From 1c24ba9fad4e668ad854f1ff544e60c347c6d341 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Wed, 29 Jun 2011 19:30:29 +0000
Subject: [PATCH] Move the Blackfin port away from
 getRegClassForInlineAsmConstraint by creating a few specific register
 classes.

Part of rdar://9643582


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134086 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Blackfin/BlackfinISelLowering.cpp | 34 +++++---------------
 lib/Target/Blackfin/BlackfinISelLowering.h   |  3 --
 lib/Target/Blackfin/BlackfinRegisterInfo.td  | 14 ++++++++
 3 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/lib/Target/Blackfin/BlackfinISelLowering.cpp b/lib/Target/Blackfin/BlackfinISelLowering.cpp
index 588d9bded87..d5728324de8 100644
--- a/lib/Target/Blackfin/BlackfinISelLowering.cpp
+++ b/lib/Target/Blackfin/BlackfinISelLowering.cpp
@@ -621,39 +621,21 @@ getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const {
   case 'w': return Pair(0U, ALLRegisterClass);
   case 'Z': return Pair(P3, PRegisterClass);
   case 'Y': return Pair(P1, PRegisterClass);
+  case 'z': return Pair(0U, zConsRegisterClass);
+  case 'D': return Pair(0U, DConsRegisterClass);
+  case 'W': return Pair(0U, WConsRegisterClass);
+  case 'c': return Pair(0U, cConsRegisterClass);
+  case 't': return Pair(0U, tConsRegisterClass);
+  case 'u': return Pair(0U, uConsRegisterClass);
+  case 'k': return Pair(0U, kConsRegisterClass);
+  case 'y': return Pair(0U, yConsRegisterClass);
   }
 
   // Not implemented: q0-q7, qA. Use {R2} etc instead.
-  // Constraints z, D, W, c, t, u, k, and y use non-existing classes, defer to
-  // getRegClassForInlineAsmConstraint()
 
   return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
 }
 
-std::vector<unsigned> BlackfinTargetLowering::
-getRegClassForInlineAsmConstraint(const std::string &Constraint, EVT VT) const {
-  using namespace BF;
-
-  if (Constraint.size() != 1)
-    return std::vector<unsigned>();
-
-  switch (Constraint[0]) {
-  case 'z': return make_vector<unsigned>(P0, P1, P2, 0);
-  case 'D': return make_vector<unsigned>(R0, R2, R4, R6, 0);
-  case 'W': return make_vector<unsigned>(R1, R3, R5, R7, 0);
-  case 'c': return make_vector<unsigned>(I0, I1, I2, I3,
-                                         B0, B1, B2, B3,
-                                         L0, L1, L2, L3, 0);
-  case 't': return make_vector<unsigned>(LT0, LT1, 0);
-  case 'u': return make_vector<unsigned>(LB0, LB1, 0);
-  case 'k': return make_vector<unsigned>(LC0, LC1, 0);
-  case 'y': return make_vector<unsigned>(RETS, RETN, RETI, RETX, RETE,
-                                         ASTAT, SEQSTAT, USP, 0);
-  }
-
-  return std::vector<unsigned>();
-}
-
 bool BlackfinTargetLowering::
 isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
   // The Blackfin target isn't yet aware of offsets.
diff --git a/lib/Target/Blackfin/BlackfinISelLowering.h b/lib/Target/Blackfin/BlackfinISelLowering.h
index 9a54557ad52..b65775b9285 100644
--- a/lib/Target/Blackfin/BlackfinISelLowering.h
+++ b/lib/Target/Blackfin/BlackfinISelLowering.h
@@ -48,9 +48,6 @@ namespace llvm {
 
     std::pair<unsigned, const TargetRegisterClass*>
     getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
-    std::vector<unsigned>
-    getRegClassForInlineAsmConstraint(const std::string &Constraint,
-                                      EVT VT) const;
     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
     const char *getTargetNodeName(unsigned Opcode) const;
 
diff --git a/lib/Target/Blackfin/BlackfinRegisterInfo.td b/lib/Target/Blackfin/BlackfinRegisterInfo.td
index 0d502fdcc7e..1c42205eb78 100644
--- a/lib/Target/Blackfin/BlackfinRegisterInfo.td
+++ b/lib/Target/Blackfin/BlackfinRegisterInfo.td
@@ -261,3 +261,17 @@ def StatBit : RegisterClass<"BF", [i1], 8,
 
 // Should be i40, but that isn't defined. It is not a legal type yet anyway.
 def Accu : RegisterClass<"BF", [i64], 64, (add A0, A1)>;
+
+// Register classes to match inline asm constraints.
+def zCons : RegisterClass<"BF", [i32], 32, (add P0, P1, P2)>;
+def DCons : RegisterClass<"BF", [i32], 32, (add R0, R2, R4, R6)>;
+def WCons : RegisterClass<"BF", [i32], 32, (add R1, R3, R5, R7)>;
+def cCons : RegisterClass<"BF", [i32], 32, (add I0, I1, I2, I3,
+    	    			       	   	B0, B1, B2, B3,
+						L0, L1, L2, L3)>;
+def tCons : RegisterClass<"BF", [i32], 32, (add LT0, LT1)>;
+def uCons : RegisterClass<"BF", [i32], 32, (add LB0, LB1)>;
+def kCons : RegisterClass<"BF", [i32], 32, (add LC0, LC1)>;
+def yCons : RegisterClass<"BF", [i32], 32, (add RETS, RETN, RETI, RETX,
+    	    			       	   	RETE, ASTAT, SEQSTAT,
+						USP)>;