Handle 'r' inline asm constraint

[oota-llvm.git] / lib / Target / SystemZ / SystemZISelLowering.cpp

diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index 279e22b653310f6d4e3500b86472cf95fda0d4f0..2022ec04ce23a739cc63e98911356090625637da 100644 (file)
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -164,6 +164,46 @@ SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
   }
 }
 
+//===----------------------------------------------------------------------===//
+//                       SystemZ Inline Assembly Support
+//===----------------------------------------------------------------------===//
+
+/// getConstraintType - Given a constraint letter, return the type of
+/// constraint it is for this target.
+TargetLowering::ConstraintType
+SystemZTargetLowering::getConstraintType(const std::string &Constraint) const {
+  if (Constraint.size() == 1) {
+    switch (Constraint[0]) {
+    case 'r':
+      return C_RegisterClass;
+    default:
+      break;
+    }
+  }
+  return TargetLowering::getConstraintType(Constraint);
+}
+
+std::pair<unsigned, const TargetRegisterClass*>
+SystemZTargetLowering::
+getRegForInlineAsmConstraint(const std::string &Constraint,
+                             EVT VT) const {
+  if (Constraint.size() == 1) {
+    // GCC Constraint Letters
+    switch (Constraint[0]) {
+    default: break;
+    case 'r':   // GENERAL_REGS
+      if (VT == MVT::i32)
+        return std::make_pair(0U, SystemZ::GR32RegisterClass);
+      else if (VT == MVT::i128)
+        return std::make_pair(0U, SystemZ::GR128RegisterClass);
+
+      return std::make_pair(0U, SystemZ::GR64RegisterClass);
+    }
+  }
+
+  return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
+}
+
 //===----------------------------------------------------------------------===//
 //                      Calling Convention Implementation
 //===----------------------------------------------------------------------===//