[ConstantRange] Fix a couple cases where we were possibly throwing away an APInt allocation we could reuse. NFC

This uses setAllBits to replace getMaxValue and operator=(uint64_t) instead of constructing an APInt from uint64_t.

llvm-svn: 301761

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/IR/ConstantRange.cpp b/llvm/lib/IR/ConstantRange.cpp
index 4d7e73eb07f..5425676e4ed 100644
--- a/llvm/lib/IR/ConstantRange.cpp
+++ b/llvm/lib/IR/ConstantRange.cpp
@@ -581,7 +581,7 @@ ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
       return ConstantRange(DstTySize, /*isFullSet=*/true);
 
     Union = ConstantRange(APInt::getMaxValue(DstTySize),Upper.trunc(DstTySize));
-    UpperDiv = APInt::getMaxValue(getBitWidth());
+    UpperDiv.setAllBits();
 
     // Union covers the MaxValue case, so return if the remaining range is just
     // MaxValue.
@@ -837,7 +837,7 @@ ConstantRange::udiv(const ConstantRange &RHS) const {
     if (RHS.getUpper() == 1)
       RHS_umin = RHS.getLower();
     else
-      RHS_umin = APInt(getBitWidth(), 1);
+      RHS_umin = 1;
   }
 
   APInt Upper = getUnsignedMax().udiv(RHS_umin) + 1;