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-rw-r--r--lib/libm/libm.h351
1 files changed, 351 insertions, 0 deletions
diff --git a/lib/libm/libm.h b/lib/libm/libm.h
new file mode 100644
index 00000000..6f57c128
--- /dev/null
+++ b/lib/libm/libm.h
@@ -0,0 +1,351 @@
+#ifndef _LIBM_H
+#define _LIBM_H
+
+#include <asm/fpmath.h>
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+
+#define hidden __attribute__((visibility("hidden")))
+
+#define __PDP_ENDIAN 3412
+
+#define BIG_ENDIAN __ORDER_BIG_ENDIAN__
+#define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
+#define PDP_ENDIAN __ORDER_PDP_ENDIAN
+#define BYTE_ORDER __BYTE_ORDER__
+#define __BYTE_ORDER __BYTE_ORDER__
+#define __LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
+
+static __inline uint16_t __bswap16(uint16_t __x)
+{
+ return __x << 8 | __x >> 8;
+}
+
+static __inline uint32_t __bswap32(uint32_t __x)
+{
+ return __x >> 24 | (__x >> 8 & 0xff00) | (__x << 8 & 0xff0000) |
+ __x << 24;
+}
+
+static __inline uint64_t __bswap64(uint64_t __x)
+{
+ return (__bswap32(__x) + 0ULL) << 32 | __bswap32(__x >> 32);
+}
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define htobe16(x) __bswap16(x)
+#define be16toh(x) __bswap16(x)
+#define htobe32(x) __bswap32(x)
+#define be32toh(x) __bswap32(x)
+#define htobe64(x) __bswap64(x)
+#define be64toh(x) __bswap64(x)
+#define htole16(x) (uint16_t)(x)
+#define le16toh(x) (uint16_t)(x)
+#define htole32(x) (uint32_t)(x)
+#define le32toh(x) (uint32_t)(x)
+#define htole64(x) (uint64_t)(x)
+#define le64toh(x) (uint64_t)(x)
+#else
+#define htobe16(x) (uint16_t)(x)
+#define be16toh(x) (uint16_t)(x)
+#define htobe32(x) (uint32_t)(x)
+#define be32toh(x) (uint32_t)(x)
+#define htobe64(x) (uint64_t)(x)
+#define be64toh(x) (uint64_t)(x)
+#define htole16(x) __bswap16(x)
+#define le16toh(x) __bswap16(x)
+#define htole32(x) __bswap32(x)
+#define le32toh(x) __bswap32(x)
+#define htole64(x) __bswap64(x)
+#define le64toh(x) __bswap64(x)
+#endif
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && \
+ __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+union ldshape {
+ long double f;
+ struct {
+ uint64_t m;
+ uint16_t se;
+ } i;
+};
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && \
+ __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+/* This is the m68k variant of 80-bit long double, and this definition only
+ * works on archs where the alignment requirement of uint64_t is <= 4. */
+union ldshape {
+ long double f;
+ struct {
+ uint16_t se;
+ uint16_t pad;
+ uint64_t m;
+ } i;
+};
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 && \
+ __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+union ldshape {
+ long double f;
+ struct {
+ uint64_t lo;
+ uint32_t mid;
+ uint16_t top;
+ uint16_t se;
+ } i;
+ struct {
+ uint64_t lo;
+ uint64_t hi;
+ } i2;
+};
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 && \
+ __BYTE_ORDER == __BIG_ENDIAN
+union ldshape {
+ long double f;
+ struct {
+ uint16_t se;
+ uint16_t top;
+ uint32_t mid;
+ uint64_t lo;
+ } i;
+ struct {
+ uint64_t hi;
+ uint64_t lo;
+ } i2;
+};
+#else
+#error Unsupported long double representation
+#endif
+
+/* Support non-nearest rounding mode. */
+#define WANT_ROUNDING 1
+/* Support signaling NaNs. */
+#define WANT_SNAN 0
+
+#if WANT_SNAN
+#error SNaN is unsupported
+#else
+#define issignalingf_inline(x) 0
+#define issignaling_inline(x) 0
+#endif
+
+#ifndef TOINT_INTRINSICS
+#define TOINT_INTRINSICS 0
+#endif
+
+#if TOINT_INTRINSICS
+/* Round x to nearest int in all rounding modes, ties have to be rounded
+ consistently with converttoint so the results match. If the result
+ would be outside of [-2^31, 2^31-1] then the semantics is unspecified. */
+static double_t roundtoint(double_t);
+
+/* Convert x to nearest int in all rounding modes, ties have to be rounded
+ consistently with roundtoint. If the result is not representible in an
+ int32_t then the semantics is unspecified. */
+static int32_t converttoint(double_t);
+#endif
+
+/* Helps static branch prediction so hot path can be better optimized. */
+#ifdef __GNUC__
+#define predict_true(x) __builtin_expect(!!(x), 1)
+#define predict_false(x) __builtin_expect(x, 0)
+#else
+#define predict_true(x) (x)
+#define predict_false(x) (x)
+#endif
+
+/* Evaluate an expression as the specified type. With standard excess
+ precision handling a type cast or assignment is enough (with
+ -ffloat-store an assignment is required, in old compilers argument
+ passing and return statement may not drop excess precision). */
