247 lines
11 KiB
TableGen
247 lines
11 KiB
TableGen
//===-- ARMCallingConv.td - Calling Conventions for ARM ----*- 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 ARM architecture.
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//===----------------------------------------------------------------------===//
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/// CCIfAlign - Match of the original alignment of the arg
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class CCIfAlign<string Align, CCAction A>:
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CCIf<!strconcat("ArgFlags.getOrigAlign() == ", Align), A>;
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//===----------------------------------------------------------------------===//
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// ARM APCS Calling Convention
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//===----------------------------------------------------------------------===//
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def CC_ARM_APCS : CallingConv<[
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// Handles byval parameters.
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CCIfByVal<CCPassByVal<4, 4>>,
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CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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// f64 and v2f64 are passed in adjacent GPRs, possibly split onto the stack
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CCIfType<[f64, v2f64], CCCustom<"CC_ARM_APCS_Custom_f64">>,
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CCIfType<[f32], CCBitConvertToType<i32>>,
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CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
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CCIfType<[i32], CCAssignToStack<4, 4>>,
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CCIfType<[f64], CCAssignToStack<8, 4>>,
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CCIfType<[v2f64], CCAssignToStack<16, 4>>
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]>;
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def RetCC_ARM_APCS : CallingConv<[
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CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
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CCIfType<[f32], CCBitConvertToType<i32>>,
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[f64, v2f64], CCCustom<"RetCC_ARM_APCS_Custom_f64">>,
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CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
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CCIfType<[i64], CCAssignToRegWithShadow<[R0, R2], [R1, R3]>>
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]>;
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//===----------------------------------------------------------------------===//
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// ARM APCS Calling Convention for FastCC (when VFP2 or later is available)
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//===----------------------------------------------------------------------===//
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def FastCC_ARM_APCS : CallingConv<[
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[v2f64], CCAssignToReg<[Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6, D7]>>,
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CCIfType<[f32], CCAssignToReg<[S0, S1, S2, S3, S4, S5, S6, S7, S8,
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S9, S10, S11, S12, S13, S14, S15]>>,
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// CPRCs may be allocated to co-processor registers or the stack - they
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// may never be allocated to core registers.
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CCIfType<[f32], CCAssignToStackWithShadow<4, 4, [Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToStackWithShadow<8, 4, [Q0, Q1, Q2, Q3]>>,
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CCIfType<[v2f64], CCAssignToStackWithShadow<16, 4, [Q0, Q1, Q2, Q3]>>,
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CCDelegateTo<CC_ARM_APCS>
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]>;
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def RetFastCC_ARM_APCS : CallingConv<[
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[v2f64], CCAssignToReg<[Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6, D7]>>,
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CCIfType<[f32], CCAssignToReg<[S0, S1, S2, S3, S4, S5, S6, S7, S8,
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S9, S10, S11, S12, S13, S14, S15]>>,
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CCDelegateTo<RetCC_ARM_APCS>
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]>;
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//===----------------------------------------------------------------------===//
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// ARM APCS Calling Convention for GHC
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//===----------------------------------------------------------------------===//
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def CC_ARM_APCS_GHC : CallingConv<[
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[v2f64], CCAssignToReg<[Q4, Q5]>>,
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CCIfType<[f64], CCAssignToReg<[D8, D9, D10, D11]>>,
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CCIfType<[f32], CCAssignToReg<[S16, S17, S18, S19, S20, S21, S22, S23]>>,
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// Promote i8/i16 arguments to i32.
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CCIfType<[i8, i16], CCPromoteToType<i32>>,
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// Pass in STG registers: Base, Sp, Hp, R1, R2, R3, R4, SpLim
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CCIfType<[i32], CCAssignToReg<[R4, R5, R6, R7, R8, R9, R10, R11]>>
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]>;
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//===----------------------------------------------------------------------===//
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// ARM AAPCS (EABI) Calling Convention, common parts
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//===----------------------------------------------------------------------===//
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def CC_ARM_AAPCS_Common : CallingConv<[
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CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
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// i64/f64 is passed in even pairs of GPRs
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// i64 is 8-aligned i32 here, so we may need to eat R1 as a pad register
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// (and the same is true for f64 if VFP is not enabled)
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CCIfType<[i32], CCIfAlign<"8", CCAssignToRegWithShadow<[R0, R2], [R0, R1]>>>,
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CCIfType<[i32], CCIf<"ArgFlags.getOrigAlign() != 8",
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CCAssignToReg<[R0, R1, R2, R3]>>>,
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CCIfType<[i32], CCIfAlign<"8", CCAssignToStackWithShadow<4, 8, [R0, R1, R2, R3]>>>,
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CCIfType<[i32], CCAssignToStackWithShadow<4, 4, [R0, R1, R2, R3]>>,
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CCIfType<[f32], CCAssignToStackWithShadow<4, 4, [Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToStackWithShadow<8, 8, [Q0, Q1, Q2, Q3]>>,
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CCIfType<[v2f64], CCIfAlign<"16",
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CCAssignToStackWithShadow<16, 16, [Q0, Q1, Q2, Q3]>>>,
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CCIfType<[v2f64], CCAssignToStackWithShadow<16, 8, [Q0, Q1, Q2, Q3]>>
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]>;
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def RetCC_ARM_AAPCS_Common : CallingConv<[
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CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
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CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
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CCIfType<[i64], CCAssignToRegWithShadow<[R0, R2], [R1, R3]>>
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]>;
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//===----------------------------------------------------------------------===//
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// ARM AAPCS (EABI) Calling Convention
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//===----------------------------------------------------------------------===//
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def CC_ARM_AAPCS : CallingConv<[
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// Handles byval parameters.
