-//===- X86CallingConv.td - Calling Conventions X86 32/64 ---*- tablegen -*-===//
-//
+//===-- X86CallingConv.td - Calling Conventions X86 32/64 --*- tablegen -*-===//
+//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This describes the calling conventions for the X86-32 and X86-64
// up in AX and AH, which overlap. Front-ends wishing to conform to the ABI
// for functions that return two i8 values are currently expected to pack the
// values into an i16 (which uses AX, and thus AL:AH).
- CCIfType<[i8] , CCAssignToReg<[AL, DL]>>,
- CCIfType<[i16], CCAssignToReg<[AX, DX]>>,
- CCIfType<[i32], CCAssignToReg<[EAX, EDX]>>,
- CCIfType<[i64], CCAssignToReg<[RAX, RDX]>>,
+ //
+ // For code that doesn't care about the ABI, we allow returning more than two
+ // integer values in registers.
+ CCIfType<[i8] , CCAssignToReg<[AL, DL, CL]>>,
+ CCIfType<[i16], CCAssignToReg<[AX, DX, CX]>>,
+ CCIfType<[i32], CCAssignToReg<[EAX, EDX, ECX]>>,
+ CCIfType<[i64], CCAssignToReg<[RAX, RDX, RCX]>>,
// Vector types are returned in XMM0 and XMM1, when they fit. XMM2 and XMM3
// can only be used by ABI non-compliant code. If the target doesn't have XMM
// can only be used by ABI non-compliant code. This vector type is only
// supported while using the AVX target feature.
CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64],
- CCIfSubtarget<"hasAVX()", CCAssignToReg<[YMM0,YMM1,YMM2,YMM3]>>>,
+ CCAssignToReg<[YMM0,YMM1,YMM2,YMM3]>>,
// MMX vector types are always returned in MM0. If the target doesn't have
// MM0, it doesn't support these vector types.
- CCIfType<[x86mmx, v1i64], CCAssignToReg<[MM0]>>,
+ CCIfType<[x86mmx], CCAssignToReg<[MM0]>>,
// Long double types are always returned in ST0 (even with SSE).
CCIfType<[f80], CCAssignToReg<[ST0, ST1]>>
// weirdly; this is really the sse-regparm calling convention) in which
// case they use XMM0, otherwise it is the same as the common X86 calling
// conv.
- CCIfInReg<CCIfSubtarget<"hasXMMInt()",
+ CCIfInReg<CCIfSubtarget<"hasSSE2()",
CCIfType<[f32, f64], CCAssignToReg<[XMM0,XMM1,XMM2]>>>>,
CCIfType<[f32,f64], CCAssignToReg<[ST0, ST1]>>,
CCDelegateTo<RetCC_X86Common>
// SSE2.
// This can happen when a float, 2 x float, or 3 x float vector is split by
// target lowering, and is returned in 1-3 sse regs.
- CCIfType<[f32], CCIfSubtarget<"hasXMMInt()", CCAssignToReg<[XMM0,XMM1,XMM2]>>>,
- CCIfType<[f64], CCIfSubtarget<"hasXMMInt()", CCAssignToReg<[XMM0,XMM1,XMM2]>>>,
+ CCIfType<[f32], CCIfSubtarget<"hasSSE2()", CCAssignToReg<[XMM0,XMM1,XMM2]>>>,
+ CCIfType<[f64], CCIfSubtarget<"hasSSE2()", CCAssignToReg<[XMM0,XMM1,XMM2]>>>,
// For integers, ECX can be used as an extra return register
CCIfType<[i8], CCAssignToReg<[AL, DL, CL]>>,
CCIfType<[f32], CCAssignToReg<[XMM0, XMM1]>>,
CCIfType<[f64], CCAssignToReg<[XMM0, XMM1]>>,
- // MMX vector types are always returned in XMM0 except for v1i64 which is
- // returned in RAX. This disagrees with ABI documentation but is bug
- // compatible with gcc.
- CCIfType<[v1i64], CCAssignToReg<[RAX]>>,
+ // MMX vector types are always returned in XMM0.
