Make the results for the rotate functions correct when rotateAmt == 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37026 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 3501774967..c8c3c24627 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -1249,6 +1249,8 @@ APInt APInt::shl(uint32_t shiftAmt) const {
 }
 
 APInt APInt::rotl(uint32_t rotateAmt) const {
+  if (rotateAmt == 0)
+    return *this;
   // Don't get too fancy, just use existing shift/or facilities
   APInt hi(*this);
   APInt lo(*this);
@@ -1258,6 +1260,8 @@ APInt APInt::rotl(uint32_t rotateAmt) const {
 }
 
 APInt APInt::rotr(uint32_t rotateAmt) const {
+  if (rotateAmt == 0)
+    return *this;
   // Don't get too fancy, just use existing shift/or facilities
   APInt hi(*this);
   APInt lo(*this);