1 //===-- VECallingConv.td - Calling Conventions VE ----------*- tablegen -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This describes the calling conventions for the VE architectures.
11 //===----------------------------------------------------------------------===//
13 //===----------------------------------------------------------------------===//
15 //===----------------------------------------------------------------------===//
16 def CC_VE_C_Stack: CallingConv<[
17 // F128 are assigned to the stack in 16-byte aligned units
18 CCIfType<[f128], CCAssignToStackWithShadow<16, 16, [SX7]>>,
20 // All of the rest are assigned to the stack in 8-byte aligned units.
24 ///// C Calling Convention (VE ABI v2.1) /////
26 // Reference: https://www.nec.com/en/global/prod/hpc/aurora/document/VE-ABI_v2.1.pdf
28 def CC_VE_C : CallingConv<[
29 // All arguments get passed in generic registers if there is space.
31 // Promote i1/i8/i16/i32 arguments to i64.
32 CCIfType<[i1, i8, i16, i32], CCPromoteToType<i64>>,
34 // Convert float arguments to i64 with padding.
39 CCIfType<[f32], CCBitConvertToType<i64>>,
41 // bool, char, int, enum, long, long long, float, double
42 // --> generic 64 bit registers
44 CCAssignToReg<[SX0, SX1, SX2, SX3, SX4, SX5, SX6, SX7]>>,
46 // long double --> pair of generic 64 bit registers
48 // NOTE: If Q1 is allocated while SX1 is free, llvm tries to allocate SX1 for
49 // following operands, this masks SX1 to avoid such behavior.
51 CCAssignToRegWithShadow<[Q0, Q1, Q2, Q3],
52 [SX0, SX1, SX3, SX5]>>,
54 // Alternatively, they are assigned to the stack in 8-byte aligned units.
55 CCDelegateTo<CC_VE_C_Stack>
58 ///// Standard vararg C Calling Convention (VE ABI v2.1) /////
59 // All arguments get passed in stack for varargs function or non-prototyped
61 def CC_VE2 : CallingConv<[
62 // Promote i1/i8/i16/i32 arguments to i64.
63 CCIfType<[i1, i8, i16, i32], CCPromoteToType<i64>>,
65 // Convert float arguments to i64 with padding.
70 CCIfType<[f32], CCBitConvertToType<i64>>,
72 // F128 are assigned to the stack in 16-byte aligned units
73 CCIfType<[f128], CCAssignToStack<16, 16>>,
78 def RetCC_VE_C : CallingConv<[
79 // Promote i1/i8/i16/i32 return values to i64.
80 CCIfType<[i1, i8, i16, i32], CCPromoteToType<i64>>,
82 // Convert float return values to i64 with padding.
87 CCIfType<[f32], CCBitConvertToType<i64>>,
89 // bool, char, int, enum, long, long long, float, double
90 // --> generic 64 bit registers
92 CCAssignToReg<[SX0, SX1, SX2, SX3, SX4, SX5, SX6, SX7]>>,
94 // long double --> pair of generic 64 bit registers
96 CCAssignToRegWithShadow<[Q0, Q1, Q2, Q3],
97 [SX0, SX1, SX3, SX5]>>,
100 ///// Custom fastcc /////
102 // This passes vector params and return values in registers. Scalar values are
103 // handled conforming to the standard cc.
104 def CC_VE_Fast : CallingConv<[
105 // vector --> generic vector registers
106 CCIfType<[v256i32, v256f32, v256i64, v256f64],
107 CCAssignToReg<[V0, V1, V2, V3, V4, V5, V6, V7]>>,
108 // TODO: make this conditional on packed mode
109 CCIfType<[v512i32, v512f32],
110 CCAssignToReg<[V0, V1, V2, V3, V4, V5, V6, V7]>>,
112 // vector mask --> generic vector mask registers
114 CCAssignToReg<[VM1, VM2, VM3, VM4, VM5, VM6, VM7]>>,
116 // pair of vector mask --> generic vector mask registers
118 CCAssignToRegWithShadow<[VMP1, VMP2, VMP3],
121 // Follow the standard C CC for scalars.
122 CCDelegateTo<CC_VE_C>
125 def RetCC_VE_Fast : CallingConv<[
126 // vector --> generic vector registers
127 CCIfType<[v256i32, v256f32, v256i64, v256f64],
128 CCAssignToReg<[V0, V1, V2, V3, V4, V5, V6, V7]>>,
129 // TODO: make this conditional on packed mode
130 CCIfType<[v512i32, v512f32],
131 CCAssignToReg<[V0, V1, V2, V3, V4, V5, V6, V7]>>,
133 // vector mask --> generic vector mask registers
135 CCAssignToReg<[VM1, VM2, VM3, VM4, VM5, VM6, VM7]>>,
137 // pair of vector mask --> generic vector mask registers
139 CCAssignToRegWithShadow<[VMP1, VMP2, VMP3],
142 // Follow the standard C CC for scalars.
143 CCDelegateTo<RetCC_VE_C>
146 // Callee-saved registers
147 def CSR : CalleeSavedRegs<(add (sequence "SX%u", 18, 33))>;
148 def CSR_NoRegs : CalleeSavedRegs<(add)>;
150 // PreserveAll (clobbers s62,s63) - used for ve_grow_stack
151 def CSR_preserve_all : CalleeSavedRegs<(add (sequence "SX%u", 0, 61),
152 (sequence "V%u", 0, 63),
153 (sequence "VM%u", 1, 15))>;