diff --git a/llvm/test/tools/llvm-nm/XCOFF/basic.test b/llvm/test/tools/llvm-nm/XCOFF/basic.test
--- a/llvm/test/tools/llvm-nm/XCOFF/basic.test
+++ b/llvm/test/tools/llvm-nm/XCOFF/basic.test
@@ -45,8 +45,8 @@
 # NM-SYM-NEXT: 00000138 t ._Z41__static_initialization_and_destruction_0ii
 # NM-SYM-NEXT: 00000050 T ._Z5func1i
 # NM-SYM-NEXT: 00000000 t ._ZL5func0v
-# NM-SYM-NEXT: 00000294 t ._ZN1CC1Ei
 # NM-SYM-NEXT: 00000294 W ._ZN1CC1Ei
+# NM-SYM-NEXT: 00000294 t ._ZN1CC1Ei
 # NM-SYM-NEXT: 000002f0 d .data
 # NM-SYM-NEXT: 00000000 f .file
 # NM-SYM-NEXT: 00000000 t .text
@@ -57,8 +57,8 @@
 # NM-SYM-NEXT: 0000033c W _Z3fwhv
 # NM-SYM-NEXT: 00000348 W _Z3fwpv
 # NM-SYM-NEXT: 00000354 d _Z41__static_initialization_and_destruction_0ii
-# NM-SYM-NEXT: 00000330 d _Z5func1i
 # NM-SYM-NEXT: 00000330 D _Z5func1i
+# NM-SYM-NEXT: 00000330 d _Z5func1i
 # NM-SYM-NEXT: 0000037c d _ZL2si
 # NM-SYM-NEXT: 00000324 d _ZL5func0v
 # NM-SYM-NEXT: 00000310 W _ZN1CC1Ei
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 +1,50 @@
+## Test llvm-nm for XCOFF object files with --print-size option.
+# RUN: llvm-nm  --print-size %p/Inputs/test_gcc.o | FileCheck --check-prefix=NM-SIZE %s
+
+## test_gcc.o is generated by the following source compiled with g++ in aix os.   
+##  int v = 0;
+## 
+## __attribute__((visibility ("protected"))) int  vp = 1;
+## __attribute__((visibility ("hidden"))) int  vh = 2;
+## __attribute__((visibility ("default"))) int  vd = 3;
+## __attribute__ ((weak)) __attribute__((visibility ("hidden"))) int vwh = 4;
+## __attribute__ ((weak)) __attribute__((visibility ("protected"))) int vwp = 5;
+## 
+## class C {
+## public:
+##  int c;
+##  C(int v):c(v) {}
+## };
+## 
+## C cc(2);
+## 
+## static int si = 6;
+## 
+## static int func0 () {
+##   return vp+si;
+## }
+## 
+## int func1 (int i) {
+##   return func0() * i;
+## }
+## 
+## __attribute__ ((weak)) __attribute__((visibility ("hidden")))
+## int fwh() {
+##   return si+1;
+## }
+## 
+## __attribute__ ((weak)) __attribute__((visibility ("protected")))
+## int fwp() {
+##   return si+2;
+## }
+
+# NM-SIZE:      00000294 00000050 t ._ZN1CC1Ei
+# NM-SIZE-NEXT: 000002f0 00000020 d .data
+# NM-SIZE-NEXT: 00000000 00000000 f .file
+# NM-SIZE-NEXT: 00000000 00000294 t .text
+
+# NM-SIZE:      00000330 00000000 D _Z5func1i
+# NM-SIZE-NEXT: 00000330 0000000c d _Z5func1i
+
+# NM-SIZE:      000002f4 00000000 D vp
+# NM-SIZE-NEXT: 00000378 00000004 d vp
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
@@ -1693,6 +1693,10 @@
       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();