Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/Target/Lanai/LanaiCallingConv.td

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+//===- LanaiCallingConv.td - Calling Conventions Lanai -------*- 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 the Lanai architectures.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Return Value Calling Conventions
+//===----------------------------------------------------------------------===//
+
+// Lanai 32-bit C Calling convention.
+def CC_Lanai32 : CallingConv<[
+  // Promote i8/i16 args to i32
+  CCIfType<[i8, i16], CCPromoteToType<i32>>,
+
+  // Put argument in registers if marked 'inreg' and not a vararg call.
+  CCIfNotVarArg<CCIfInReg<CCIfType<[i32],
+                                   CCAssignToReg<[R6, R7, R18, R19]>>>>,
+
+  // Otherwise they are assigned to the stack in 4-byte aligned units.
+  CCAssignToStack<4, 4>
+]>;
+
+// Lanai 32-bit Fast Calling convention.
+def CC_Lanai32_Fast : CallingConv<[
+  // Promote i8/i16 args to i32
+  CCIfType<[ i8, i16 ], CCPromoteToType<i32>>,
+
+  // Put arguments in registers.
+  CCIfNotVarArg<CCIfType<[i32], CCAssignToReg<[ R6, R7, R18, R19 ]>>>,
+
+  // Otherwise they are assigned to the stack in 4-byte aligned units.
+  CCAssignToStack<4, 4>
+]>;
+
+// Lanai 32-bit C return-value convention.
+def RetCC_Lanai32 : CallingConv<[
+  // Specify two registers to allow returning 64-bit results that have already
+  // been lowered to 2 32-bit values.
+  CCIfType<[i32], CCAssignToReg<[RV, R9]>>
+]>;
+
+def CSR: CalleeSavedRegs<(add)>;