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+ function copysign(x,y), calculates abs(x)*sign(y), private for unit math (not in interface).

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* fixed sinh and arsinh return values at -0.0 and -Inf.

git-svn-id: trunk@33069 -
This commit is contained in:
sergei 2016-02-07 15:34:02 +00:00
parent fd61d65313
commit 9b84581f4c
1 changed files with 31 additions and 9 deletions
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40
rtl/objpas/math.pp
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@ -616,6 +616,8 @@ procedure ClearExceptions(RaisePending: Boolean =true);
implementation
function copysign(x,y: float): float; forward; { returns abs(x)*sign(y) }
{ include cpu specific stuff }
{$i mathu.inc}
@ -883,7 +885,8 @@ function sinh(x : float) : float;
temp : float;
begin
temp:=exp(x);
sinh:=0.5*(temp-1.0/temp);
{ copysign ensures that sinh(-0.0)=-0.0 }
sinh:=copysign(0.5*(temp-1.0/temp),x);
end;
Const MaxTanh = 5678.22249441322; // Ln(MaxExtended)/2
@ -919,8 +922,13 @@ function arcosh(x : float) : float;
end;
function arsinh(x : float) : float;
var
z: float;
begin
arsinh:=Ln(x+Sqrt(1+x*x));
z:=abs(x);
z:=Ln(z+Sqrt(1+z*z));
{ copysign ensures that arsinh(-Inf)=-Inf and arsinh(-0.0)=-0.0 }
arsinh:=copysign(z,x);
end;
function artanh(x : float) : float;
@ -2165,6 +2173,10 @@ type
cards: Array[0..1] of cardinal;
end;
TSplitExtended = packed record
cards: Array[0..1] of cardinal;
w: word;
end;
function IsNan(const d : Single): Boolean; overload;
begin
@ -2191,13 +2203,6 @@ function IsNan(const d : Double): Boolean;
{$ifdef FPC_HAS_TYPE_EXTENDED}
function IsNan(const d : Extended): Boolean; overload;
type
TSplitExtended = packed record
case byte of
0: (bytes: Array[0..9] of byte);
1: (words: Array[0..4] of word);
2: (cards: Array[0..1] of cardinal; w: word);
end;
var
fraczero, expMaximal: boolean;
begin
@ -2228,6 +2233,23 @@ function IsInfinite(const d : Double): Boolean;
Result:=expMaximal and fraczero;
end;
function copysign(x,y: float): float;
begin
{$if defined(FPC_HAS_TYPE_FLOAT128)}
{$error copysign not yet implemented for float128}
{$elseif defined(FPC_HAS_TYPE_EXTENDED)}
TSplitExtended(x).w:=(TSplitExtended(x).w and $7fff) or (TSplitExtended(y).w and $8000);
{$elseif defined(FPC_HAS_TYPE_DOUBLE)}
{$if defined(FPC_BIG_ENDIAN) or defined(FPC_DOUBLE_HILO_SWAPPED)}
TSplitDouble(x).cards[0]:=(TSplitDouble(x).cards[0] and $7fffffff) or (TSplitDouble(y).cards[0] and longword($80000000));
{$else}
TSplitDouble(x).cards[1]:=(TSplitDouble(x).cards[1] and $7fffffff) or (TSplitDouble(y).cards[1] and longword($80000000));
{$endif}
{$else}
longword(x):=longword(x and $7fffffff) or (longword(y) and longword($80000000));
{$endif}
result:=x;
end;
{$ifdef FPC_HAS_TYPE_EXTENDED}
function SameValue(const A, B: Extended; Epsilon: Extended): Boolean;