MC: Avoid some UB caused by left shifting a negative value. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237408 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/MC/MachObjectWriter.cpp b/lib/MC/MachObjectWriter.cpp
index dc68a89e6ea9eca17e4b306c30842b527a5415b5..248775c625e423f99b0f6a83695c7165bcda5470 100644 (file)
--- a/lib/MC/MachObjectWriter.cpp
+++ b/lib/MC/MachObjectWriter.cpp
@@ -637,7 +637,7 @@ void MachObjectWriter::ComputeSymbolTable(
       unsigned Index = Rel.Sym->getIndex();
       assert(isInt<24>(Index));
       if (IsLittleEndian)
-        Rel.MRE.r_word1 = (Rel.MRE.r_word1 & (-1 << 24)) | Index | (1 << 27);
+        Rel.MRE.r_word1 = (Rel.MRE.r_word1 & (~0U << 24)) | Index | (1 << 27);
       else
         Rel.MRE.r_word1 = (Rel.MRE.r_word1 & 0xff) | Index << 8 | (1 << 4);
     }