1 files changed, 9 insertions, 1 deletions

diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 3bce3f3ed3f3..6a6384aa3f43 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -2344,13 +2344,21 @@ APInt::tcExtractBit(const integerPart *parts, unsigned int bit)
          & ((integerPart) 1 << bit % integerPartWidth)) != 0;
 }
 
-/* Set the given bit of a bignum.  */
+/* Set the given bit of a bignum. */
 void
 APInt::tcSetBit(integerPart *parts, unsigned int bit)
 {
   parts[bit / integerPartWidth] |= (integerPart) 1 << (bit % integerPartWidth);
 }
 
+/* Clears the given bit of a bignum. */
+void
+APInt::tcClearBit(integerPart *parts, unsigned int bit)
+{
+  parts[bit / integerPartWidth] &=
+    ~((integerPart) 1 << (bit % integerPartWidth));
+}
+
 /* Returns the bit number of the least significant set bit of a
    number.  If the input number has no bits set -1U is returned.  */
 unsigned int