https://github.com/visualboyadvance-m/visualboyadvance-m/commit/af0de1c4b308ef8d9a081ecf407805b75a99d877.patch
https://bugs.gentoo.org/799362

From: Rafael Kitover <rkitover@gmail.com>
Date: Fri, 4 Oct 2019 07:35:49 +0000
Subject: [PATCH] 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>
--- a/src/filters/xBRZ/xbrz.cpp
+++ b/src/filters/xBRZ/xbrz.cpp
@@ -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