File backport-llvm-r212711 of Package llvm.7809

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File backport-llvm-r212711 of Package llvm.7809

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r212711 | rsandifo | 2014-07-10 13:44:37 +0200 (Thu, 10 Jul 2014) | 4 lines

[SystemZ] Use SystemZCallingConv.td to define callee-saved registers
    
Just a clean-up.  No behavioral change intended.

------------------------------------------------------------------------
Index: lib/Target/SystemZ/SystemZRegisterInfo.cpp
===================================================================
--- lib/Target/SystemZ/SystemZRegisterInfo.cpp.orig
+++ lib/Target/SystemZ/SystemZRegisterInfo.cpp
@@ -20,18 +20,14 @@ using namespace llvm;
 SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm)
   : SystemZGenRegisterInfo(SystemZ::R14D), TM(tm) {}
 
-const uint16_t*
+const uint16_t *
 SystemZRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
-  static const uint16_t CalleeSavedRegs[] = {
-    SystemZ::R6D,  SystemZ::R7D,  SystemZ::R8D,  SystemZ::R9D,
-    SystemZ::R10D, SystemZ::R11D, SystemZ::R12D, SystemZ::R13D,
-    SystemZ::R14D, SystemZ::R15D,
-    SystemZ::F8D,  SystemZ::F9D,  SystemZ::F10D, SystemZ::F11D,
-    SystemZ::F12D, SystemZ::F13D, SystemZ::F14D, SystemZ::F15D,
-    0
-  };
+  return CSR_SystemZ_SaveList;
+}
 
-  return CalleeSavedRegs;
+const uint32_t *
+SystemZRegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
+  return CSR_SystemZ_RegMask;
 }
 
 BitVector
Index: lib/Target/SystemZ/SystemZInstrInfo.td
===================================================================
--- lib/Target/SystemZ/SystemZInstrInfo.td.orig
+++ lib/Target/SystemZ/SystemZInstrInfo.td
@@ -233,9 +233,7 @@ defm CondStore64 : CondStores<GR64, nonv
 // Call instructions
 //===----------------------------------------------------------------------===//
 
-// The definitions here are for the call-clobbered registers.
-let isCall = 1, Defs = [R0D, R1D, R2D, R3D, R4D, R5D, R14D,
-                        F0D, F1D, F2D, F3D, F4D, F5D, F6D, F7D, CC] in {
+let isCall = 1, Defs = [R14D, CC] in {
   def CallBRASL : Alias<6, (outs), (ins pcrel32:$I2, variable_ops),
                         [(z_call pcrel32:$I2)]>;
   def CallBASR  : Alias<2, (outs), (ins ADDR64:$R2, variable_ops),
Index: lib/Target/SystemZ/SystemZISelLowering.cpp
===================================================================
--- lib/Target/SystemZ/SystemZISelLowering.cpp.orig
+++ lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -913,6 +913,12 @@ SystemZTargetLowering::LowerCall(CallLow
     Ops.push_back(DAG.getRegister(RegsToPass[I].first,
                                   RegsToPass[I].second.getValueType()));
 
+  // Add a register mask operand representing the call-preserved registers.
+  const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
+  const uint32_t *Mask = TRI->getCallPreservedMask(CallConv);
+  assert(Mask && "Missing call preserved mask for calling convention");
+  Ops.push_back(DAG.getRegisterMask(Mask));
+
   // Glue the call to the argument copies, if any.
   if (Glue.getNode())
     Ops.push_back(Glue);
Index: lib/Target/SystemZ/SystemZCallingConv.td
===================================================================
--- lib/Target/SystemZ/SystemZCallingConv.td.orig
+++ lib/Target/SystemZ/SystemZCallingConv.td
@@ -13,7 +13,7 @@ class CCIfExtend<CCAction A>
   : CCIf<"ArgFlags.isSExt() || ArgFlags.isZExt()", A>;
 
 //===----------------------------------------------------------------------===//
-// SVR4 return value calling convention
+// z/Linux return value calling convention
 //===----------------------------------------------------------------------===//
 def RetCC_SystemZ : CallingConv<[
   // Promote i32 to i64 if it has an explicit extension type.
@@ -39,7 +39,7 @@ def RetCC_SystemZ : CallingConv<[
 ]>;
 
 //===----------------------------------------------------------------------===//
-// SVR4 argument calling conventions
+// z/Linux argument calling conventions
 //===----------------------------------------------------------------------===//
 def CC_SystemZ : CallingConv<[
   // Promote i32 to i64 if it has an explicit extension type.
@@ -63,3 +63,9 @@ def CC_SystemZ : CallingConv<[
   // Other arguments are passed in 8-byte-aligned 8-byte stack slots.
   CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>
 ]>;
+
+//===----------------------------------------------------------------------===//
+// z/Linux callee-saved registers
+//===----------------------------------------------------------------------===//
+def CSR_SystemZ : CalleeSavedRegs<(add (sequence "R%dD", 6, 15),
+                                       (sequence "F%dD", 8, 15))>;
Index: lib/Target/SystemZ/SystemZRegisterInfo.h
===================================================================
--- lib/Target/SystemZ/SystemZRegisterInfo.h.orig
+++ lib/Target/SystemZ/SystemZRegisterInfo.h
@@ -54,6 +54,8 @@ public:
   }
   virtual const uint16_t *getCalleeSavedRegs(const MachineFunction *MF = 0)
     const LLVM_OVERRIDE;
+  virtual const uint32_t *getCallPreservedMask(CallingConv::ID CC)
+    const LLVM_OVERRIDE;
   virtual BitVector getReservedRegs(const MachineFunction &MF)
     const LLVM_OVERRIDE;
   virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI,

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