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Switch this code to use hash_combine_range rather than incremental calls 

to hash_combine. One of the interfaces could already do this, and the
other can just use a small buffer. This is a much more efficient way to
use the hash_combine interface, although I don't have any particular
benchmark where this code was hot, so I can't measure much of an impact.
It at least doesn't slow anything down.

llvm-svn: 152200
This commit is contained in:
Chandler Carruth 2012-03-07 03:22:32 +00:00
parent a269ac0bca
commit d4ba3eb480
1 changed files with 6 additions and 8 deletions
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14
llvm/lib/VMCore/ConstantsContext.h
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@ -657,20 +657,18 @@ private:
return ConstantClassInfo::getTombstoneKey();
}
static unsigned getHashValue(const ConstantClass *CP) {
hash_code code = hash_value(CP->getType());
SmallVector<Constant*, 8> CPOperands;
CPOperands.reserve(CP->getNumOperands());
for (unsigned I = 0, E = CP->getNumOperands(); I < E; ++I)
code = hash_combine(code, hash_value(CP->getOperand(I)));
return code;
CPOperands.push_back(CP->getOperand(I));
return getHashValue(LookupKey(CP->getType(), CPOperands));
}
static bool isEqual(const ConstantClass *LHS, const ConstantClass *RHS) {
return LHS == RHS;
}
static unsigned getHashValue(const LookupKey &Val) {
hash_code code = hash_value(Val.first);
for (Operands::const_iterator
I = Val.second.begin(), E = Val.second.end(); I != E; ++I)
code = hash_combine(code, hash_value(*I));
return code;
return hash_combine(Val.first, hash_combine_range(Val.second.begin(),
Val.second.end()));
}
static bool isEqual(const LookupKey &LHS, const ConstantClass *RHS) {
if (RHS == getEmptyKey() || RHS == getTombstoneKey())