diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
index 6ed0513ac15f..ed8a1871a1f5 100644
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -377,6 +377,11 @@ bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
         return true;
       O << MO.getImm();
       return false;
+    case 'm': // decimal const int minus 1
+      if ((MO.getType()) != MachineOperand::MO_Immediate)
+        return true;
+      O << MO.getImm() - 1;
+      return false;
     }
   }
 
diff --git a/llvm/test/CodeGen/Mips/inlineasm-operand-code.ll b/llvm/test/CodeGen/Mips/inlineasm-operand-code.ll
index 92abf84cc7e9..2dcc10def2f5 100644
--- a/llvm/test/CodeGen/Mips/inlineasm-operand-code.ll
+++ b/llvm/test/CodeGen/Mips/inlineasm-operand-code.ll
@@ -23,5 +23,11 @@ entry:
 ;CHECK:	#NO_APP
   tail call i32 asm sideeffect "addi $0,$1,${2:d}", "=r,r,I"(i32 7, i32 -3) nounwind
 
+; m with -3
+;CHECK:	#APP
+;CHECK:	addi ${{[0-9]+}},${{[0-9]+}},-4
+;CHECK:	#NO_APP
+  tail call i32 asm sideeffect "addi $0,$1,${2:m}", "=r,r,I"(i32 7, i32 -3) nounwind
+
   ret i32 0
 }