Index: include/llvm/MC/MCParser/MCTargetAsmParser.h
===================================================================
--- include/llvm/MC/MCParser/MCTargetAsmParser.h
+++ include/llvm/MC/MCParser/MCTargetAsmParser.h
@@ -66,11 +66,11 @@
   AsmRewriteKind Kind;
   SMLoc Loc;
   unsigned Len;
-  unsigned Val;
+  int Val;
   StringRef Label;
 
 public:
-  AsmRewrite(AsmRewriteKind kind, SMLoc loc, unsigned len = 0, unsigned val = 0)
+  AsmRewrite(AsmRewriteKind kind, SMLoc loc, unsigned len = 0, int val = 0)
     : Kind(kind), Loc(loc), Len(len), Val(val) {}
   AsmRewrite(AsmRewriteKind kind, SMLoc loc, unsigned len, StringRef label)
     : Kind(kind), Loc(loc), Len(len), Val(0), Label(label) {}
Index: lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -1962,11 +1962,6 @@
     return X86Operand::CreateImm(ImmExpr, Start, End);
   }
 
-  // Only positive immediates are valid.
-  if (Imm < 0)
-    return ErrorOperand(Start, "expected a positive immediate displacement "
-                               "before bracketed expr.");
-
   return ParseIntelBracExpression(/*SegReg=*/0, Start, Imm, isSymbol, Size);
 }