Switch Alpha over to the new call lowering style. New code mostly
copied from the SystemZ target. I don't think this causes any
significant changes to the output (I compared the assembly, and the
results appeared to be essentially unchanged), although I don't actually
have an Alpha to test on.
I would appreciate if anyone with the appropriate hardware could test
this. I'm not sure if that includes anyone subscribed to llvm-commits,
though.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76353 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaCallingConv.td b/lib/Target/Alpha/AlphaCallingConv.td
new file mode 100644
index 0000000..38ada69
--- /dev/null
+++ b/lib/Target/Alpha/AlphaCallingConv.td
@@ -0,0 +1,37 @@
+//===- AlphaCallingConv.td - Calling Conventions for Alpha -*- 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 Alpha architecture.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Alpha Return Value Calling Convention
+//===----------------------------------------------------------------------===//
+def RetCC_Alpha : CallingConv<[
+ // i64 is returned in register R0
+ CCIfType<[i64], CCAssignToReg<[R0]>>,
+
+ // f32 / f64 are returned in F0/F1
+ CCIfType<[f32, f64], CCAssignToReg<[F0, F1]>>
+]>;
+
+//===----------------------------------------------------------------------===//
+// Alpha Argument Calling Conventions
+//===----------------------------------------------------------------------===//
+def CC_Alpha : CallingConv<[
+ // The first 6 arguments are passed in registers, whether integer or
+ // floating-point
+ CCIfType<[i64], CCAssignToRegWithShadow<[R16, R17, R18, R19, R20, R21],
+ [F16, F17, F18, F19, F20, F21]>>,
+
+ CCIfType<[f32, f64], CCAssignToRegWithShadow<[F16, F17, F18, F19, F20, F21],
+ [R16, R17, R18, R19, R20, R21]>>,
+
+ // Stack slots are 8 bytes in size and 8-byte aligned.
+ CCIfType<[i64, f32, f64], CCAssignToStack<8, 8>>
+]>;