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

Report #: 80128

Status: Open

XGETBV instruction not recognised

Project: Delphi

Build #: 14.0.3539.24502

Version: 14.0

Submitted By: Philipp S

Report Type: Basic functionality failure

Date Reported: 12/7/2009 1:21:09 PM

Severity: Infrequently encountered problem

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

Platform: All platforms

Internal Tracking #: 273900

Resolution: None (Resolution Comments)

Resolved in Build: : None

Duplicate of: None

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Description

The assembly instruction XGETBV (Get Value of Extended Control Register; opcode 0F 01 D0) is not recognised by the assembler.

This instruction is used e.g. for checking whether the AVX instruction set can be used on a machine.

Reference:
Intel? 64 and IA-32 Architectures
Software Developer? Manual
Volume 2B:
Instruction Set Reference, N-Z

Steps to Reproduce:

asm
  push ebx
  mov eax,1
  cpuid
  bt ecx, 27  // CPUID.1:ECX.OSXSAVE[bit 27] = 1: XGETBV available and enabled for application use
  jnc @not_supported
    XGETBV  // <- [DCC Error]  E2003 Undeclared identifier: 'xgetbv'
  @not_supported:
  pop ebx
end;

Workarounds

db 0Fh, 01h, 0D0h //XGETBV

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