From 6d3465793f45f4d40e24cabf1f5867cc6c0db90a Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 12 Jul 2006 16:59:49 +0000
Subject: [PATCH] Add information preventing several register class constraints
 from working. This implements PR828 and
 CodeGen/X86/2006-07-12-InlineAsmQConstraint.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29118 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d96be87efde..4ebe4caad09 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -4140,7 +4140,15 @@ SDOperand X86TargetLowering::PerformDAGCombine(SDNode *N,
 X86TargetLowering::ConstraintType
 X86TargetLowering::getConstraintType(char ConstraintLetter) const {
   switch (ConstraintLetter) {
-  case 'A': return C_RegisterClass;
+  case 'A':
+  case 'r':
+  case 'R':
+  case 'l':
+  case 'q':
+  case 'Q':
+  case 'x':
+  case 'Y':
+    return C_RegisterClass;
   default: return TargetLowering::getConstraintType(ConstraintLetter);
   }
 }