AsmWriter/Bitcode: MDSubrange

llvm-svn: 229003

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index f64cd55..f781581 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1173,6 +1173,8 @@ std::error_code BitcodeReader::ParseValueSymbolTable() {
   }
 }
 
+static int64_t unrotateSign(uint64_t U) { return U & 1 ? ~(U >> 1) : U >> 1; }
+
 std::error_code BitcodeReader::ParseMetadata() {
   unsigned NextMDValueNo = MDValueList.size();
 
@@ -1349,6 +1351,16 @@ std::error_code BitcodeReader::ParseMetadata() {
                               NextMDValueNo++);
       break;
     }
+    case bitc::METADATA_SUBRANGE: {
+      if (Record.size() != 3)
+        return Error("Invalid record");
+
+      MDValueList.AssignValue(
+          GET_OR_DISTINCT(MDSubrange, Record[0],
+                          (Context, Record[1], unrotateSign(Record[2]))),
+          NextMDValueNo++);
+      break;
+    }
     case bitc::METADATA_STRING: {
       std::string String(Record.begin(), Record.end());
       llvm::UpgradeMDStringConstant(String);