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Report From: Delphi-BCB/Compiler/Delphi/BASM [ Add a report in this area ]

Report #: 87994

Status: Open

SizeOf evaluated incorrectly in assembly expressions

Project: Delphi

Build #: 15.0.3890.34076

Version: 15.0

Submitted By: Philipp S

Report Type: Basic functionality failure

Date Reported: 9/12/2010 10:57:40 AM

Severity: Infrequently encountered problem

Last Updated: 3/20/2012 2:24:39 AM

Platform: All platforms

Internal Tracking #: 280439

Resolution: None (Resolution Comments)

Resolved in Build: : None

Duplicate of: None

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Overall Rating: (1 Total Rating)

4.00 out of 5

Total Votes: 15

Description

The use of SizeOf(Type) is seemingly valid in BASM. However, SizeOf(Type) does not appear to be evaluated correctly in BASM.

Note: this seems to be the case for at least Delphi XE, D2010, D2009 and D2006.

Steps to Reproduce:

Inspect the code generated for the following routine:
Expected: all three statements produce the same code
Observed: those statements containing SizeOf(..) do not produce correct code

procedure Bug_Asm_SizeOf;
type
  TByteSet = set of byte;
const
  SzByteSet = SizeOf (TByteSet); // = 256/8 = 32 bytes = $20 bytes
asm
  mov eax, longword(SizeOf(TByteSet))  //<<< WRONG
  // B831000000       mov eax,$00000031
  mov eax, dword ptr SizeOf(TByteSet)  //<<< WRONG
  // B831000000       mov eax,$00000031
  mov eax, SzByteSet                   //<<< correct
  // B820000000       mov eax,$00000020
end;

Workarounds

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