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-rw-r--r--src/internal/libm.h186
1 files changed, 186 insertions, 0 deletions
diff --git a/src/internal/libm.h b/src/internal/libm.h
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+/* origin: FreeBSD /usr/src/lib/msun/src/math_private.h */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#ifndef _LIBM_H
+#define _LIBM_H
+
+#include <stdint.h>
+#include <float.h>
+#include <math.h>
+#include <complex.h>
+
+#include "longdbl.h"
+
+union fshape {
+	float value;
+	uint32_t bits;
+};
+
+union dshape {
+	double value;
+	uint64_t bits;
+};
+
+/* Get two 32 bit ints from a double.  */
+#define EXTRACT_WORDS(hi,lo,d)                                  \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  (hi) = __u.bits >> 32;                                        \
+  (lo) = (uint32_t)__u.bits;                                    \
+} while (0)
+
+/* Get a 64 bit int from a double.  */
+#define EXTRACT_WORD64(i,d)                                     \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  (i) = __u.bits;                                               \
+} while (0)
+
+/* Get the more significant 32 bit int from a double.  */
+#define GET_HIGH_WORD(i,d)                                      \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  (i) = __u.bits >> 32;                                         \
+} while (0)
+
+/* Get the less significant 32 bit int from a double.  */
+#define GET_LOW_WORD(i,d)                                       \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  (i) = (uint32_t)__u.bits;                                     \
+} while (0)
+
+/* Set a double from two 32 bit ints.  */
+#define INSERT_WORDS(d,hi,lo)                                   \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.bits = ((uint64_t)(hi) << 32) | (uint32_t)(lo);           \
+  (d) = __u.value;                                              \
+} while (0)
+
+/* Set a double from a 64 bit int.  */
+#define INSERT_WORD64(d,i)                                      \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.bits = (i);                                               \
+  (d) = __u.value;                                              \
+} while (0)
+
+/* Set the more significant 32 bits of a double from an int.  */
+#define SET_HIGH_WORD(d,hi)                                     \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  __u.bits &= 0xffffffff;                                       \
+  __u.bits |= (uint64_t)(hi) << 32;                             \
+  (d) = __u.value;                                              \
+} while (0)
+
+/* Set the less significant 32 bits of a double from an int.  */
+#define SET_LOW_WORD(d,lo)                                      \
+do {                                                            \
+  union dshape __u;                                             \
+  __u.value = (d);                                              \
+  __u.bits &= 0xffffffff00000000ull;                            \
+  __u.bits |= (uint32_t)(lo);                                   \
+  (d) = __u.value;                                              \
+} while (0)
+
+/* Get a 32 bit int from a float.  */
+#define GET_FLOAT_WORD(i,d)                                     \
+do {                                                            \
+  union fshape __u;                                             \
+  __u.value = (d);                                              \
+  (i) = __u.bits;                                               \
+} while (0)
+
+/* Set a float from a 32 bit int.  */
+#define SET_FLOAT_WORD(d,i)                                     \
+do {                                                            \
+  union fshape __u;                                             \
+  __u.bits = (i);                                               \
+  (d) = __u.value;                                              \
+} while (0)
+
+/* fdlibm kernel functions */
+
+int    __rem_pio2_large(double*,double*,int,int,int);
+
+int    __rem_pio2(double,double*);
+double __sin(double,double,int);
+double __cos(double,double);
+double __tan(double,double,int);
+double __expo2(double);
+double complex __ldexp_cexp(double complex,int);
+
+int    __rem_pio2f(float,double*);
+float  __sindf(double);
+float  __cosdf(double);
+float  __tandf(double,int);
+float  __expo2f(float);
+float complex __ldexp_cexpf(float complex,int);
+
+long double __sinl(long double, long double, int);
+long double __cosl(long double, long double);
+long double __tanl(long double, long double, int);
+
+/* polynomial evaluation */
+long double __polevll(long double, long double *, int);
+long double __p1evll(long double, long double *, int);
+
+// FIXME: not needed when -fexcess-precision=standard is supported (>=gcc4.5)
+/*
+ * Attempt to get strict C99 semantics for assignment with non-C99 compilers.
+ */
+#if 1
+#define STRICT_ASSIGN(type, lval, rval) do {    \
+        volatile type __v = (rval);             \
+        (lval) = __v;                           \
+} while (0)
+#else
+#define STRICT_ASSIGN(type, lval, rval) ((lval) = (type)(rval))
+#endif
+
+
+/* complex */
+
+union dcomplex {
+	double complex z;
+	double a[2];
+};
+union fcomplex {
+	float complex z;
+	float a[2];
+};
+union lcomplex {
+	long double complex z;
+	long double a[2];
+};
+
+// FIXME: move to complex.h ?
+#define creal(z) ((double)(z))
+#define crealf(z) ((float)(z))
+#define creall(z) ((long double)(z))
+#define cimag(z) ((union dcomplex){(z)}.a[1])
+#define cimagf(z) ((union fcomplex){(z)}.a[1])
+#define cimagl(z) ((union lcomplex){(z)}.a[1])
+
+/* x + y*I is not supported properly by gcc */
+#define cpack(x,y) ((union dcomplex){.a={(x),(y)}}.z)
+#define cpackf(x,y) ((union fcomplex){.a={(x),(y)}}.z)
+#define cpackl(x,y) ((union lcomplex){.a={(x),(y)}}.z)
+
+#endif