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190 lines
7.0 KiB
C++
190 lines
7.0 KiB
C++
//===- X86CallingConv.td - Calling Conventions for X86 32/64 ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This describes the calling conventions for the X86-32 and X86-64
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// architectures.
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//
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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<X86Subtarget>().", F), A>;
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//===----------------------------------------------------------------------===//
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// Return Value Calling Conventions
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//===----------------------------------------------------------------------===//
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// Return-value conventions common to all X86 CC's.
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def RetCC_X86Common : CallingConv<[
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// Scalar values are returned in AX first, then DX.
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CCIfType<[i8] , CCAssignToReg<[AL]>>,
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CCIfType<[i16], CCAssignToReg<[AX]>>,
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CCIfType<[i32], CCAssignToReg<[EAX, EDX]>>,
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CCIfType<[i64], CCAssignToReg<[RAX, RDX]>>,
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// Vector types are returned in XMM0 and XMM1, when they fit. If the target
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// doesn't have XMM registers, it won't have vector types.
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CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
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CCAssignToReg<[XMM0,XMM1]>>,
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// MMX vector types are always returned in MM0. If the target doesn't have
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// MM0, it doesn't support these vector types.
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CCIfType<[v8i8, v4i16, v2i32, v1i64], CCAssignToReg<[MM0]>>,
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// Long double types are always returned in ST0 (even with SSE).
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CCIfType<[f80], CCAssignToReg<[ST0]>>
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]>;
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// X86-32 C return-value convention.
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def RetCC_X86_32_C : CallingConv<[
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// The X86-32 calling convention returns FP values in ST0, otherwise it is the
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// same as the common X86 calling conv.
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CCIfType<[f32], CCAssignToReg<[ST0]>>,
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CCIfType<[f64], CCAssignToReg<[ST0]>>,
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CCDelegateTo<RetCC_X86Common>
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]>;
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// X86-32 FastCC return-value convention.
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def RetCC_X86_32_Fast : CallingConv<[
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// The X86-32 fastcc returns FP values in XMM0 if the target has SSE2,
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// otherwise it is the the C calling conventions.
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CCIfType<[f32], CCIfSubtarget<"hasSSE2()", CCAssignToReg<[XMM0]>>>,
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CCIfType<[f64], CCIfSubtarget<"hasSSE2()", CCAssignToReg<[XMM0]>>>,
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CCDelegateTo<RetCC_X86Common>
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]>;
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// X86-64 C return-value convention.
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def RetCC_X86_64_C : CallingConv<[
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// The X86-64 calling convention always returns FP values in XMM0.
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CCIfType<[f32], CCAssignToReg<[XMM0]>>,
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CCIfType<[f64], CCAssignToReg<[XMM0]>>,
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CCDelegateTo<RetCC_X86Common>
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]>;
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// This is the root return-value convention for the X86-32 backend.
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def RetCC_X86_32 : CallingConv<[
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// If FastCC, use RetCC_X86_32_Fast.
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CCIfCC<"CallingConv::Fast", CCDelegateTo<RetCC_X86_32_Fast>>,
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// Otherwise, use RetCC_X86_32_C.
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CCDelegateTo<RetCC_X86_32_C>
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]>;
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// This is the root return-value convention for the X86-64 backend.
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def RetCC_X86_64 : CallingConv<[
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// Always just the same as C calling conv for X86-64.
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CCDelegateTo<RetCC_X86_64_C>
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]>;
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// This is the return-value convention used for the entire X86 backend.
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def RetCC_X86 : CallingConv<[
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CCIfSubtarget<"is64Bit()", CCDelegateTo<RetCC_X86_64>>,
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CCDelegateTo<RetCC_X86_32>
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]>;
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//===----------------------------------------------------------------------===//
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// X86-64 Argument Calling Conventions
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//===----------------------------------------------------------------------===//
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def CC_X86_64_C : CallingConv<[
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// Promote i8/i16 arguments to i32.
