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Add an isNegative method to determine if the APInt's value is negative.

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This is much less expensive than a test against zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34619 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2007-02-26 01:20:59 +00:00
parent ba81c2b871
commit dcffd5c3d9
1 changed files with 7 additions and 0 deletions
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7
include/llvm/ADT/APInt.h
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@@ -352,6 +352,13 @@ public:
return !slt(RHS); return !slt(RHS);
} }
/// This just tests the high bit of this APInt to determine if it is negative.
/// @returns true if this APInt is negative, false otherwise
/// @brief Determine sign of this APInt.
bool isNegative() {
return (*this)[BitWidth - 1];
}
/// Arithmetic right-shift this APInt by shiftAmt. /// Arithmetic right-shift this APInt by shiftAmt.
/// @brief Arithmetic right-shift function. /// @brief Arithmetic right-shift function.
APInt ashr(uint32_t shiftAmt) const; APInt ashr(uint32_t shiftAmt) const;