[AVR] Added AVRCallingConv.td

llvm-svn: 256130

llvm/lib/Target/AVR/AVR.td

@@ -522,7 +522,7 @@ include "AVRRegisterInfo.td"
 // Calling Conventions
 //===---------------------------------------------------------------------===//
 
-//include "AVRCallingConv.td"
+include "AVRCallingConv.td"
 
 //===---------------------------------------------------------------------===//
 // Assembly Printers

llvm/lib/Target/AVR/AVRCallingConv.td

@@ -0,0 +1,65 @@
+//===-- AVRCallingConv.td - Calling Conventions for AVR ----*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// This describes the calling conventions for AVR architecture.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// AVR Return Value Calling Convention
+//===----------------------------------------------------------------------===//
+
+def RetCC_AVR : CallingConv
+<[
+  // i8 is returned in R24.
+  CCIfType<[i8], CCAssignToReg<[R24]>>,
+
+  // i16 are returned in R25:R24, R23:R22, R21:R20 and R19:R18.
+  CCIfType<[i16], CCAssignToReg<[R25R24, R23R22, R21R20, R19R18]>>
+]>;
+
+// Special return value calling convention for runtime functions.
+def RetCC_AVR_RT : CallingConv
+<[
+  CCIfType<[i8], CCAssignToReg<[R24,R25]>>,
+  CCIfType<[i16], CCAssignToReg<[R23R22, R25R24]>>
+]>;
+
+//===----------------------------------------------------------------------===//
+// AVR Argument Calling Conventions
+//===----------------------------------------------------------------------===//
+
+// The calling conventions are implemented in custom C++ code
+
+// Calling convention for variadic functions.
+def ArgCC_AVR_Vararg : CallingConv
+<[
+  // i16 are always passed through the stack with an alignment of 1.
+  CCAssignToStack<2, 1>
+]>;
+
+// Special argument calling convention for
+// multiplication runtime functions.
+def ArgCC_AVR_RT_MUL : CallingConv
+<[
+  CCIfType<[i16], CCAssignToReg<[R27R26,R19R18]>>
+]>;
+
+// Special argument calling convention for
+// division runtime functions.
+def ArgCC_AVR_RT_DIV : CallingConv
+<[
+  CCIfType<[i8], CCAssignToReg<[R24,R22]>>,
+  CCIfType<[i16], CCAssignToReg<[R25R24, R23R22]>>
+]>;
+
+//===----------------------------------------------------------------------===//
+// Callee-saved register lists.
+//===----------------------------------------------------------------------===//
+
+def CSR_Normal : CalleeSavedRegs<(add R29, R28, (sequence "R%u", 17, 2))>;
+def CSR_Interrupts : CalleeSavedRegs<(add (sequence "R%u", 31, 0))>;

llvm/lib/Target/AVR/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(LLVM_TARGET_DEFINITIONS AVR.td)
 
 tablegen(LLVM AVRGenRegisterInfo.inc -gen-register-info)
+tablegen(LLVM AVRGenCallingConv.inc -gen-callingconv)
 add_public_tablegen_target(AVRCommonTableGen)
 
 add_llvm_target(AVRCodeGen