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+ added Inf/Nan stuff

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florian 2004-02-20 20:10:44 +00:00
parent df4665129f
commit b43854bb09
1 changed files with 89 additions and 43 deletions
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56
rtl/objpas/math.pp
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@ -114,6 +114,10 @@ interface
EqualsValue = 0;
LessThanValue = Low(TValueRelationship);
GreaterThanValue = High(TValueRelationship);
{$ifndef ver1_0}
NaN = 0.0/0.0;
Infinity = 1.0/0.0;
{$endif ver1_0}
{ Min/max determination }
function MinIntValue(const Data: array of Integer): Integer;
@ -151,10 +155,6 @@ function EnsureRange(const AValue, AMin, AMax: Int64): Int64;
function EnsureRange(const AValue, AMin, AMax: Double): Double;
{$endif FPC_HAS_TYPE_DOUBLE}
// Sign functions
Type
TValueSign = -1..1;
@ -179,6 +179,9 @@ function IsZero(const A: Extended; Epsilon: Extended): Boolean;
function IsZero(const A: Extended): Boolean;
{$endif FPC_HAS_TYPE_EXTENDED}
function IsNan(const d : Double): Boolean;
function IsInfinite(const d : Double): Boolean;
{$ifdef FPC_HAS_TYPE_EXTENDED}
function SameValue(const A, B: Extended): Boolean;
{$endif}
@ -1206,6 +1209,46 @@ begin
end;
{$endif FPC_HAS_TYPE_EXTENDED}
type
TSplitDouble = packed record
cards: Array[0..1] of cardinal;
end;
function IsNan(const d : Double): Boolean;
var
fraczero, expMaximal: boolean;
begin
{$if defined(BIG_ENDIAN) or (defined(CPUARM) and defined(FPUFPA))}
expMaximal := ((TSplitDouble(d).cards[0] shr 20) and $7ff) = 2047;
fraczero:= (TSplitDouble(d).cards[0] and $fffff = 0) and
(TSplitDouble(d).cards[1] = 0);
{$else BIG_ENDIAN}
expMaximal := ((TSplitDouble(d).cards[1] shr 20) and $7ff) = 2047;
fraczero := (TSplitDouble(d).cards[1] and $fffff = 0) and
(TSplitDouble(d).cards[0] = 0);
{$endif BIG_ENDIAN}
Result:=expMaximal and not(fraczero);
end;
function IsInfinite(const d : Double): Boolean;
var
fraczero, expMaximal: boolean;
begin
{$if defined(BIG_ENDIAN) or (defined(CPUARM) and defined(FPUFPA))}
expMaximal := ((TSplitDouble(d).cards[0] shr 20) and $7ff) = 2047;
fraczero:= (TSplitDouble(d).cards[0] and $fffff = 0) and
(TSplitDouble(d).cards[1] = 0);
{$else BIG_ENDIAN}
expMaximal := ((TSplitDouble(d).cards[1] shr 20) and $7ff) = 2047;
fraczero := (TSplitDouble(d).cards[1] and $fffff = 0) and
(TSplitDouble(d).cards[0] = 0);
{$endif BIG_ENDIAN}
Result:=expMaximal and fraczero;
end;
{$ifdef FPC_HAS_TYPE_EXTENDED}
function SameValue(const A, B: Extended; Epsilon: Extended): Boolean;
@ -1266,7 +1309,10 @@ end;
end.
{
$Log$
Revision 1.19 2004-02-09 18:53:09 florian
Revision 1.20 2004-02-20 20:10:44 florian
+ added Inf/Nan stuff
Revision 1.19 2004/02/09 18:53:09 florian
* compilation on ppc fixed
Revision 1.18 2004/02/09 17:21:04 marco