Don't attempt to mask no bits

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42909 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 2e537d66da7f49ce88613a97cda5569a46e32620..c5abf4bf1634d86b9217addf2716c13875092394 100644 (file)
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -2212,7 +2212,8 @@ APInt::tcExtract(integerPart *dst, unsigned int dstCount, const integerPart *src
     dst[dstParts - 1] |= ((src[firstSrcPart + dstParts] & mask)
                           << n % integerPartWidth);
   } else if (n > srcBits) {
-    dst[dstParts - 1] &= lowBitMask (srcBits % integerPartWidth);
+    if (srcBits % integerPartWidth)
+      dst[dstParts - 1] &= lowBitMask (srcBits % integerPartWidth);
   }
 
   /* Clear high parts.  */