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Make the hashing algorithm Endian neutral. This is a bit annoying, but

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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
This commit is contained in:
Chandler Carruth 2012-03-02 11:16:10 +00:00
parent 1c1448984d
commit dc62a90696
1 changed files with 6 additions and 0 deletions
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6
include/llvm/ADT/Hashing.h
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@ -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 <algorithm>
#include <cassert>
@ -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;
}