diff --git a/llvm/test/tools/llvm-nm/XCOFF/size.test b/llvm/test/tools/llvm-nm/XCOFF/size.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-nm/XCOFF/size.test
@@ -0,0 +1,23 @@
+## Test llvm-nm for XCOFF object files with --print-size option.
+# RUN: llvm-nm  --print-size %p/Inputs/test_xlclang.o | FileCheck --check-prefix=NM-SIZE %s
+
+## test_xlclang.o is generated by the following source compiled with IBM xlclang++ in aix os.
+## int value = 0;
+##
+## __attribute__ ((weak))  int weak_value = 5;
+##
+## static int func0 () {
+##   return value;
+## }
+##
+## int func1 (int i) {
+##   return func0() * i;
+## }
+
+#NM-SIZE:      0000104 00000004 d _Z5func1i
+#NM-SIZE-NEXT: 0000010c 0000000c D _Z5func1i
+#NM-SIZE-NEXT: 00000100 00000004 d value
+#NM-SIZE-NEXT: 00000118 00000004 D value
+#NM-SIZE-NEXT: 00000108 00000004 d weak_value
+#NM-SIZE-NEXT: 0000011c 00000004 W weak_value
+~
diff --git a/llvm/tools/llvm-nm/llvm-nm.cpp b/llvm/tools/llvm-nm/llvm-nm.cpp
--- a/llvm/tools/llvm-nm/llvm-nm.cpp
+++ b/llvm/tools/llvm-nm/llvm-nm.cpp
@@ -1694,6 +1694,11 @@
       S.Address = 0;
       if (isa<ELFObjectFileBase>(&Obj))
         S.Size = ELFSymbolRef(Sym).getSize();
+
+      if (const XCOFFObjectFile *XCOFFObj =
+              dyn_cast<const XCOFFObjectFile>(&Obj))
+        S.Size = XCOFFObj->getSymbolSize(Sym.getRawDataRefImpl());
+
       if (PrintAddress && isa<ObjectFile>(Obj)) {
         SymbolRef SymRef(Sym);
         Expected<uint64_t> AddressOrErr = SymRef.getAddress();