Add support for the ARM GHC calling convention, this patch was in 3.0,

but somehow managed to be dropped later.

Patch by Karel Gardas.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161226 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMBaseRegisterInfo.cpp

@@ -62,8 +62,20 @@ ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
 
 const uint16_t*
 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
+  bool ghcCall = false;
+ 
+  if (MF) {
+    const Function *F = MF->getFunction();
+    ghcCall = (F ? F->getCallingConv() == CallingConv::GHC : false);
+  }
+ 
+  if (ghcCall) {
+      return CSR_GHC_SaveList;
+  }
+  else {
   return (STI.isTargetIOS() && !STI.isAAPCS_ABI())
     ? CSR_iOS_SaveList : CSR_AAPCS_SaveList;
+  }
 }
 
 const uint32_t*

lib/Target/ARM/ARMCallingConv.td

@@ -79,6 +79,25 @@ def RetFastCC_ARM_APCS : CallingConv<[
   CCDelegateTo<RetCC_ARM_APCS>
 ]>;
 
+//===----------------------------------------------------------------------===//
+// ARM APCS Calling Convention for GHC
+//===----------------------------------------------------------------------===//
+
+def CC_ARM_APCS_GHC : CallingConv<[
+  // Handle all vector types as either f64 or v2f64.
+  CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
+  CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
+
+  CCIfType<[v2f64], CCAssignToReg<[Q4, Q5]>>,
+  CCIfType<[f64], CCAssignToReg<[D8, D9, D10, D11]>>,
+  CCIfType<[f32], CCAssignToReg<[S16, S17, S18, S19, S20, S21, S22, S23]>>,
+
+  // Promote i8/i16 arguments to i32.
+  CCIfType<[i8, i16], CCPromoteToType<i32>>,
+
+  // Pass in STG registers: Base, Sp, Hp, R1, R2, R3, R4, SpLim
+  CCIfType<[i32], CCAssignToReg<[R4, R5, R6, R7, R8, R9, R10, R11]>>
+]>;
 
 //===----------------------------------------------------------------------===//
 // ARM AAPCS (EABI) Calling Convention, common parts
@@ -171,3 +190,9 @@ def CSR_AAPCS : CalleeSavedRegs<(add LR, R11, R10, R9, R8, R7, R6, R5, R4,
 // iOS ABI deviates from ARM standard ABI. R9 is not a callee-saved register.
 // Also save R7-R4 first to match the stack frame fixed spill areas.
 def CSR_iOS : CalleeSavedRegs<(add LR, R7, R6, R5, R4, (sub CSR_AAPCS, R9))>;
+
+// GHC set of callee saved regs is empty as all those regs are
+// used for passing STG regs around
+// add is a workaround for not being able to compile empty list:
+// def CSR_GHC : CalleeSavedRegs<()>;
+def CSR_GHC : CalleeSavedRegs<(add)>;

lib/Target/ARM/ARMFastISel.cpp

@@ -1842,6 +1842,11 @@ CCAssignFn *ARMFastISel::CCAssignFnForCall(CallingConv::ID CC,
     return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
   case CallingConv::ARM_APCS:
     return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
+  case CallingConv::GHC:
+    if (Return)
+      llvm_unreachable("Can't return in GHC call convention");
+    else
+      return CC_ARM_APCS_GHC;
   }
 }
 

lib/Target/ARM/ARMFrameLowering.cpp

@@ -15,6 +15,8 @@
 #include "ARMBaseInstrInfo.h"
 #include "ARMBaseRegisterInfo.h"
 #include "ARMMachineFunctionInfo.h"
+#include "llvm/CallingConv.h"
+#include "llvm/Function.h"
 #include "MCTargetDesc/ARMAddressingModes.h"
 #include "llvm/Function.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
@@ -151,6 +153,10 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
   int FramePtrSpillFI = 0;
   int D8SpillFI = 0;
 
+  // All calls are tail calls in GHC calling conv, and functions have no prologue/epilogue.
+  if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
+    return;
+
   // Allocate the vararg register save area. This is not counted in NumBytes.
   if (VARegSaveSize)
     emitSPUpdate(isARM, MBB, MBBI, dl, TII, -VARegSaveSize,
@@ -354,6 +360,10 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
   int NumBytes = (int)MFI->getStackSize();
   unsigned FramePtr = RegInfo->getFrameRegister(MF);
 
+  // All calls are tail calls in GHC calling conv, and functions have no prologue/epilogue.
+  if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
+    return;
+
   if (!AFI->hasStackFrame()) {
     if (NumBytes != 0)
       emitSPUpdate(isARM, MBB, MBBI, dl, TII, NumBytes);

lib/Target/ARM/ARMISelLowering.cpp

@@ -1171,6 +1171,8 @@ CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC,
     return (Return ? RetCC_ARM_AAPCS : CC_ARM_AAPCS);
   case CallingConv::ARM_APCS:
     return (Return ? RetCC_ARM_APCS : CC_ARM_APCS);
+  case CallingConv::GHC:
+    return (Return ? RetCC_ARM_APCS : CC_ARM_APCS_GHC);
   }
 }