add significand[fl] math functions

[musl] / include / math.h

diff --git a/include/math.h b/include/math.h
index 9c06c96..656f786 100644 (file)
--- a/include/math.h
+++ b/include/math.h
@@ -25,11 +25,11 @@ extern "C" {
 #define HUGE_VALL ((long double)INFINITY)
 
 #define MATH_ERRNO  1
-#define MATH_EXCEPT 2
+#define MATH_ERREXCEPT 2
 #define math_errhandling 2
 
-#define FP_ILOGBNAN (((unsigned)-1)>>1)
-#define FP_ILOGB0 (~FP_ILOGBNAN)
+#define FP_ILOGBNAN (-1-(int)(((unsigned)-1)>>1))
+#define FP_ILOGB0 FP_ILOGBNAN
 
 #define FP_NAN       0
 #define FP_INFINITE  1
@@ -41,8 +41,11 @@ int __fpclassify(double);
 int __fpclassifyf(float);
 int __fpclassifyl(long double);
 
-#define __FLOAT_BITS(f) (((union { float __f; __uint32_t __i; }){ (f) }).__i)
-#define __DOUBLE_BITS(f) (((union { double __f; __uint64_t __i; }){ (f) }).__i)
+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) : \
@@ -74,8 +77,8 @@ int __signbitf(float);
 int __signbitl(long double);
 
 #define signbit(x) ( \
-       sizeof(x) == sizeof(float) ? !!(__FLOAT_BITS(x) & 0x80000000) : \
-       sizeof(x) == sizeof(double) ? !!(__DOUBLE_BITS(x) & (__uint64_t)1<<63) : \
+       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)))
@@ -196,8 +199,8 @@ float       fmodf(float, float);
 long double fmodl(long double, long double);
 
 double      frexp(double, int *);
-float       frexpf(float value, int *);
-long double frexpl(long double value, int *);
+float       frexpf(float, int *);
+long double frexpl(long double, int *);
 
 double      hypot(double, double);
 float       hypotf(float, float);
@@ -327,8 +330,7 @@ double      trunc(double);
 float       truncf(float);
 long double truncl(long double);
 
-#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
-#define MAXFLOAT        3.40282347e+38F
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define M_E             2.7182818284590452354   /* e */
 #define M_LOG2E         1.4426950408889634074   /* log_2 e */
 #define M_LOG10E        0.43429448190325182765  /* log_10 e */
@@ -342,12 +344,14 @@ 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) */
+#endif
 
-extern int signgam;
+#if defined(_XOPEN_SOURCE)
+#define MAXFLOAT        3.40282347e+38F
+#endif
 
-double      gamma(double);
-float       gammaf(float);
-long double gammal(long double);
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+extern int signgam;
 
 double      j0(double);
 double      j1(double);
@@ -359,6 +363,7 @@ double      yn(int, double);
 #endif
 
 #ifdef _GNU_SOURCE
+#define HUGE        3.40282347e+38F
 double      scalb(double, double);
 float       scalbf(float, float);
 long double scalbl(long double, long double);
@@ -367,6 +372,10 @@ 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*);
@@ -384,6 +393,17 @@ 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);
+double      pow10(double);
+float       pow10f(float);
+long double pow10l(long double);
+
+double      significand(double);
+float       significandf(float);
+long double significandl(long double);
 #endif
 
 #ifdef __cplusplus