[llvm-commits] CVS: llvm/include/llvm/ADT/APInt.h

[Reid Spencer]

Changes in directory llvm/include/llvm/ADT:

APInt.h updated: 1.19 -> 1.20
---
Log message:

Add an isNegative method to determine if the APInt's value is negative. 
This is much less expensive than a test against zero.


---
Diffs of the changes:  (+7 -0)

 APInt.h |    7 +++++++
 1 files changed, 7 insertions(+)


Index: llvm/include/llvm/ADT/APInt.h
diff -u llvm/include/llvm/ADT/APInt.h:1.19 llvm/include/llvm/ADT/APInt.h:1.20
--- llvm/include/llvm/ADT/APInt.h:1.19	Sun Feb 25 13:26:01 2007
+++ llvm/include/llvm/ADT/APInt.h	Sun Feb 25 19:20:59 2007
@@ -352,6 +352,13 @@
     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.
   /// @brief Arithmetic right-shift function.
   APInt ashr(uint32_t shiftAmt) const;