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Fix for conflicting definition of _xgetbv with mingw-w64 >= 5

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Simplify the #ifdef logic so it is easier to follow and add exceptions in the
future if necessary.
This commit is contained in:
Tim Mayberry 2016-10-14 12:35:05 +10:00
parent 8520312f97
commit ed09a68f24
1 changed files with 30 additions and 18 deletions
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48
libs/pbd/fpu.cc
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@ -71,24 +71,18 @@ __cpuid(int regs[4], int cpuid_leaf)
#endif /* !PLATFORM_WINDOWS */
#ifndef COMPILER_MSVC
static uint64_t
_xgetbv (uint32_t xcr)
{
#ifdef __APPLE__
/* it would be nice to make this work on OS X but as long we use veclib,
we don't really need to know about SSE/AVX on that platform.
*/
return 0;
#else
uint32_t eax, edx;
__asm__ volatile ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (xcr));
return (static_cast<uint64_t>(edx) << 32) | eax;
#ifndef HAVE_XGETBV // Allow definition by build system
#if defined(__MINGW32__) && defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR >= 5
#define HAVE_XGETBV
#elif defined(_MSC_VER) && _MSC_VER >= 1600
// '_xgetbv()' was only available from VC10 onwards
#define HAVE_XGETBV
#endif
#endif
}
#elif _MSC_VER < 1600
#ifndef HAVE_XGETBV
#ifdef COMPILER_MSVC
// '_xgetbv()' was only available from VC10 onwards
__declspec(noinline) static uint64_t
@ -101,11 +95,29 @@ _xgetbv (uint32_t xcr)
// to place this function into its own (unoptimized) source file.
__asm {
mov ecx, [xcr]
__asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0 /*xgetbv*/
}
__asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0 /*xgetbv*/
}
}
#else
static uint64_t
_xgetbv (uint32_t xcr)
{
#ifdef __APPLE__
/* it would be nice to make this work on OS X but as long we use veclib,
we don't really need to know about SSE/AVX on that platform.
*/
return 0;
#else
uint32_t eax, edx;
__asm__ volatile ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (xcr));
return (static_cast<uint64_t>(edx) << 32) | eax;
#endif
}
#endif /* !COMPILER_MSVC */
#endif /* !HAVE_XGETBV */
#endif /* ARCH_X86 */
#ifndef _XCR_XFEATURE_ENABLED_MASK