+
+static inline float eval_as_float(float x)
+{
+ float y = x;
+ return y;
+}
+
+static inline double eval_as_double(double x)
+{
+ double y = x;
+ return y;
+}
+
+/* fp_barrier returns its input, but limits code transformations
+ as if it had a side-effect (e.g. observable io) and returned
+ an arbitrary value. */
+
+#ifndef fp_barrierf
+#define fp_barrierf fp_barrierf
+static inline float fp_barrierf(float x)
+{
+ volatile float y = x;
+ return y;
+}
+#endif
+
+#ifndef fp_barrier
+#define fp_barrier fp_barrier
+static inline double fp_barrier(double x)
+{
+ volatile double y = x;
+ return y;
+}
+#endif
+
+#ifndef fp_barrierl
+#define fp_barrierl fp_barrierl
+static inline long double fp_barrierl(long double x)
+{
+ volatile long double y = x;
+ return y;
+}
+#endif
+
+/* fp_force_eval ensures that the input value is computed when that's
+ otherwise unused. To prevent the constant folding of the input
+ expression, an additional fp_barrier may be needed or a compilation
+ mode that does so (e.g. -frounding-math in gcc). Then it can be
+ used to evaluate an expression for its fenv side-effects only. */
+
+#ifndef fp_force_evalf
+#define fp_force_evalf fp_force_evalf
+static inline void fp_force_evalf(float x)
+{
+ (void)x;
+}
+#endif
+
+#ifndef fp_force_eval
+#define fp_force_eval fp_force_eval
+static inline void fp_force_eval(double x)
+{
+ (void)x;
+}
+#endif
+
+#ifndef fp_force_evall
+#define fp_force_evall fp_force_evall
+static inline void fp_force_evall(long double x)
+{
+ (void)x;
+}
+#endif
+
+#define FORCE_EVAL(x) \
+ do { \
+ if (sizeof(x) == sizeof(float)) { \
+ fp_force_evalf(x); \
+ } else if (sizeof(x) == sizeof(double)) { \
+ fp_force_eval(x); \
+ } else { \
+ fp_force_evall(x); \
+ } \
+ } while (0)
+
+#define asuint(f) \
+ ((union { \
+ float _f; \
+ uint32_t _i; \
+ }){ f }) \
+ ._i
+#define asfloat(i) \
+ ((union { \
+ uint32_t _i; \
+ float _f; \
+ }){ i }) \
+ ._f
+#define asuint64(f) \
+ ((union { \
+ double _f; \
+ uint64_t _i; \
+ }){ f }) \
+ ._i
+#define asdouble(i) \
+ ((union { \
+ uint64_t _i; \
+ double _f; \
+ }){ i }) \
+ ._f
+
+#define EXTRACT_WORDS(hi, lo, d) \
+ do { \
+ uint64_t __u = asuint64(d); \
+ (hi) = __u >> 32; \
+ (lo) = (uint32_t)__u; \
+ } while (0)
+
+#define GET_HIGH_WORD(hi, d) \
+ do { \
+ (hi) = asuint64(d) >> 32; \
+ } while (0)
+
+#define GET_LOW_WORD(lo, d) \
+ do { \
+ (lo) = (uint32_t)asuint64(d); \
+ } while (0)
+
+#define INSERT_WORDS(d, hi, lo) \
+ do { \
+ (d) = asdouble(((uint64_t)(hi) << 32) | (uint32_t)(lo)); \
+ } while (0)
+
+#define SET_HIGH_WORD(d, hi) INSERT_WORDS(d, hi, (uint32_t)asuint64(d))
+
+#define SET_LOW_WORD(d, lo) INSERT_WORDS(d, asuint64(d) >> 32, lo)
+
+#define GET_FLOAT_WORD(w, d) \
+ do { \
+ (w) = asuint(d); \
+ } while (0)
+
+#define SET_FLOAT_WORD(d, w) \
+ do { \
+ (d) = asfloat(w); \
+ } while (0)
+
+hidden int __rem_pio2_large(double *, double *, int, int, int);
+
+hidden int __rem_pio2(double, double *);
+hidden double __sin(double, double, int);
+hidden double __cos(double, double);
+hidden double __tan(double, double, int);
+hidden double __expo2(double, double);
+
+hidden int __rem_pio2f(float, double *);
+hidden float __sindf(double);
+hidden float __cosdf(double);
+hidden float __tandf(double, int);
+hidden float __expo2f(float, float);
+
+hidden int __rem_pio2l(long double, long double *);
+hidden long double __sinl(long double, long double, int);
+hidden long double __cosl(long double, long double);
+hidden long double __tanl(long double, long double, int);
+
+hidden long double __polevll(long double, const long double *, int);
+hidden long double __p1evll(long double, const long double *, int);
+
+extern int __signgam;
+hidden double __lgamma_r(double, int *);
+hidden float __lgammaf_r(float, int *);
+
+/* error handling functions */
+hidden float __math_xflowf(uint32_t, float);
+hidden float __math_uflowf(uint32_t);
+hidden float __math_oflowf(uint32_t);
+hidden float __math_divzerof(uint32_t);
+hidden float __math_invalidf(float);
+hidden double __math_xflow(uint32_t, double);
+hidden double __math_uflow(uint32_t);
+hidden double __math_oflow(uint32_t);
+hidden double __math_divzero(uint32_t);
+hidden double __math_invalid(double);
+#if LDBL_MANT_DIG != DBL_MANT_DIG
+hidden long double __math_invalidl(long double);
+#endif
+
+#define weak_alias(old, new) \
+ extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
+
+#endif
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