forked from OSchip/llvm-project
47 lines
1.9 KiB
TableGen
47 lines
1.9 KiB
TableGen
//=- SystemZCallingConv.td - Calling Conventions for SystemZ -*- tablegen -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This describes the calling conventions for SystemZ architecture.
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// SystemZ Return Value Calling Convention
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//===----------------------------------------------------------------------===//
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def RetCC_SystemZ : CallingConv<[
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// Promote i8/i16/i32 arguments to i64.
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CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
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// i64 is returned in register R2
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CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D]>>,
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// f32 / f64 are returned in F0
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CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
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CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>
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]>;
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//===----------------------------------------------------------------------===//
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// SystemZ Argument Calling Conventions
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//===----------------------------------------------------------------------===//
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def CC_SystemZ : CallingConv<[
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// Promote i8/i16/i32 arguments to i64.
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CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
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// The first 5 integer arguments of non-varargs functions are passed in
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// integer registers.
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CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>,
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// The first 4 floating point arguments of non-varargs functions are passed
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// in FP registers.
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CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
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CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>,
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// Integer values get stored in stack slots that are 8 bytes in
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// size and 8-byte aligned.
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CCIfType<[i64, f32, f64], CCAssignToStack<8, 8>>
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]>;
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