Changes in directory llvm/include/llvm/Support:
MathExtras.h updated: 1.27 -> 1.28
---
Log message:
Add bswap intrinsics as documented in the Language Reference
---
Diffs of the changes: (+26 -0)
MathExtras.h | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+)
Index: llvm/include/llvm/Support/MathExtras.h
diff -u llvm/include/llvm/Support/MathExtras.h:1.27
llvm/include/llvm/Support/MathExtras.h:1.28
--- llvm/include/llvm/Support/MathExtras.h:1.27 Fri Oct 7 00:29:25 2005
+++ llvm/include/llvm/Support/MathExtras.h Fri Jan 13 19:25:24 2006
@@ -79,6 +79,32 @@
return Value && !(Value & (Value - 1LL));
}
+// ByteSwap_16 - This function returns a byte-swapped representation of the
+// 16-bit argument, Value.
+inline unsigned short ByteSwap_16(unsigned short Value) {
+ unsigned short Hi = Value << 8;
+ unsigned short Lo = Value >> 8;
+ return Hi | Lo;
+}
+
+// ByteSwap_32 - This function returns a byte-swapped representation of the
+// 32-bit argument, Value.
+inline unsigned ByteSwap_32(unsigned Value) {
+ unsigned Byte0 = Value & 0x000000FF;
+ unsigned Byte1 = Value & 0x0000FF00;
+ unsigned Byte2 = Value & 0x00FF0000;
+ unsigned Byte3 = Value & 0xFF000000;
+ return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
+}
+
+// ByteSwap_64 - This function returns a byte-swapped representation of the
+// 64-bit argument, Value.
+inline uint64_t ByteSwap_64(uint64_t Value) {
+ uint64_t Hi = ByteSwap_32(Value);
+ uint64_t Lo = ByteSwap_32(Value >> 32);
+ return (Hi << 32) | Lo;
+}
+
// CountLeadingZeros_32 - this function performs the platform optimal form of
// counting the number of zeros from the most significant bit to the first one
// bit. Ex. CountLeadingZeros_32(0x00F000FF) == 8.
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