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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34659 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.8 KiB
C++
103 lines
3.8 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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//===----------------------------------------------------------------------===//
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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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CCMatchType<[i8] , CCAssignToReg<[AL]>>,
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CCMatchType<[i16], CCAssignToReg<[AX]>>,
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CCMatchType<[i32], CCAssignToReg<[EAX, EDX]>>,
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CCMatchType<[i64], CCAssignToReg<[RAX, RDX]>>,
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// Vector types are always returned in XMM0. If the target doesn't have XMM0,
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// it won't have vector types.
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CCMatchType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCAssignToReg<[XMM0]>>
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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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CCMatchType<[f32], CCAssignToReg<[ST0]>>,
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CCMatchType<[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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CCMatchType<[f32], CCMatchIf<"Subtarget->hasSSE2()", CCAssignToReg<[XMM0]>>>,
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CCMatchType<[f64], CCMatchIf<"Subtarget->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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CCMatchType<[f32], CCAssignToReg<[XMM0]>>,
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CCMatchType<[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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CCMatchIfCC<"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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//===----------------------------------------------------------------------===//
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// 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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CCMatchType<[i8, i16], CCPromoteToType<i32>>,
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// The first 6 integer arguments are passed in integer registers.
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CCMatchType<[i32], CCAssignToReg<[EDI, ESI, EDX, ECX, R8D, R9D]>>,
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CCMatchType<[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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CCMatchType<[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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// 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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CCMatchType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>,
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// Vectors get 16-byte stack slots that are 16-byte aligned.
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CCMatchType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
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CCAssignToStack<16, 16>>
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]>;
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