From dc62a9069648e86846f9f5a8eed7ad29de6f4163 Mon Sep 17 00:00:00 2001 From: Chandler Carruth Date: Fri, 2 Mar 2012 11:16:10 +0000 Subject: [PATCH] Make the hashing algorithm Endian neutral. This is a bit annoying, but folks who know something about PPC tell me that the byte swap is crazy fast and without this the bit mixture would actually be different. It might not be worse, but I've not measured it and so I'd rather not trust it. This way, the algorithm is identical on both endianness hosts. I'll look into any performance issues etc stemming from this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151892 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/ADT/Hashing.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/llvm/ADT/Hashing.h b/include/llvm/ADT/Hashing.h index 7fbe5bb0ca2..2c270e4ffc5 100644 --- a/include/llvm/ADT/Hashing.h +++ b/include/llvm/ADT/Hashing.h @@ -47,6 +47,8 @@ #include "llvm/ADT/STLExtras.h" #include "llvm/Support/DataTypes.h" +#include "llvm/Support/Host.h" +#include "llvm/Support/SwapByteOrder.h" #include "llvm/Support/type_traits.h" #include #include @@ -149,12 +151,16 @@ namespace detail { inline uint64_t fetch64(const char *p) { uint64_t result; memcpy(&result, p, sizeof(result)); + if (sys::isBigEndianHost()) + return sys::SwapByteOrder(result); return result; } inline uint32_t fetch32(const char *p) { uint32_t result; memcpy(&result, p, sizeof(result)); + if (sys::isBigEndianHost()) + return sys::SwapByteOrder(result); return result; }