1// Copyright 2020 ConsenSys Software Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package amd64
16
17func (f *FFAmd64) generateMulBy3() {
18	f.Comment("MulBy3(x *Element)")
19	stackSize := f.StackSize(1+f.NbWords*2, 0, 0)
20	registers := f.FnHeader("MulBy3", stackSize, 8)
21	defer f.AssertCleanStack(stackSize, 0)
22	// registers
23	x := registers.Pop()
24	t := registers.PopN(f.NbWords)
25
26	f.MOVQ("x+0(FP)", x)
27
28	f.Mov(x, t)
29	f.Add(t, t)
30
31	f.Reduce(&registers, t)
32	f.Add(x, t)
33	f.Reduce(&registers, t)
34	f.Mov(t, x)
35
36	f.RET()
37}
38
39func (f *FFAmd64) generateMulBy5() {
40	f.Comment("MulBy5(x *Element)")
41	stackSize := f.StackSize(1+f.NbWords*2, 0, 0)
42	registers := f.FnHeader("MulBy5", stackSize, 8)
43	defer f.AssertCleanStack(stackSize, 0)
44
45	// registers
46	x := registers.Pop()
47	t := registers.PopN(f.NbWords)
48
49	f.MOVQ("x+0(FP)", x)
50
51	f.Mov(x, t)
52	f.Add(t, t)
53	f.Reduce(&registers, t)
54	f.Add(t, t)
55	f.Reduce(&registers, t)
56	f.Add(x, t)
57	f.Reduce(&registers, t)
58
59	f.Mov(t, x)
60	f.RET()
61}
62
63func (f *FFAmd64) generateMulBy13() {
64	f.Comment("MulBy13(x *Element)")
65	stackSize := f.StackSize(1+f.NbWords*3, 0, 0)
66	registers := f.FnHeader("MulBy13", stackSize, 8)
67	defer f.AssertCleanStack(stackSize, 0)
68
69	// registers
70	x := f.Pop(&registers)
71	t := f.PopN(&registers)
72	s := f.PopN(&registers)
73	u := f.PopN(&registers)
74
75	f.MOVQ("x+0(FP)", x)
76
77	f.Mov(x, t)
78
79	f.Add(t, t)
80	f.ReduceElement(t, s)
81	f.Add(t, t)
82	f.ReduceElement(t, u)
83
84	f.Mov(t, u) // u == 4
85
86	f.Add(t, t) // t == 8
87	f.ReduceElement(t, s)
88
89	f.Add(u, t) // t == 12
90	f.ReduceElement(t, s)
91
92	f.Add(x, t) // t == 13
93	f.ReduceElement(t, s)
94
95	f.Mov(t, x)
96	f.RET()
97
98	f.Push(&registers, x)
99	f.Push(&registers, t...)
100	f.Push(&registers, u...)
101	f.Push(&registers, s...)
102}
103