CCIfType<[x86mmx], CCAssignToReg<[XMM0, XMM1]>>,
CCDelegateTo<RetCC_X86Common>
]>;
// X86-Win64 C return-value convention.
def RetCC_X86_Win64_C : CallingConv<[
// The X86-Win64 calling convention always returns __m64 values in RAX.
- CCIfType<[x86mmx, v1i64], CCBitConvertToType<i64>>,
-
- // And FP in XMM0 only.
- CCIfType<[f32], CCAssignToReg<[XMM0]>>,
- CCIfType<[f64], CCAssignToReg<[XMM0]>>,
+ CCIfType<[x86mmx], CCBitConvertToType<i64>>,
// Otherwise, everything is the same as 'normal' X86-64 C CC.
CCDelegateTo<RetCC_X86_64_C>
// The 'nest' parameter, if any, is passed in R10.
CCIfNest<CCAssignToReg<[R10]>>,
- // The first 6 v1i64 vector arguments are passed in GPRs on Darwin.
- CCIfType<[v1i64],
- CCIfSubtarget<"isTargetDarwin()",
- CCBitConvertToType<i64>>>,
-
// The first 6 integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToReg<[EDI, ESI, EDX, ECX, R8D, R9D]>>,
CCIfType<[i64], CCAssignToReg<[RDI, RSI, RDX, RCX, R8 , R9 ]>>,
- // The first 8 MMX (except for v1i64) vector arguments are passed in XMM
- // registers on Darwin.
+ // The first 8 MMX vector arguments are passed in XMM registers on Darwin.
CCIfType<[x86mmx],
CCIfSubtarget<"isTargetDarwin()",
- CCIfSubtarget<"hasXMMInt()",
+ CCIfSubtarget<"hasSSE2()",
CCPromoteToType<v2i64>>>>,
// The first 8 FP/Vector arguments are passed in XMM registers.
CCIfType<[f32, f64, v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
- CCIfSubtarget<"hasXMM()",
+ CCIfSubtarget<"hasSSE1()",
CCAssignToReg<[XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7]>>>,
- // The first 8 256-bit vector arguments are passed in YMM registers.
- CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64],
- CCIfSubtarget<"hasAVX()",
- CCAssignToReg<[YMM0, YMM1, YMM2, YMM3, YMM4, YMM5, YMM6, YMM7]>>>,
+ // The first 8 256-bit vector arguments are passed in YMM registers, unless
+ // this is a vararg function.
+ // FIXME: This isn't precisely correct; the x86-64 ABI document says that
+ // fixed arguments to vararg functions are supposed to be passed in
+ // registers. Actually modeling that would be a lot of work, though.
+ CCIfNotVarArg<CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64],
+ CCIfSubtarget<"hasAVX()",
+ CCAssignToReg<[YMM0, YMM1, YMM2, YMM3,
+ YMM4, YMM5, YMM6, YMM7]>>>>,
// Integer/FP values get stored in stack slots that are 8 bytes in size and
// 8-byte aligned if there are no more registers to hold them.
// 256-bit vectors get 32-byte stack slots that are 32-byte aligned.
CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64],
- CCAssignToStack<32, 32>>,
-
- // __m64 vectors get 8-byte stack slots that are 8-byte aligned.
- CCIfType<[x86mmx,v1i64], CCAssignToStack<8, 8>>
+ CCAssignToStack<32, 32>>
]>;
// Calling convention used on Win64
// 128 bit vectors are passed by pointer
CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCPassIndirect<i64>>,
+
+ // 256 bit vectors are passed by pointer
+ CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64], CCPassIndirect<i64>>,
+
// The first 4 MMX vector arguments are passed in GPRs.
- CCIfType<[x86mmx, v1i64], CCBitConvertToType<i64>>,
+ CCIfType<[x86mmx], CCBitConvertToType<i64>>,
// The first 4 integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToRegWithShadow<[ECX , EDX , R8D , R9D ],
// Do not pass the sret argument in RCX, the Win64 thiscall calling
// convention requires "this" to be passed in RCX.
