From 7439924891496025edf60c9da6a782f362a50c70 Mon Sep 17 00:00:00 2001
From: Tim Dettmers <tim.dettmers@gmail.com>
Date: Tue, 5 Oct 2021 19:16:20 -0700
Subject: Initial commit

---
 include/Portable.h | 151 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 include/Portable.h

(limited to 'include/Portable.h')

diff --git a/include/Portable.h b/include/Portable.h
new file mode 100644
index 0000000..1710b05
--- /dev/null
+++ b/include/Portable.h
@@ -0,0 +1,151 @@
+#pragma once
+#include <limits>
+#include <cmath>
+#include <stdexcept>
+#include <sstream>
+
+#ifdef __FMA__
+#define USE_FMA
+#endif
+
+#ifdef __AVX2__
+#define USE_AVX2
+#endif
+
+#ifdef __AVX__
+#define USE_AVX
+#endif
+
+
+#ifdef __SSE4_1__
+#define USE_SSE41
+#endif
+
+#ifdef __SSE4_2__
+#define USE_SSE42
+#endif
+
+
+#ifndef _MSC_VER
+#include <stdint.h>
+#endif
+
+namespace BinSearch {
+
+#ifndef _MSC_VER
+typedef  int8_t   int8;
+typedef uint8_t  uint8;
+typedef  int32_t   int32;
+typedef uint32_t  uint32;
+typedef  int64_t   int64;
+typedef uint64_t  uint64;
+#else
+typedef  __int8   int8;
+typedef unsigned __int8  uint8;
+typedef  __int32   int32;
+typedef unsigned __int32  uint32;
+typedef  __int64   int64;
+typedef unsigned __int64  uint64;
+#endif
+
+namespace Details {
+
+#define myassert(cond, msg) if (!cond){ std::ostringstream os; os << "\nassertion failed: " << #cond << ", " << msg << "\n"; throw std::invalid_argument(os.str()); }
+
+// log2 is not defined in VS2008
+#if defined(_MSC_VER)
+inline uint32 log2 (uint32 val) {
+    if (val == 1) return 0;
+    uint32 ret = 0;
+    do {
+        ret++;
+        val >>= 1;
+    } while (val > 1);
+    return ret;
+}
+#endif
+
+#ifdef _DEBUG
+#define DEBUG
+#endif
+
+#ifdef _MSC_VER
+#   define FORCE_INLINE __forceinline
+#   define NO_INLINE __declspec(noinline)
+#else
+#   define NO_INLINE __attribute__((noinline))
+#   ifdef DEBUG
+#       define FORCE_INLINE NO_INLINE
+#   else
+#       define FORCE_INLINE __attribute__((always_inline)) inline
+#   endif
+#endif
+
+#ifdef USE_AVX
+#define COMISS "vcomiss"
+#define COMISD "vcomisd"
+#else
+#define COMISS "comiss"
+#define COMISD "comisd"
+#endif
+
+// nextafter is not defined in VS2008
+#if defined(_MSC_VER) && (_MSC_VER <= 1500)
+#include <float.h>
+inline float mynext(float x)
+{
+    return _nextafterf(x, std::numeric_limits<float>::max());
+}
+
+inline double mynext(double x)
+{
+    return _nextafter(x, std::numeric_limits<double>::max());
+}
+inline float myprev(float x)
+{
+    return _nextafterf(x, -std::numeric_limits<float>::max());
+}
+
+inline double myprev(double x)
+{
+    return _nextafter(x, -std::numeric_limits<double>::max());
+}
+#else
+inline float mynext(float x)
+{
+    return std::nextafterf(x, std::numeric_limits<float>::max());
+}
+
+inline double mynext(double x)
+{
+    return std::nextafter(x, std::numeric_limits<double>::max());
+}
+inline float myprev(float x)
+{
+    return std::nextafterf(x, -std::numeric_limits<float>::max());
+}
+
+inline double myprev(double x)
+{
+    return std::nextafter(x, -std::numeric_limits<double>::max());
+}
+#endif
+
+template <typename T>
+inline T next(T x)
+{
+    for (int i = 0; i < 4; ++i)
+        x = mynext(x);
+    return x;
+}
+
+template <typename T>
+inline T prev(T x)
+{
+    for (int i = 0; i < 4; ++i)
+        x = myprev(x);
+    return x;
+}
+
+} // namepsace Details
+} // namespace BinSearch
-- 
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