Index: lib/Target/Mips/AsmParser/MipsAsmParser.cpp
===================================================================
--- lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -1748,6 +1748,9 @@
     tmpInst.addOperand(MCOperand::CreateImm(ImmValue));
     Instructions.push_back(tmpInst);
   } else if ((ImmValue & 0xffffffff) == ImmValue) {
+    if (!AssemblerOptions.back()->isMacro())
+      Warning(IDLoc, "macro instruction expanded into multiple instructions");
+
     // For all other values which are representable as a 32-bit integer:
     // li d,j => lui d,hi16(j)
     //           ori d,d,lo16(j)
@@ -1764,6 +1767,8 @@
       Error(IDLoc, "instruction requires a 32-bit immediate");
       return true;
     }
+    if (!AssemblerOptions.back()->isMacro())
+      Warning(IDLoc, "macro instruction expanded into multiple instructions");
 
     //            <-------  lo32 ------>
     // <-------  hi32 ------>
@@ -1793,6 +1798,8 @@
       Error(IDLoc, "instruction requires a 32-bit immediate");
       return true;
     }
+    if (!AssemblerOptions.back()->isMacro())
+      Warning(IDLoc, "macro instruction expanded into multiple instructions");
 
     // <-------  hi32 ------> <-------  lo32 ------>
     // <- hi16 ->                        <- lo16 ->
@@ -1856,6 +1863,9 @@
     tmpInst.addOperand(MCOperand::CreateImm(ImmValue));
     Instructions.push_back(tmpInst);
   } else {
+    if (!AssemblerOptions.back()->isMacro())
+      Warning(IDLoc, "macro instruction expanded into multiple instructions");
+
     // For any other value of j that is representable as a 32-bit integer.
     // la d,j(s) => lui d,hi16(j)
     //              ori d,d,lo16(j)
@@ -1903,6 +1913,9 @@
     tmpInst.addOperand(MCOperand::CreateImm(ImmValue));
     Instructions.push_back(tmpInst);
   } else {
+    if (!AssemblerOptions.back()->isMacro())
+      Warning(IDLoc, "macro instruction expanded into multiple instructions");
+
     // For any other value of j that is representable as a 32-bit integer.
     // la d,j => lui d,hi16(j)
     //           ori d,d,lo16(j)
@@ -1923,6 +1936,9 @@
 void
 MipsAsmParser::expandLoadAddressSym(MCInst &Inst, SMLoc IDLoc,
                                     SmallVectorImpl<MCInst> &Instructions) {
+  if (!AssemblerOptions.back()->isMacro())
+    Warning(IDLoc, "macro instruction expanded into multiple instructions");
+
   // FIXME: If we do have a valid at register to use, we should generate a
   // slightly shorter sequence here.
   MCInst tmpInst;
Index: test/MC/Mips/set-nomacro-micromips.s
===================================================================
--- /dev/null
+++ test/MC/Mips/set-nomacro-micromips.s
@@ -0,0 +1,33 @@
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 -mattr=micromips 2>&1 | FileCheck %s
+
+  .text
+  .type main, @function
+  .set micromips
+main:
+# CHECK-NOT: warning: macro instruction expanded into multiple instructions
+  .set macro
+  b 132
+  b 1332
+  b bar
+
+  lwm $16, $17, 8($sp)
+  swm $16, $17, 8($sp)
+
+  add $4, $5, $6
+
+  .set noreorder
+  .set nomacro
+  b 132
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  b 1332
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  b bar
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+
+  lwm $16, $17, 8($sp)
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  swm $16, $17, 8($sp)
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+
+  add $4, $5, $6
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
Index: test/MC/Mips/set-nomacro.s
===================================================================
--- /dev/null
+++ test/MC/Mips/set-nomacro.s
@@ -0,0 +1,46 @@
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 2>&1 | FileCheck %s
+
+# CHECK-NOT: warning: macro instruction expanded into multiple instructions
+  .set macro
+  li  $8, -16
+  li  $8, 16
+  li  $8, 161616
+
+  la  $8, 16
+  la  $8, 161616
+  la  $8, 16($9)
+  la  $8, 161616($9)
+  la  $8, symbol
+
+  jal $25
+  jal $4, $25
+
+  add $4, $5, $6
+
+  .set noreorder
+  .set nomacro
+  li  $8, -16
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  li  $8, 16
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  li  $8, 161616
+# CHECK: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+
+  la  $8, 16
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  la  $8, 161616
+# CHECK: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  la  $8, 16($9)
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  la  $8, 161616($9)
+# CHECK: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  la  $8, symbol
+# CHECK: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+
+  jal $25
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+  jal $4, $25
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions
+
+  add $4, $5, $6
+# CHECK-NOT: [[@LINE-1]]:3: warning: macro instruction expanded into multiple instructions