Fix Whitespace.

[oota-llvm.git] / include / llvm / Support / MathExtras.h

diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index 9c5f32cd5ff2fc27534a702bd00842cdf66bd9a6..982813f7186ffda9fb8dae8a315cfea8f986eb5e 100644 (file)
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -126,7 +126,8 @@ inline uint16_t ByteSwap_16(uint16_t Value) {
 /// ByteSwap_32 - This function returns a byte-swapped representation of the
 /// 32-bit argument, Value.
 inline uint32_t ByteSwap_32(uint32_t Value) {
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
+#if defined(__llvm__) || \
+    (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
   return __builtin_bswap32(Value);
 #elif defined(_MSC_VER) && !defined(_DEBUG)
   return _byteswap_ulong(Value);
@@ -142,7 +143,8 @@ inline uint32_t ByteSwap_32(uint32_t Value) {
 /// ByteSwap_64 - This function returns a byte-swapped representation of the
 /// 64-bit argument, Value.
 inline uint64_t ByteSwap_64(uint64_t Value) {
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
+#if defined(__llvm__) || \
+    (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
   return __builtin_bswap64(Value);
 #elif defined(_MSC_VER) && !defined(_DEBUG)
   return _byteswap_uint64(Value);
@@ -457,6 +459,18 @@ inline int64_t abs64(int64_t x) {
   return (x < 0) ? -x : x;
 }
 
+/// SignExtend32 - Sign extend B-bit number x to 32-bit int.
+/// Usage int32_t r = SignExtend32<5>(x);
+template <unsigned B> inline int32_t SignExtend32(uint32_t x) {
+  return int32_t(x << (32 - B)) >> (32 - B);
+}
+
+/// SignExtend64 - Sign extend B-bit number x to 64-bit int.
+/// Usage int64_t r = SignExtend64<5>(x);
+template <unsigned B> inline int64_t SignExtend64(uint64_t x) {
+  return int64_t(x << (64 - B)) >> (64 - B);
+}
+
 } // End llvm namespace
 
 #endif