Handle 'r' inline asm constraint

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79648 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 45 insertions, 0 deletions

diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index 279e22b..2022ec0 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -165,6 +165,46 @@ 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
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Target/SystemZ/SystemZISelLowering.h b/lib/Target/SystemZ/SystemZISelLowering.h
index 0cf0783..0c1d825 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/lib/Target/SystemZ/SystemZISelLowering.h
@@ -69,6 +69,11 @@ namespace llvm {
       return 1;
     }
 
+    std::pair<unsigned, const TargetRegisterClass*>
+    getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
+    TargetLowering::ConstraintType
+    getConstraintType(const std::string &Constraint) const;
+
     SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);