From e2d6008d2e13a3265d0939d02d2c963c5b940704 Mon Sep 17 00:00:00 2001
From: Artyom Skrobov <Artyom.Skrobov@arm.com>
Date: Sat, 14 Jun 2014 12:52:55 +0000
Subject: [PATCH] Adding llvm::sys::swapByteOrder() for the common use-case of
 byte-swapping a value in place

llvm-svn: 210976
---
 llvm/include/llvm/Support/SwapByteOrder.h    |  5 +++
 llvm/unittests/Support/SwapByteOrderTest.cpp | 48 ++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/llvm/include/llvm/Support/SwapByteOrder.h b/llvm/include/llvm/Support/SwapByteOrder.h
index 468a8235..340954f 100644
--- a/llvm/include/llvm/Support/SwapByteOrder.h
+++ b/llvm/include/llvm/Support/SwapByteOrder.h
@@ -95,6 +95,11 @@ inline signed long long getSwappedBytes(signed long long C) {
   return SwapByteOrder_64(C);
 }
 
+template<typename T>
+inline void swapByteOrder(T &Value) {
+  Value = getSwappedBytes(Value);
+}
+
 } // end namespace sys
 } // end namespace llvm
 
diff --git a/llvm/unittests/Support/SwapByteOrderTest.cpp b/llvm/unittests/Support/SwapByteOrderTest.cpp
index a07282e..525cfc1 100644
--- a/llvm/unittests/Support/SwapByteOrderTest.cpp
+++ b/llvm/unittests/Support/SwapByteOrderTest.cpp
@@ -125,4 +125,52 @@ TEST(getSwappedBytes, int64_t) {
     sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
 }
 
+TEST(swapByteOrder, uint8_t) {
+  uint8_t value = 0x11;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(uint8_t(0x11), value);
+}
+
+TEST(swapByteOrder, uint16_t) {
+  uint16_t value = 0x2211;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(uint16_t(0x1122), value);
+}
+
+TEST(swapByteOrder, uint32_t) {
+  uint32_t value = 0x44332211;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(uint32_t(0x11223344), value);
+}
+
+TEST(swapByteOrder, uint64_t) {
+  uint64_t value = 0x8877665544332211ULL;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
+}
+
+TEST(swapByteOrder, int8_t) {
+  int8_t value = 0x11;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(int8_t(0x11), value);
+}
+
+TEST(swapByteOrder, int16_t) {
+  int16_t value = 0x2211;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(int16_t(0x1122), value);
+}
+
+TEST(swapByteOrder, int32_t) {
+  int32_t value = 0x44332211;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(int32_t(0x11223344), value);
+}
+
+TEST(swapByteOrder, int64_t) {
+  int64_t value = 0x8877665544332211LL;
+  sys::swapByteOrder(value);
+  EXPECT_EQ(int64_t(0x1122334455667788LL), value);
+}
+
 }
-- 
2.7.4