1 files changed, 11 insertions, 7 deletions
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index a428416..1ee9f7b 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -2337,6 +2337,7 @@ Error BitcodeReader::parseConstants() {
     uint64_t Op0Idx;
     uint64_t Op1Idx;
     uint64_t Op2Idx;
+    unsigned CstNo;
   };
   std::vector<DelayedShufTy> DelayedShuffles;
   while (true) {
@@ -2350,9 +2351,6 @@ Error BitcodeReader::parseConstants() {
     case BitstreamEntry::Error:
       return error("Malformed block");
     case BitstreamEntry::EndBlock:
-      if (NextCstNo != ValueList.size())
-        return error("Invalid constant reference");
-
       // Once all the constants have been read, go through and resolve forward
       // references.
       //
@@ -2365,6 +2363,7 @@ Error BitcodeReader::parseConstants() {
         uint64_t Op0Idx = DelayedShuffle.Op0Idx;
         uint64_t Op1Idx = DelayedShuffle.Op1Idx;
         uint64_t Op2Idx = DelayedShuffle.Op2Idx;
+        uint64_t CstNo = DelayedShuffle.CstNo;
         Constant *Op0 = ValueList.getConstantFwdRef(Op0Idx, OpTy);
         Constant *Op1 = ValueList.getConstantFwdRef(Op1Idx, OpTy);
         Type *ShufTy =
@@ -2375,9 +2374,12 @@ Error BitcodeReader::parseConstants() {
         SmallVector<int, 16> Mask;
         ShuffleVectorInst::getShuffleMask(Op2, Mask);
         Value *V = ConstantExpr::getShuffleVector(Op0, Op1, Mask);
-        ValueList.assignValue(V, NextCstNo, DelayedShuffle.CurFullTy);
-        ++NextCstNo;
+        ValueList.assignValue(V, CstNo, DelayedShuffle.CurFullTy);
       }
+
+      if (NextCstNo != ValueList.size())
+        return error("Invalid constant reference");
+
       ValueList.resolveConstantForwardRefs();
       return Error::success();
     case BitstreamEntry::Record:
@@ -2733,7 +2735,8 @@ Error BitcodeReader::parseConstants() {
       if (Record.size() < 3 || !OpTy)
         return error("Invalid record");
       DelayedShuffles.push_back(
-          {OpTy, OpTy, CurFullTy, Record[0], Record[1], Record[2]});
+          {OpTy, OpTy, CurFullTy, Record[0], Record[1], Record[2], NextCstNo});
+      ++NextCstNo;
       continue;
     }
     case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval]
@@ -2743,7 +2746,8 @@ Error BitcodeReader::parseConstants() {
       if (Record.size() < 4 || !RTy || !OpTy)
         return error("Invalid record");
       DelayedShuffles.push_back(
-          {OpTy, RTy, CurFullTy, Record[1], Record[2], Record[3]});
+          {OpTy, RTy, CurFullTy, Record[1], Record[2], Record[3], NextCstNo});
+      ++NextCstNo;
       continue;
     }
     case bitc::CST_CODE_CE_CMP: {     // CE_CMP: [opty, opval, opval, pred]