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xbrz: fix inline asm check 

Use correct cpp code to detect x86/amd64 architecture to use inline asm.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>
This commit is contained in:
Rafael Kitover 2019-10-04 07:35:49 +00:00
parent e811070d01
commit af0de1c4b3
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GPG Key ID: 08AB596679D86240
1 changed files with 3 additions and 3 deletions
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6
src/filters/xBRZ/xbrz.cpp
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@ -66,17 +66,17 @@ uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate c
inline double fastSqrt(double n)
{
#ifdef __GNUC__ || __clang__ || __MINGW64_VERSION_MAJOR || __MINGW32_MAJOR_VERSION
#if (defined(__GNUC__) || defined(__clang__)) && (defined(__x86_64__) || defined(__i386__))
__asm__ ("fsqrt" : "+t" (n));
return n;
#elif _MSC_VER && _M_IX86
#elif defined(_MSC_VER) && defined(_M_IX86)
// speeds up xBRZ by about 9% compared to std::sqrt which internally uses
// the same assembler instructions but adds some "fluff"
__asm {
fld n
fsqrt
}
#else // _MSC_VER && _M_X64 OR other platforms
#else // defined(_MSC_VER) && defined(_M_X64) OR other platforms
// VisualStudio x86_64 does not allow inline ASM
return std::sqrt(n);
#endif