From 67cd357fb8392e33d04f311f9e74f260ca90e26c Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 4 Nov 2007 06:51:12 +0000
Subject: [PATCH] Fix PR1763 by allowing the 'q' constraint to work with 64-bit
 regs on x86-64.

llvm-svn: 43669
---
 lib/Target/X86/X86ISelLowering.cpp                 | 4 +++-
 test/CodeGen/X86/2007-11-03-x86-64-q-constraint.ll | 9 +++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 test/CodeGen/X86/2007-11-03-x86-64-q-constraint.ll

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index dc9cf99fde6..58004f0201e 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5708,7 +5708,9 @@ getRegClassForInlineAsmConstraint(const std::string &Constraint,
         return make_vector<unsigned>(X86::AX, X86::DX, X86::CX, X86::BX, 0);
       else if (VT == MVT::i8)
         return make_vector<unsigned>(X86::AL, X86::DL, X86::CL, X86::BL, 0);
-        break;
+      else if (VT == MVT::i64)
+        return make_vector<unsigned>(X86::RAX, X86::RDX, X86::RCX, X86::RBX, 0);
+      break;
     }
   }
 
diff --git a/test/CodeGen/X86/2007-11-03-x86-64-q-constraint.ll b/test/CodeGen/X86/2007-11-03-x86-64-q-constraint.ll
new file mode 100644
index 00000000000..ffa6e44d1cb
--- /dev/null
+++ b/test/CodeGen/X86/2007-11-03-x86-64-q-constraint.ll
@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | llc
+; PR1763
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @yield() {
+        %tmp9 = call i64 asm sideeffect "xchgb ${0:b},$1", "=q,*m,0,~{dirflag},~{fpsr},~{flags},~{memory}"( i64* null, i64 0 )   ; <i64>
+        ret void
+}