compat/arch: simplify microarchitecture detection

1 files changed, 53 insertions, 0 deletions

diff --git a/compat/arch.hpp b/compat/arch.hpp
new file mode 100644
index 00000000..d5405f47
--- /dev/null
+++ b/compat/arch.hpp
@@ -0,0 +1,53 @@
+#pragma once
+
+// fix MSVC arch check macros
+
+// this file is too simple to fall under copyright, and
+// can be copied, modified, and redistributed freely with
+// no conditions. there's no warranty. -sh 20181226
+
+#ifdef __clang__
+#   pragma clang diagnostic push
+#   pragma clang diagnostic ignored "-Wreserved-id-macro"
+#   pragma clang diagnostic ignored "-Wunused-macros"
+#endif
+
+#if defined _MSC_VER
+#   if defined _M_AMD64
+#       undef __x86_64__
+#       define __x86_64__ 1
+#   elif defined _M_IX86
+#       undef __i386__
+#       define __i386__ 1
+#   endif
+
+#   if defined __AVX__ || defined __x86_64__ || \
+       defined _M_IX86 && _M_IX86_FP >= 2
+#       undef __SSE__
+#       undef __SSE2__
+#       undef __SSE3__
+#       define __SSE__ 1
+#       define __SSE2__ 1
+#       define __SSE3__ 1 // assume SSE3 in the _M_IX86_FP >= 2 case
+#   endif
+#endif
+
+#ifdef __clang__
+#   pragma clang diagnostic pop
+#endif
+
+#if defined __SSE3__
+#   define OTR_ARCH_DENORM_DAZ
+#   include <pmmintrin.h>
+#elif defined __SSE2__
+#   define OTR_ARCH_DENORM_FTZ
+#   include <emmintrin.h>
+#endif
+
+#if defined __SSE2__
+#   define OTR_ARCH_FPU_MASK
+#   include <xmmintrin.h>
+#endif
+
+#include <cfloat>
+#include <cfenv>