From d654cf39774eb4710f837029df3d878b05e1eb85 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 14 Sep 2010 23:38:48 +0000
Subject: [PATCH] Approved by Chris

$ svn merge -c 113894 https://llvm.org/svn/llvm-project/llvm/trunk
--- Merging r113894 into '.':
U    test/MC/AsmParser/X86/x86_instructions.s
U    lib/Target/X86/AsmParser/X86AsmParser.cpp

Log:
add a terrible hack to allow out with dx is parens, a gas bug.
This fixes PR8114



git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_28@113896 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/AsmParser/X86AsmParser.cpp | 14 ++++++++++++++
 test/MC/AsmParser/X86/x86_instructions.s  |  9 +++++++++
 2 files changed, 23 insertions(+)

diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index b4542a03aa9..f8588d818b7 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -815,6 +815,20 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
     Operands.erase(Operands.begin() + 1);
   }
 
+  // FIXME: Hack to handle "out[bwl]? %al, (%dx)" -> "outb %al, %dx".
+  if ((Name == "outb" || Name == "outw" || Name == "outl" || Name == "out") &&
+      Operands.size() == 3) {
+    X86Operand &Op = *(X86Operand*)Operands.back();
+    if (Op.isMem() && Op.Mem.SegReg == 0 &&
+        isa<MCConstantExpr>(Op.Mem.Disp) &&
+        cast<MCConstantExpr>(Op.Mem.Disp)->getValue() == 0 &&
+        Op.Mem.BaseReg == MatchRegisterName("dx") && Op.Mem.IndexReg == 0) {
+      SMLoc Loc = Op.getEndLoc();
+      Operands.back() = X86Operand::CreateReg(Op.Mem.BaseReg, Loc, Loc);
+      delete &Op;
+    }
+  }
+  
   // FIXME: Hack to handle "f{mul*,add*,sub*,div*} $op, st(0)" the same as
   // "f{mul*,add*,sub*,div*} $op"
   if ((Name.startswith("fmul") || Name.startswith("fadd") ||
diff --git a/test/MC/AsmParser/X86/x86_instructions.s b/test/MC/AsmParser/X86/x86_instructions.s
index 5d7fff9bbca..a82d2a1c0d4 100644
--- a/test/MC/AsmParser/X86/x86_instructions.s
+++ b/test/MC/AsmParser/X86/x86_instructions.s
@@ -164,3 +164,12 @@ imul $12, %eax
 
 // CHECK: imull %ecx, %eax
 imull %ecx, %eax
+
+// PR8114
+// CHECK: outb	%al, %dx
+// CHECK: outw	%ax, %dx
+// CHECK: outl	%eax, %dx
+
+out %al, (%dx)
+out %ax, (%dx)
+outl %eax, (%dx)