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Use unsigned multiply to hash integers, so we don't end up with undefined behavior for large signed integers. Based on patch by Ahmed Charles.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141827 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-10-12 22:25:45 +00:00
parent 68df750a4f
commit a046d2ff9a
1 changed files with 5 additions and 5 deletions
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10
include/llvm/ADT/DenseMapInfo.h
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@ -51,7 +51,7 @@ struct DenseMapInfo<T*> {
template<> struct DenseMapInfo<char> {
static inline char getEmptyKey() { return ~0; }
static inline char getTombstoneKey() { return ~0 - 1; }
static unsigned getHashValue(const char& Val) { return Val * 37; }
static unsigned getHashValue(const char& Val) { return Val * 37U; }
static bool isEqual(const char &LHS, const char &RHS) {
return LHS == RHS;
}
@ -61,7 +61,7 @@ template<> struct DenseMapInfo<char> {
template<> struct DenseMapInfo<unsigned> {
static inline unsigned getEmptyKey() { return ~0; }
static inline unsigned getTombstoneKey() { return ~0U - 1; }
static unsigned getHashValue(const unsigned& Val) { return Val * 37; }
static unsigned getHashValue(const unsigned& Val) { return Val * 37U; }
static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
return LHS == RHS;
}
@ -96,7 +96,7 @@ template<> struct DenseMapInfo<unsigned long long> {
template<> struct DenseMapInfo<int> {
static inline int getEmptyKey() { return 0x7fffffff; }
static inline int getTombstoneKey() { return -0x7fffffff - 1; }
static unsigned getHashValue(const int& Val) { return (unsigned)(Val * 37); }
static unsigned getHashValue(const int& Val) { return (unsigned)(Val * 37U); }
static bool isEqual(const int& LHS, const int& RHS) {
return LHS == RHS;
}
@ -109,7 +109,7 @@ template<> struct DenseMapInfo<long> {
}
static inline long getTombstoneKey() { return getEmptyKey() - 1L; }
static unsigned getHashValue(const long& Val) {
return (unsigned)(Val * 37L);
return (unsigned)(Val * 37UL);
}
static bool isEqual(const long& LHS, const long& RHS) {
return LHS == RHS;
@ -121,7 +121,7 @@ template<> struct DenseMapInfo<long long> {
static inline long long getEmptyKey() { return 0x7fffffffffffffffLL; }
static inline long long getTombstoneKey() { return -0x7fffffffffffffffLL-1; }
static unsigned getHashValue(const long long& Val) {
return (unsigned)(Val * 37LL);
return (unsigned)(Val * 37ULL);
}
static bool isEqual(const long long& LHS,
const long long& RHS) {