- CCIfCC<"CallingConv::Win64_ThisCall",
+ CCIfCC<"CallingConv::X86_ThisCall",
CCIfSRet<CCIfType<[i64], CCAssignToRegWithShadow<[RDX , R8 , R9 ],
[XMM1, XMM2, XMM3]>>>>,
// Long doubles get stack slots whose size and alignment depends on the
// subtarget.
- CCIfType<[f80], CCAssignToStack<0, 0>>,
-
- // __m64 vectors get 8-byte stack slots that are 8-byte aligned.
- CCIfType<[x86mmx,v1i64], CCAssignToStack<8, 8>>
+ CCIfType<[f80], CCAssignToStack<0, 0>>
]>;
def CC_X86_64_GHC : CallingConv<[
// Pass in STG registers: F1, F2, F3, F4, D1, D2
CCIfType<[f32, f64, v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
- CCIfSubtarget<"hasXMM()",
+ CCIfSubtarget<"hasSSE1()",
CCAssignToReg<[XMM1, XMM2, XMM3, XMM4, XMM5, XMM6]>>>
]>;
// The first 3 float or double arguments, if marked 'inreg' and if the call
// is not a vararg call and if SSE2 is available, are passed in SSE registers.
CCIfNotVarArg<CCIfInReg<CCIfType<[f32,f64],
- CCIfSubtarget<"hasXMMInt()",
+ CCIfSubtarget<"hasSSE2()",
CCAssignToReg<[XMM0,XMM1,XMM2]>>>>>,
- // The first 3 __m64 (except for v1i64) vector arguments are passed in mmx
- // registers if the call is not a vararg call.
+ // The first 3 __m64 vector arguments are passed in mmx registers if the
+ // call is not a vararg call.
CCIfNotVarArg<CCIfType<[x86mmx],
CCAssignToReg<[MM0, MM1, MM2]>>>,
// __m64 vectors get 8-byte stack slots that are 4-byte aligned. They are
// passed in the parameter area.
- CCIfType<[x86mmx,v1i64], CCAssignToStack<8, 4>>]>;
+ CCIfType<[x86mmx], CCAssignToStack<8, 4>>]>;
def CC_X86_32_C : CallingConv<[
// Promote i8/i16 arguments to i32.
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
- // The 'nest' parameter, if any, is passed in EAX.
- CCIfNest<CCAssignToReg<[EAX]>>,
+ // Pass sret arguments indirectly through EAX
+ CCIfSRet<CCAssignToReg<[EAX]>>,
// The first integer argument is passed in ECX
CCIfType<[i32], CCAssignToReg<[ECX]>>,
// The first 3 float or double arguments, if the call is not a vararg
// call and if SSE2 is available, are passed in SSE registers.
CCIfNotVarArg<CCIfType<[f32,f64],
- CCIfSubtarget<"hasXMMInt()",
+ CCIfSubtarget<"hasSSE2()",
CCAssignToReg<[XMM0,XMM1,XMM2]>>>>,
// Doubles get 8-byte slots that are 8-byte aligned.
CCIfSubtarget<"is64Bit()", CCDelegateTo<CC_X86_64>>,
CCDelegateTo<CC_X86_32>
]>;
+
+//===----------------------------------------------------------------------===//
+// Callee-saved Registers.
+//===----------------------------------------------------------------------===//
+
+def CSR_NoRegs : CalleeSavedRegs<(add)>;
+
+def CSR_32 : CalleeSavedRegs<(add ESI, EDI, EBX, EBP)>;
+def CSR_64 : CalleeSavedRegs<(add RBX, R12, R13, R14, R15, RBP)>;
+
+def CSR_32EHRet : CalleeSavedRegs<(add EAX, EDX, CSR_32)>;
+def CSR_64EHRet : CalleeSavedRegs<(add RAX, RDX, CSR_64)>;
+
+def CSR_Win64 : CalleeSavedRegs<(add RBX, RBP, RDI, RSI, R12, R13, R14, R15,
+ (sequence "XMM%u", 6, 15))>;
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