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Fix off-by-one error in max integer functions

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I recently added these functions, but implemented them poorly. This
fixes that.

Sorry for the spam.

llvm-svn: 271380
This commit is contained in:
Dylan McKay 2016-06-01 11:15:25 +00:00
parent 5850144e1e
commit f554c4db6a
1 changed files with 4 additions and 4 deletions
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8
include/llvm/Support/MathExtras.h
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@ -312,22 +312,22 @@ inline bool isShiftedUInt(uint64_t x) {
}
/// Gets the maximum value for a N-bit unsigned integer.
inline uint64_t maxUIntN(uint64_t N) { return UINT64_C(1) << N; }
inline uint64_t maxUIntN(uint64_t N) { return (UINT64_C(1) << N) - 1; }
/// 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); }
inline int64_t maxIntN(int64_t N) { return (INT64_C(1)<<(N-1)) - 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 < maxUIntN(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 || (minIntN(N) <= x && x < maxIntN(N));
return N >= 64 || (minIntN(N) <= x && x <= maxIntN(N));
}
/// isMask_32 - This function returns true if the argument is a non-empty