diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
@@ -166,10 +166,15 @@
 
 // A hook for emitting stuff at the end.
 // We use it for emitting the accumulated PAL metadata as directives.
+// The PAL metadata is reset after it is emitted.
 void AMDGPUTargetAsmStreamer::finish() {
   std::string S;
   getPALMetadata()->toString(S);
   OS << S;
+
+  // Reset the pal metadata so is data will not affect a compilation that reuses
+  // this object.
+  getPALMetadata()->reset();
 }
 
 void AMDGPUTargetAsmStreamer::EmitDirectiveAMDGCNTarget(StringRef Target) {
@@ -421,6 +426,7 @@
 
 // A hook for emitting stuff at the end.
 // We use it for emitting the accumulated PAL metadata as a .note record.
+// The PAL metadata is reset after it is emitted.
 void AMDGPUTargetELFStreamer::finish() {
   std::string Blob;
   const char *Vendor = getPALMetadata()->getVendor();
@@ -430,6 +436,10 @@
     return;
   EmitNote(Vendor, MCConstantExpr::create(Blob.size(), getContext()), Type,
            [&](MCELFStreamer &OS) { OS.emitBytes(Blob); });
+
+  // Reset the pal metadata so is data will not affect a compilation that reuses
+  // this object.
+  getPALMetadata()->reset();
 }
 
 void AMDGPUTargetELFStreamer::EmitNote(
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.h b/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.h
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.h
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.h
@@ -106,6 +106,9 @@
   // Set legacy PAL metadata format.
   void setLegacy();
 
+  // Erase all PAL metadata.
+  void reset();
+
 private:
   // Return whether the blob type is legacy PAL metadata.
   bool isLegacy() const;
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.cpp
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUPALMetadata.cpp
@@ -773,3 +773,9 @@
   BlobType = ELF::NT_AMD_AMDGPU_PAL_METADATA;
 }
 
+// Erase all PAL metadata.
+void AMDGPUPALMetadata::reset() {
+  MsgPackDoc.clear();
+  Registers = MsgPackDoc.getEmptyNode();
+  HwStages = MsgPackDoc.getEmptyNode();
+}