From ddc787dfdc75fb2d78eb3e5793ca0f417ad74fd3 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 31 Jan 2006 19:20:21 +0000
Subject: [PATCH] add info about the inline asm register constraints for PPC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25853 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCISelLowering.cpp | 56 ++++++++++++++++++++++++++
 lib/Target/PowerPC/PPCISelLowering.h   |  4 ++
 2 files changed, 60 insertions(+)

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index c4f6be81af2..8b5546d62cd 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -20,6 +20,7 @@
 #include "llvm/CodeGen/SSARegMap.h"
 #include "llvm/Constants.h"
 #include "llvm/Function.h"
+#include "llvm/ADT/VectorExtras.h"
 using namespace llvm;
 
 PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
@@ -951,3 +952,58 @@ PPCTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
   return BB;
 }
 
+std::vector<unsigned> PPCTargetLowering::
+getRegForInlineAsmConstraint(const std::string &Constraint) const {
+  if (Constraint.size() == 1) {
+    switch (Constraint[0]) {      // GCC RS6000 Constraint Letters
+    default: break;  // Unknown constriant letter
+    case 'b': 
+      return make_vector<unsigned>(/*no R0*/ PPC::R1 , PPC::R2 , PPC::R3 ,
+                                   PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
+                                   PPC::R8 , PPC::R9 , PPC::R10, PPC::R11, 
+                                   PPC::R12, PPC::R13, PPC::R14, PPC::R15, 
+                                   PPC::R16, PPC::R17, PPC::R18, PPC::R19, 
+                                   PPC::R20, PPC::R21, PPC::R22, PPC::R23, 
+                                   PPC::R24, PPC::R25, PPC::R26, PPC::R27, 
+                                   PPC::R28, PPC::R29, PPC::R30, PPC::R31, 
+                                   0);
+    case 'r': 
+      return make_vector<unsigned>(PPC::R0 , PPC::R1 , PPC::R2 , PPC::R3 ,
+                                   PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
+                                   PPC::R8 , PPC::R9 , PPC::R10, PPC::R11, 
+                                   PPC::R12, PPC::R13, PPC::R14, PPC::R15, 
+                                   PPC::R16, PPC::R17, PPC::R18, PPC::R19, 
+                                   PPC::R20, PPC::R21, PPC::R22, PPC::R23, 
+                                   PPC::R24, PPC::R25, PPC::R26, PPC::R27, 
+                                   PPC::R28, PPC::R29, PPC::R30, PPC::R31, 
+                                   0);
+    case 'f': 
+      return make_vector<unsigned>(PPC::F0 , PPC::F1 , PPC::F2 , PPC::F3 ,
+                                   PPC::F4 , PPC::F5 , PPC::F6 , PPC::F7 ,
+                                   PPC::F8 , PPC::F9 , PPC::F10, PPC::F11, 
+                                   PPC::F12, PPC::F13, PPC::F14, PPC::F15, 
+                                   PPC::F16, PPC::F17, PPC::F18, PPC::F19, 
+                                   PPC::F20, PPC::F21, PPC::F22, PPC::F23, 
+                                   PPC::F24, PPC::F25, PPC::F26, PPC::F27, 
+                                   PPC::F28, PPC::F29, PPC::F30, PPC::F31, 
+                                   0);
+    case 'v': 
+      return make_vector<unsigned>(PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 ,
+                                   PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
+                                   PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, 
+                                   PPC::V12, PPC::V13, PPC::V14, PPC::V15, 
+                                   PPC::V16, PPC::V17, PPC::V18, PPC::V19, 
+                                   PPC::V20, PPC::V21, PPC::V22, PPC::V23, 
+                                   PPC::V24, PPC::V25, PPC::V26, PPC::V27, 
+                                   PPC::V28, PPC::V29, PPC::V30, PPC::V31, 
+                                   0);
+    case 'y': 
+      return make_vector<unsigned>(PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3,
+                                   PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7,
+                                   0);
+    }
+  }
+  
+  // Handle explicit register names.
+  return TargetLowering::getRegForInlineAsmConstraint(Constraint);
+}
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index 9f6b77beec6..30db16c8f9a 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -96,6 +96,10 @@ namespace llvm {
 
     virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
                                                        MachineBasicBlock *MBB);
+    
+    std::vector<unsigned> 
+      getRegForInlineAsmConstraint(const std::string &Constraint) const;
+
   };
 }
 
-- 
2.34.1