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The trunс() does not support Extended
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The trunс() does not support Extended 4 months 3 weeks ago #18654

  • Roman
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According to the documentation, the trunc function takes an argument of type ValReal, which in turn is defined as Extended(www.freepascal.org/docs-html/rtl/system/valreal.html). However, in systemh.inc the definition is different:
{$ifdef CPUX86_64}
{$ifdef FPC_HAS_TYPE_EXTENDED}
  { win64 doesn't support the legacy fpu }
  {$define DEFAULT_EXTENDED}
  {$define SUPPORT_EXTENDED}
  {$define SUPPORT_COMP}
  {$ifndef FPUNONE}
    ValReal = Extended;
  {$endif}
{$else FPC_HAS_TYPE_EXTENDED}
  {$define DEFAULT_DOUBLE}
  {$ifndef FPUNONE}
    ValReal = Double;
  {$endif}
{$endif FPC_HAS_TYPE_EXTENDED}

When installing CT64 on Windows10 64bit with Intel i5 or i7  ValReal is Double, but for CT32  VarReal is Extended!!! Why?!?!?!
Because of this, using Extended is impossible, because trunc generates an exception in many cases. In particular, this is a big problem in PascalSCADA, where this function is used to work with 32-bit numbers.

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Last edit: by Roman.

The trunс() does not support Extended 4 months 2 weeks ago #18655

  • Matis A.
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It's FreePascal staff, Sir

In many CT packages, we use "Single" or "Float"
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Last edit: by Matis A..

The trunс() does not support Extended 4 months 2 weeks ago #18656

  • Roman
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Thank you, but your answer did not help me
.
What should I do?
1. Change the PascalSCADA source code, adding my own trunc edition, and making my program effectively incompatible with the main PascalSCADA package
2. Rebuild СT64 with manually forced specification of options for ValReal=Extended
3. Refuse to build a 64-bit application in favor of a 32-bit one, where everything works correctly
4. ???????

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The trunс() does not support Extended 4 months 2 weeks ago #18657

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I also intend to compile my application in Linux - how are things with my problem there? I haven't tried to do it myself yet...

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The trunс() does not support Extended 4 months 2 weeks ago #18659

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Please,
a sample with the problem for testing...

My suggestion is to use 64bit 
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The trunс() does not support Extended