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* handle frac(+/-Inf or Nan) correctly in the software implementation, resolves #39584

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This commit is contained in:
florian 2022-02-17 21:59:39 +01:00
parent b3e079c5da
commit 67fedc6b5b
2 changed files with 35 additions and 4 deletions
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15
rtl/inc/genmath.inc
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@ -1757,10 +1757,17 @@ end;
{$ifndef FPC_SYSTEM_HAS_FRAC}
function fpc_frac_real(d : ValReal) : ValReal;compilerproc;
begin
result := d - Int(d);
end;
function fpc_frac_real(d : ValReal) : ValReal;compilerproc;
var
i: integer;
begin
i := (float64high(d) and $7ff00000) shr 20;
if i=$7FF then
{ return NaN }
result := (d-d)/0.0
else
result := d - Int(d);
end;
{$endif}

24
tests/test/units/system/tfrac.pp Normal file
View File

@ -0,0 +1,24 @@
{ %OPT=-O- }
uses
math,sysutils;
var
d : double;
s : string;
begin
SetExceptionMask([exInvalidOp]);
d:=Infinity;
str(frac(d),s);
writeln(s);
if pos('Nan',s)=0 then
halt(1);
d:=-Infinity;
str(frac(d),s);
writeln(s);
if pos('Nan',s)=0 then
halt(1);
d:=NaN;
str(frac(d),s);
writeln(s);
if pos('Nan',s)=0 then
halt(1);
end.