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Add '_xgetbv()' for MSVC-9 and earlier

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This commit is contained in:
John Emmas 2015-08-16 13:14:54 +01:00
parent f65bcc6e74
commit 1d2938b162
1 changed files with 17 additions and 0 deletions
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17
libs/pbd/fpu.cc
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@ -95,6 +95,23 @@ _xgetbv (uint32_t xcr)
#endif
}
#elif _MSC_VER < 1600
// '_xgetbv()' was only available from VC10 onwards
__declspec(noinline) static uint64_t
_xgetbv (uint32_t xcr)
{
return 0;
// N.B. The following would probably work for a pre-VC10 build,
// although it might suffer from optimization issues. We'd need
// to place this function into its own (unoptimized) source file.
__asm {
mov ecx, [xcr]
__asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0 /*xgetbv*/
}
}
#endif /* !COMPILER_MSVC */
#endif /* ARCH_X86 */