diff options
Diffstat (limited to 'newlib/libm/common/s_scalbn.c')
| -rw-r--r-- | newlib/libm/common/s_scalbn.c | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/newlib/libm/common/s_scalbn.c b/newlib/libm/common/s_scalbn.c index 5edf6b766..50f20efec 100644 --- a/newlib/libm/common/s_scalbn.c +++ b/newlib/libm/common/s_scalbn.c @@ -13,38 +13,44 @@ /* FUNCTION -<<scalbn>>, <<scalbnf>>---scale by power of two +<<scalbn>>, <<scalbnf>>, <<scalbln>>, <<scalblnf>>--scale by power of FLT_RADIX (=2) INDEX scalbn INDEX scalbnf +INDEX + scalbln +INDEX + scalblnf ANSI_SYNOPSIS #include <math.h> - double scalbn(double <[x]>, int <[y]>); - float scalbnf(float <[x]>, int <[y]>); - -TRAD_SYNOPSIS - #include <math.h> - double scalbn(<[x]>,<[y]>) - double <[x]>; - int <[y]>; - float scalbnf(<[x]>,<[y]>) - float <[x]>; - int <[y]>; + double scalbn(double <[x]>, int <[n]>); + float scalbnf(float <[x]>, int <[n]>); + double scalbln(double <[x]>, long int <[n]>); + float scalblnf(float <[x]>, long int <[n]>); DESCRIPTION -<<scalbn>> and <<scalbnf>> scale <[x]> by <[n]>, returning <[x]> times -2 to the power <[n]>. The result is computed by manipulating the -exponent, rather than by actually performing an exponentiation or -multiplication. +The <<scalbn>> and <<scalbln>> functions compute + @ifnottex + <[x]> times FLT_RADIX to the power <[n]>. + @end ifnottex + @tex + $x \cdot FLT\_RADIX^n$. + @end tex +efficiently. The result is computed by manipulating the exponent, rather than +by actually performing an exponentiation or multiplication. In this +floating-point implementation FLT_RADIX=2, which makes the <<scalbn>> +functions equivalent to the <<ldexp>> functions. RETURNS -<[x]> times 2 to the power <[n]>. +<[x]> times 2 to the power <[n]>. A range error may occur. PORTABILITY -Neither <<scalbn>> nor <<scalbnf>> is required by ANSI C or by the System V -Interface Definition (Issue 2). +ANSI C, POSIX + +SEEALSO +<<ldexp>> */ |