Index: lib/Target/Mips/AsmParser/MipsAsmParser.cpp
===================================================================
--- lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -1458,6 +1458,7 @@
   case AsmToken::Minus:
   case AsmToken::Plus:
   case AsmToken::Integer:
+  case AsmToken::Tilde:
   case AsmToken::String: {
     DEBUG(dbgs() << ".. generic integer\n");
     OperandMatchResultTy ResTy = ParseImm(Operands);
@@ -1882,6 +1883,7 @@
   case AsmToken::Minus:
   case AsmToken::Plus:
   case AsmToken::Integer:
+  case AsmToken::Tilde:
   case AsmToken::String:
     break;
   }
Index: test/MC/Mips/mips-expansions.s
===================================================================
--- test/MC/Mips/mips-expansions.s
+++ test/MC/Mips/mips-expansions.s
@@ -8,6 +8,8 @@
 # CHECK: addiu   $6, $zero, -2345    # encoding: [0xd7,0xf6,0x06,0x24]
 # CHECK: lui     $7, 1               # encoding: [0x01,0x00,0x07,0x3c]
 # CHECK: ori     $7, $7, 2           # encoding: [0x02,0x00,0xe7,0x34]
+# CHECK: addiu   $8, $zero, -8       # encoding: [0xf8,0xff,0x08,0x24]
+
 # CHECK: addiu   $4, $zero, 20       # encoding: [0x14,0x00,0x04,0x24]
 # CHECK: lui     $7, 1               # encoding: [0x01,0x00,0x07,0x3c]
 # CHECK: ori     $7, $7, 2           # encoding: [0x02,0x00,0xe7,0x34]
@@ -35,6 +37,7 @@
     li $5,123
     li $6,-2345
     li $7,65538
+    li $8, ~7
 
     la $a0, 20
     la $7,65538
Index: test/MC/Mips/mips1/valid.s
===================================================================
--- test/MC/Mips/mips1/valid.s
+++ test/MC/Mips/mips1/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips2/valid.s
===================================================================
--- test/MC/Mips/mips2/valid.s
+++ test/MC/Mips/mips2/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips3/valid.s
===================================================================
--- test/MC/Mips/mips3/valid.s
+++ test/MC/Mips/mips3/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips32/valid.s
===================================================================
--- test/MC/Mips/mips32/valid.s
+++ test/MC/Mips/mips32/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips32r2/valid.s
===================================================================
--- test/MC/Mips/mips32r2/valid.s
+++ test/MC/Mips/mips32r2/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips4/valid.s
===================================================================
--- test/MC/Mips/mips4/valid.s
+++ test/MC/Mips/mips4/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips5/valid.s
===================================================================
--- test/MC/Mips/mips5/valid.s
+++ test/MC/Mips/mips5/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips64/valid.s
===================================================================
--- test/MC/Mips/mips64/valid.s
+++ test/MC/Mips/mips64/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]
Index: test/MC/Mips/mips64r2/valid.s
===================================================================
--- test/MC/Mips/mips64r2/valid.s
+++ test/MC/Mips/mips64r2/valid.s
@@ -9,6 +9,7 @@
         add.d     $f1,$f7,$f29
         add.s     $f8,$f21,$f24
         addi      $13,$9,26322
+        addi      $8,$8,~1             # CHECK: addi $8, $8, -2 # encoding: [0x21,0x08,0xff,0xfe]
         addu      $9,$a0,$a2
         and       $s7,$v0,$12
         and       $2,4                 # CHECK: andi $2, $2, 4 # encoding: [0x30,0x42,0x00,0x04]