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authorMax Kellermann <max@duempel.org>2015-02-12 11:05:02 +0100
committerMax Kellermann <max@duempel.org>2015-02-12 11:05:02 +0100
commit821bc6d77795bd79910356bf70408cdb3143e394 (patch)
tree9978dd092dc16ef673621519cb71870a0de31127 /src
parent6e66a5b77b1c3317f7fbdd3614b20ffda2649d7a (diff)
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system/ByteOrder: use GCC built-ins if available
Diffstat (limited to '')
-rw-r--r--src/system/ByteOrder.hxx44
1 files changed, 38 insertions, 6 deletions
diff --git a/src/system/ByteOrder.hxx b/src/system/ByteOrder.hxx
index 42181fe2c..babc503a9 100644
--- a/src/system/ByteOrder.hxx
+++ b/src/system/ByteOrder.hxx
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2011-2013 Max Kellermann <max@duempel.org>,
+ * Copyright (C) 2011-2015 Max Kellermann <max@duempel.org>,
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -30,6 +30,8 @@
#ifndef BYTE_ORDER_HXX
#define BYTE_ORDER_HXX
+#include "Compiler.h"
+
#include <stdint.h>
#if defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
@@ -75,23 +77,53 @@ IsBigEndian()
}
static inline constexpr uint16_t
+GenericByteSwap16(uint16_t value)
+{
+ return (value >> 8) | (value << 8);
+}
+
+static inline constexpr uint32_t
+GenericByteSwap32(uint32_t value)
+{
+ return (value >> 24) | ((value >> 8) & 0x0000ff00) |
+ ((value << 8) & 0x00ff0000) | (value << 24);
+}
+
+static inline constexpr uint64_t
+GenericByteSwap64(uint64_t value)
+{
+ return uint64_t(GenericByteSwap32(uint32_t(value >> 32)))
+ | (uint64_t(GenericByteSwap32(value)) << 32);
+}
+
+static inline constexpr uint16_t
ByteSwap16(uint16_t value)
{
- return (value >> 8) | (value << 8);
+#if CLANG_OR_GCC_VERSION(4,8)
+ return __builtin_bswap16(value);
+#else
+ return GenericByteSwap16(value);
+#endif
}
static inline constexpr uint32_t
ByteSwap32(uint32_t value)
{
- return (value >> 24) | ((value >> 8) & 0x0000ff00) |
- ((value << 8) & 0x00ff0000) | (value << 24);
+#if CLANG_OR_GCC_VERSION(4,3)
+ return __builtin_bswap32(value);
+#else
+ return GenericByteSwap32(value);
+#endif
}
static inline constexpr uint64_t
ByteSwap64(uint64_t value)
{
- return uint64_t(ByteSwap32(uint32_t(value >> 32)))
- | (uint64_t(ByteSwap32(value)) << 32);
+#if CLANG_OR_GCC_VERSION(4,3)
+ return __builtin_bswap64(value);
+#else
+ return GenericByteSwap64(value);
+#endif
}
/**