0 +1,131 @@
+/*-
+ * Copyright (c) 2007 David Schultz
+ * 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 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 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 <ctype.h>
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+#include <strings.h>
+
+#include "math_private.h"
+
+/* digittoint is in the FreeBSD C library, but not Bionic at this point */
+static int
+digittoint(char ch)
+{
+ int d;
+
+ d = ch - '0';
+ if ((unsigned)d < 10) {
+ return d;
+ }
+ d = ch - 'a';
+ if ((unsigned)d < 6) {
+ return d + 10;
+ }
+ d = ch - 'A';
+ if ((unsigned)d < 6) {
+ return d + 10;
+ }
+ return -1;
+}
+
+/*
+ * Scan a string of hexadecimal digits (the format nan(3) expects) and
+ * make a bit array (using the local endianness). We stop when we
+ * encounter an invalid character, NUL, etc. If we overflow, we do
+ * the same as gcc's __builtin_nan(), namely, discard the high order bits.
+ *
+ * The format this routine accepts needs to be compatible with what is used
+ * in contrib/gdtoa/hexnan.c (for strtod/scanf) and what is used in
+ * __builtin_nan(). In fact, we're only 100% compatible for strings we
+ * consider valid, so we might be violating the C standard. But it's
+ * impossible to use nan(3) portably anyway, so this seems good enough.
+ */
+void
+_scan_nan(uint32_t *words, int num_words, const char *s)
+{
+ int si; /* index into s */
+ int bitpos; /* index into words (in bits) */
+
+ bzero(words, num_words * sizeof(uint32_t));
+
+ /* Allow a leading '0x'. (It's expected, but redundant.) */
+ if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
+ s += 2;
+
+ /* Scan forwards in the string, looking for the end of the sequence. */
+ for (si = 0; isxdigit(s[si]); si++)
+ ;
+
+ /* Scan backwards, filling in the bits in words[] as we go. */
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+ for (bitpos = 0; bitpos < 32 * num_words; bitpos += 4) {
+#else
+ for (bitpos = 32 * num_words - 4; bitpos >= 0; bitpos -= 4) {
+#endif
+ if (--si < 0)
+ break;
+ words[bitpos / 32] |= digittoint(s[si]) << (bitpos % 32);
+ }
+}
+
+double
+nan(const char *s)
+{
+ union {
+ double d;
+ uint32_t bits[2];
+ } u;
+
+ _scan_nan(u.bits, 2, s);
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+ u.bits[1] |= 0x7ff80000;
+#else
+ u.bits[0] |= 0x7ff80000;
+#endif
+ return (u.d);
+}
+
+float
+nanf(const char *s)
+{
+ union {
+ float f;
+ uint32_t bits[1];
+ } u;
+
+ _scan_nan(u.bits, 1, s);
+ u.bits[0] |= 0x7fc00000;
+ return (u.f);
+}
+
+#if (LDBL_MANT_DIG == 53)
+__weak_alias(nanl, nan);
+#endif
diff --git a/libm/src/s_tgammaf.c b/libm/src/s_tgammaf.c
new file mode 100644
index 0000000..9993d91
--- /dev/null
+++ b/libm/src/s_tgammaf.c
@@ -0,0 +1,43 @@
+/*-
+ * Copyright (c) 2008 David Schultz <das@FreeBSD.ORG>
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <math.h>
+
+/*
+ * We simply call tgamma() rather than bloating the math library with
+ * a float-optimized version of it. The reason is that tgammaf() is
+ * essentially useless, since the function is superexponential and
+ * floats have very limited range.
+ */
+float
+tgammaf(float x)
+{
+
+ return (tgamma(x));
+}
