first try at writing an efficient and "correct" exp10

[musl] / include / math.h

diff --git a/include/math.h b/include/math.h
index 9c5f06e..65b1e91 100644 (file)
--- a/include/math.h
+++ b/include/math.h
@@ -5,24 +5,27 @@
 extern "C" {
 #endif
 
+#define __NEED_float_t
+#define __NEED_double_t
 #define __NEED___uint16_t
 #define __NEED___uint32_t
 #define __NEED___uint64_t
 #include <bits/alltypes.h>
 
-#define __MAKE_FLOAT(i) (((union { int __i; float __f; }){ .__i = i }).__f)
-
-#define NAN       __MAKE_FLOAT(0x7fc00000)
-#define INFINITY  __MAKE_FLOAT(0x7f800000)
+#if 100*__GNUC__+__GNUC_MINOR__ >= 303
+#define NAN       __builtin_nanf("")
+#define INFINITY  __builtin_inff()
+#else
+#define NAN       (0.0f/0.0f)
+#define INFINITY  1e40f
+#endif
 
 #define HUGE_VALF INFINITY
 #define HUGE_VAL  ((double)INFINITY)
 #define HUGE_VALL ((long double)INFINITY)
 
-#define MAXFLOAT  __MAKE_FLOAT(0x7f7fffff)
-
 #define MATH_ERRNO  1
-#define MATH_EXCEPT 2
+#define MATH_ERREXCEPT 2
 #define math_errhandling 2
 
 #define FP_ILOGBNAN (((unsigned)-1)>>1)
@@ -34,23 +37,56 @@ extern "C" {
 #define FP_SUBNORMAL 3
 #define FP_NORMAL    4
 
-int __fpclassifyf(float);
 int __fpclassify(double);
+int __fpclassifyf(float);
 int __fpclassifyl(long double);
 
+union __float_repr { float __f; __uint32_t __i; };
+union __double_repr { double __f; __uint64_t __i; };
+
+#define __FLOAT_BITS(f) (((union __float_repr){ (float)(f) }).__i)
+#define __DOUBLE_BITS(f) (((union __double_repr){ (double)(f) }).__i)
+
 #define fpclassify(x) ( \
        sizeof(x) == sizeof(float) ? __fpclassifyf(x) : \
        sizeof(x) == sizeof(double) ? __fpclassify(x) : \
        __fpclassifyl(x) )
 
-#define isinf(x)    (fpclassify(x) == FP_INFINITE)
-#define isnan(x)    (fpclassify(x) == FP_NAN)
-#define isnormal(x) (fpclassify(x) == FP_NORMAL)
-#define isfinite(x) (fpclassify(x) > FP_INFINITE)
+#define isinf(x) ( \
+       sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) == 0x7f800000 : \
+       sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & (__uint64_t)-1>>1) == (__uint64_t)0x7ff<<52 : \
+       __fpclassifyl(x) == FP_INFINITE)
+
+#define isnan(x) ( \
+       sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) > 0x7f800000 : \
+       sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & (__uint64_t)-1>>1) > (__uint64_t)0x7ff<<52 : \
+       __fpclassifyl(x) == FP_NAN)
+
+#define isnormal(x) ( \
+       sizeof(x) == sizeof(float) ? ((__FLOAT_BITS(x)+0x00800000) & 0x7fffffff) >= 0x01000000 : \
+       sizeof(x) == sizeof(double) ? ((__DOUBLE_BITS(x)+((__uint64_t)1<<52)) & (__uint64_t)-1>>1) >= (__uint64_t)1<<53 : \
+       __fpclassifyl(x) == FP_NORMAL)
 
-#define isunordered(x,y) (isnan((x)) ? ((y),1) : isnan((y)))
+#define isfinite(x) ( \
+       sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) < 0x7f800000 : \
+       sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & (__uint64_t)-1>>1) < (__uint64_t)0x7ff<<52 : \
+       __fpclassifyl(x) > FP_INFINITE)
 
-static inline int __isrel(long double __x, long double __y, int __rel)
+int __signbit(double);
+int __signbitf(float);
+int __signbitl(long double);
+
+#define signbit(x) ( \
+       sizeof(x) == sizeof(float) ? (int)(__FLOAT_BITS(x)>>31) : \
+       sizeof(x) == sizeof(double) ? (int)(__DOUBLE_BITS(x)>>63) : \
+       __signbitl(x) )
+
+#define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))
+
+#if __STDC_VERSION__ >= 199901L
+inline
+#endif
+static int __isrel(long double __x, long double __y, int __rel)
 {
        if (isunordered(__x, __y)) return 0;
        if (__rel==-2) return __x < __y;
@@ -295,6 +331,7 @@ float       truncf(float);
 long double truncl(long double);
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+#define MAXFLOAT        3.40282347e+38F
 #define M_E             2.7182818284590452354   /* e */
 #define M_LOG2E         1.4426950408889634074   /* log_2 e */
 #define M_LOG10E        0.43429448190325182765  /* log_10 e */
@@ -308,17 +345,52 @@ long double truncl(long double);
 #define M_2_SQRTPI      1.12837916709551257390  /* 2/sqrt(pi) */
 #define M_SQRT2         1.41421356237309504880  /* sqrt(2) */
 #define M_SQRT1_2       0.70710678118654752440  /* 1/sqrt(2) */
+
+extern int signgam;
+
 double      j0(double);
 double      j1(double);
 double      jn(int, double);
+
 double      y0(double);
 double      y1(double);
 double      yn(int, double);
-extern int signgam;
 #endif
 
 #ifdef _GNU_SOURCE
 double      scalb(double, double);
+float       scalbf(float, float);
+long double scalbl(long double, long double);
+
+void        sincos(double, double*, double*);
+void        sincosf(float, float*, float*);
+void        sincosl(long double, long double*, long double*);
+
+double      gamma(double);
+float       gammaf(float);
+long double gammal(long double);
+
+double      lgamma_r(double, int*);
+float       lgammaf_r(float, int*);
+long double lgammal_r(long double, int*);
+
+float       j0f(float);
+long double j0l(long double);
+float       j1f(float);
+long double j1l(long double);
+float       jnf(int, float);
+long double jnl(int, long double);
+
+float       y0f(float);
+long double y0l(long double);
+float       y1f(float);
+long double y1l(long double);
+float       ynf(int, float);
+long double ynl(int, long double);
+
+double      exp10(double);
+float       exp10f(float);
+long double exp10l(long double);
 #endif
 
 #ifdef __cplusplus