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CCIfByVal<CCPassByVal<4, 4>>,
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// The 'nest' parameter, if any, is passed in R12.
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CCIfNest<CCAssignToReg<[R12]>>,
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[f64, v2f64], CCCustom<"CC_ARM_AAPCS_Custom_f64">>,
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CCIfType<[f32], CCBitConvertToType<i32>>,
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CCDelegateTo<CC_ARM_AAPCS_Common>
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]>;
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def RetCC_ARM_AAPCS : CallingConv<[
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[f64, v2f64], CCCustom<"RetCC_ARM_AAPCS_Custom_f64">>,
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CCIfType<[f32], CCBitConvertToType<i32>>,
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CCDelegateTo<RetCC_ARM_AAPCS_Common>
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]>;
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//===----------------------------------------------------------------------===//
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// ARM AAPCS-VFP (EABI) Calling Convention
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// Also used for FastCC (when VFP2 or later is available)
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//===----------------------------------------------------------------------===//
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def CC_ARM_AAPCS_VFP : CallingConv<[
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// Handles byval parameters.
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CCIfByVal<CCPassByVal<4, 4>>,
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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// HFAs are passed in a contiguous block of registers, or on the stack
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CCIfConsecutiveRegs<CCCustom<"CC_ARM_AAPCS_Custom_Aggregate">>,
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CCIfType<[v2f64], CCAssignToReg<[Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6, D7]>>,
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CCIfType<[f32], CCAssignToReg<[S0, S1, S2, S3, S4, S5, S6, S7, S8,
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S9, S10, S11, S12, S13, S14, S15]>>,
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CCDelegateTo<CC_ARM_AAPCS_Common>
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]>;
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def RetCC_ARM_AAPCS_VFP : CallingConv<[
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// Handle all vector types as either f64 or v2f64.
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CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
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CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32], CCBitConvertToType<v2f64>>,
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CCIfType<[v2f64], CCAssignToReg<[Q0, Q1, Q2, Q3]>>,
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CCIfType<[f64], CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6, D7]>>,
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CCIfType<[f32], CCAssignToReg<[S0, S1, S2, S3, S4, S5, S6, S7, S8,
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S9, S10, S11, S12, S13, S14, S15]>>,
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CCDelegateTo<RetCC_ARM_AAPCS_Common>
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]>;
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//===----------------------------------------------------------------------===//
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// Callee-saved register lists.
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//===----------------------------------------------------------------------===//
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def CSR_NoRegs : CalleeSavedRegs<(add)>;
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def CSR_AAPCS : CalleeSavedRegs<(add LR, R11, R10, R9, R8, R7, R6, R5, R4,
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(sequence "D%u", 15, 8))>;
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// Constructors and destructors return 'this' in the ARM C++ ABI; since 'this'
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// and the pointer return value are both passed in R0 in these cases, this can
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// be partially modelled by treating R0 as a callee-saved register
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// Only the resulting RegMask is used; the SaveList is ignored
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def CSR_AAPCS_ThisReturn : CalleeSavedRegs<(add LR, R11, R10, R9, R8, R7, R6,
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R5, R4, (sequence "D%u", 15, 8),
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R0)>;
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// iOS ABI deviates from ARM standard ABI. R9 is not a callee-saved register.
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// Also save R7-R4 first to match the stack frame fixed spill areas.
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def CSR_iOS : CalleeSavedRegs<(add LR, R7, R6, R5, R4, (sub CSR_AAPCS, R9))>;
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def CSR_iOS_ThisReturn : CalleeSavedRegs<(add LR, R7, R6, R5, R4,
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(sub CSR_AAPCS_ThisReturn, R9))>;
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// The "interrupt" attribute is used to generate code that is acceptable in
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// exception-handlers of various kinds. It makes us use a different return
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// instruction (handled elsewhere) and affects which registers we must return to
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// our "caller" in the same state as we receive them.
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// For most interrupts, all registers except SP and LR are shared with
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// user-space. We mark LR to be saved anyway, since this is what the ARM backend
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// generally does rather than tracking its liveness as a normal register.
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def CSR_GenericInt : CalleeSavedRegs<(add LR, (sequence "R%u", 12, 0))>;
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// The fast interrupt handlers have more private state and get their own copies
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// of R8-R12, in addition to SP and LR. As before, mark LR for saving too.
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// FIXME: we mark R11 as callee-saved since it's often the frame-pointer, and
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// current frame lowering expects to encounter it while processing callee-saved
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// registers.
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def CSR_FIQ : CalleeSavedRegs<(add LR, R11, (sequence "R%u", 7, 0))>;
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