git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132537
91177308-0d34-0410-b5e6-
96231b3b80d8
/// canFitInBitfield - Return true if the number of bits is large enough to hold
/// the integer value.
static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
/// canFitInBitfield - Return true if the number of bits is large enough to hold
/// the integer value.
static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
- if (Value >= 0) {
- if (Value & ~((1LL << NumBits) - 1))
- return false;
- } else if ((Value >> NumBits) != -1 || (Value & (1LL << (NumBits-1))) == 0) {
- return false;
- }
-
- return true;
+ // For example, with NumBits == 4, we permit Values from [-7 .. 15].
+ return (NumBits >= sizeof(Value) * 8) ||
+ (Value >> NumBits == 0) || (Value >> (NumBits-1) == -1);
}
/// convertValue from Int initializer to bits type: Split the integer up into the
}
/// convertValue from Int initializer to bits type: Split the integer up into the