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Add max/min functions to MathExtras.h 

llvm-svn: 271371
This commit is contained in:
Dylan McKay 2016-06-01 07:58:15 +00:00
parent c301c194ec
commit 4b7e150b5a
1 changed files with 9 additions and 2 deletions
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11
llvm/include/llvm/Support/MathExtras.h
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@ -311,16 +311,23 @@ inline bool isShiftedUInt(uint64_t x) {
return isUInt<N+S>(x) && (x % (1<<S) == 0);
}
/// Gets the maximum value for a N-bit unsigned integer.
inline uint64_t maxUIntN(uint64_t N) { return UINT64_C(1) << N; }
/// Gets the minimum value for a N-bit signed integer.
inline int64_t minIntN(int64_t N) { return -(INT64_C(1)<<(N-1)); }
/// Gets the maximum value for a N-bit signed integer.
inline int64_t maxIntN(int64_t N) { return INT64_C(1)<<(N-1); }
/// isUIntN - Checks if an unsigned integer fits into the given (dynamic)
/// bit width.
inline bool isUIntN(unsigned N, uint64_t x) {
return N >= 64 || x < (UINT64_C(1)<<(N));
return N >= 64 || x < maxUIntN(N);
}
/// isIntN - Checks if an signed integer fits into the given (dynamic)
/// bit width.
inline bool isIntN(unsigned N, int64_t x) {
return N >= 64 || (-(INT64_C(1)<<(N-1)) <= x && x < (INT64_C(1)<<(N-1)));
return N >= 64 || (minIntN(N) <= x && x < maxIntN(N));
}
/// isMask_32 - This function returns true if the argument is a non-empty