forked from OSchip/llvm-project
35 lines
1.4 KiB
TableGen
35 lines
1.4 KiB
TableGen
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//===- Nios2CallingConv.td - Calling Conventions for Nios2 -*- 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 Nios2 architecture.
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//===----------------------------------------------------------------------===//
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/// CCIfSubtarget - Match if the current subtarget has a feature F.
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class CCIfSubtarget<string F, CCAction A>:
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CCIf<!strconcat("State.getTarget().getSubtarget<Nios2Subtarget>().", F), A>;
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def CC_Nios2 : CallingConv<[
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// i32 f32 arguments get passed in integer registers if there is space.
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CCIfType<[i32, f32], CCAssignToReg<[R4, R5, R6, R7]>>,
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// Alternatively, they are assigned to the stack in 4-byte aligned units.
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CCAssignToStack<4, 4>
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]>;
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def RetCC_Nios2EABI : CallingConv<[
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// i32 are returned in registers R2, R3
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CCIfType<[i32], CCAssignToReg<[R2, R3]>>,
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// In case of floating point (FPH2 instr.) also use the same register set
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CCIfType<[f32], CCAssignToReg<[R2, R3]>>,
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CCIfByVal<CCPassByVal<4, 4>>,
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// Stack parameter slots for i32 is 32-bit words and 4-byte aligned.
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CCIfType<[i32], CCAssignToStack<4, 4>>
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]>;
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def CSR : CalleeSavedRegs<(add RA, FP, (sequence "R%u", 16, 23))>;
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