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CCIfType<[i8, i16], CCPromoteToType<i32>>,
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CCIfStruct<CCStructAssign<[RDI, RSI, RDX, RCX, R8, R9 ]>>,
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// The first 6 integer arguments are passed in integer registers.
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CCIfType<[i32], CCAssignToReg<[EDI, ESI, EDX, ECX, R8D, R9D]>>,
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CCIfType<[i64], CCAssignToReg<[RDI, RSI, RDX, RCX, R8 , R9 ]>>,
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// The first 8 FP/Vector arguments are passed in XMM registers.
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CCIfType<[f32, f64, v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
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CCAssignToReg<[XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7]>>,
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// The first 8 MMX vector arguments are passed in GPRs.
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CCIfType<[v8i8, v4i16, v2i32, v1i64],
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CCAssignToReg<[RDI, RSI, RDX, RCX, R8 , R9 ]>>,
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// The 'nest' parameter, if any, is passed in R10.
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CCIfNest<CCAssignToReg<[R10]>>,
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// Integer/FP values get stored in stack slots that are 8 bytes in size and
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// 8-byte aligned if there are no more registers to hold them.
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CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>,
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// Long doubles get 16-byte stack slots that are 16-byte aligned.
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// Vectors get 16-byte stack slots that are 16-byte aligned.
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CCIfType<[f80, v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
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CCAssignToStack<16, 16>>,
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// __m64 vectors get 8-byte stack slots that are 8-byte aligned.
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CCIfType<[v8i8, v4i16, v2i32, v1i64], CCAssignToStack<8, 8>>
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]>;
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//===----------------------------------------------------------------------===//
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// X86 C Calling Convention
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//===----------------------------------------------------------------------===//
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/// CC_X86_32_Common - In all X86-32 calling conventions, extra integers and FP
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/// values are spilled on the stack, and the first 4 vector values go in XMM
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/// regs.
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def CC_X86_32_Common : CallingConv<[
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// Integer/Float values get stored in stack slots that are 4 bytes in
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// size and 4-byte aligned.
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CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
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// Doubles get 8-byte slots that are 4-byte aligned.
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CCIfType<[f64], CCAssignToStack<8, 4>>,
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// Long doubles get 16-byte slots that are 4-byte aligned.
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CCIfType<[f80], CCAssignToStack<16, 4>>,
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// The first 4 vector arguments are passed in XMM registers.
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CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
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CCAssignToReg<[XMM0, XMM1, XMM2, XMM3]>>,
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// Other vectors get 16-byte stack slots that are 16-byte aligned.
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CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCAssignToStack<16, 16>>,
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// __m64 vectors get 8-byte stack slots that are 8-byte aligned. They are
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// passed in the parameter area.
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CCIfType<[v8i8, v4i16, v2i32, v1i64], CCAssignToStack<8, 8>>
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]>;
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def CC_X86_32_C : CallingConv<[
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// Promote i8/i16 arguments to i32.
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CCIfType<[i8, i16], CCPromoteToType<i32>>,
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// The 'nest' parameter, if any, is passed in ECX.
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CCIfNest<CCAssignToReg<[ECX]>>,
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// The first 3 integer arguments, if marked 'inreg' and if the call is not
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// a vararg call, are passed in integer registers.
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CCIfNotVarArg<CCIfInReg<CCIfType<[i32], CCAssignToReg<[EAX, EDX, ECX]>>>>,
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// Otherwise, same as everything else.
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CCDelegateTo<CC_X86_32_Common>
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]>;
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def CC_X86_32_FastCall : CallingConv<[
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// Promote i8/i16 arguments to i32.
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CCIfType<[i8, i16], CCPromoteToType<i32>>,
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// The 'nest' parameter, if any, is passed in EAX.
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CCIfNest<CCAssignToReg<[EAX]>>,
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// The first 2 integer arguments are passed in ECX/EDX
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CCIfType<[i32], CCAssignToReg<[ECX, EDX]>>,
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// Otherwise, same as everything else.
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CCDelegateTo<CC_X86_32_Common>
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]>;
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