1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// This file contains rules to decompose builtin compound types
6// (complex,string,slice,interface) into their constituent
7// types. These rules work together with the decomposeBuiltIn
8// pass which handles phis of these types.
9
10(Store {t} _ _ mem) && t.Size() == 0 => mem
11
12// complex ops
13(ComplexReal (ComplexMake real _ )) => real
14(ComplexImag (ComplexMake _ imag )) => imag
15
16(Load <t> ptr mem) && t.IsComplex() && t.Size() == 8 =>
17 (ComplexMake
18 (Load <typ.Float32> ptr mem)
19 (Load <typ.Float32>
20 (OffPtr <typ.Float32Ptr> [4] ptr)
21 mem)
22 )
23(Store {t} dst (ComplexMake real imag) mem) && t.Size() == 8 =>
24 (Store {typ.Float32}
25 (OffPtr <typ.Float32Ptr> [4] dst)
26 imag
27 (Store {typ.Float32} dst real mem))
28(Load <t> ptr mem) && t.IsComplex() && t.Size() == 16 =>
29 (ComplexMake
30 (Load <typ.Float64> ptr mem)
31 (Load <typ.Float64>
32 (OffPtr <typ.Float64Ptr> [8] ptr)
33 mem)
34 )
35(Store {t} dst (ComplexMake real imag) mem) && t.Size() == 16 =>
36 (Store {typ.Float64}
37 (OffPtr <typ.Float64Ptr> [8] dst)
38 imag
39 (Store {typ.Float64} dst real mem))
40
41// string ops
42(StringPtr (StringMake ptr _)) => ptr
43(StringLen (StringMake _ len)) => len
44
45(Load <t> ptr mem) && t.IsString() =>
46 (StringMake
47 (Load <typ.BytePtr> ptr mem)
48 (Load <typ.Int>
49 (OffPtr <typ.IntPtr> [config.PtrSize] ptr)
50 mem))
51(Store dst (StringMake ptr len) mem) =>
52 (Store {typ.Int}
53 (OffPtr <typ.IntPtr> [config.PtrSize] dst)
54 len
55 (Store {typ.BytePtr} dst ptr mem))
56
57// slice ops
58(SlicePtr (SliceMake ptr _ _ )) => ptr
59(SliceLen (SliceMake _ len _)) => len
60(SliceCap (SliceMake _ _ cap)) => cap
61(SlicePtrUnchecked (SliceMake ptr _ _ )) => ptr
62
63(Load <t> ptr mem) && t.IsSlice() =>
64 (SliceMake
65 (Load <t.Elem().PtrTo()> ptr mem)
66 (Load <typ.Int>
67 (OffPtr <typ.IntPtr> [config.PtrSize] ptr)
68 mem)
69 (Load <typ.Int>
70 (OffPtr <typ.IntPtr> [2*config.PtrSize] ptr)
71 mem))
72(Store {t} dst (SliceMake ptr len cap) mem) =>
73 (Store {typ.Int}
74 (OffPtr <typ.IntPtr> [2*config.PtrSize] dst)
75 cap
76 (Store {typ.Int}
77 (OffPtr <typ.IntPtr> [config.PtrSize] dst)
78 len
79 (Store {t.Elem().PtrTo()} dst ptr mem)))
80
81// interface ops
82(ITab (IMake itab _)) => itab
83(IData (IMake _ data)) => data
84
85(Load <t> ptr mem) && t.IsInterface() =>
86 (IMake
87 (Load <typ.Uintptr> ptr mem)
88 (Load <typ.BytePtr>
89 (OffPtr <typ.BytePtrPtr> [config.PtrSize] ptr)
90 mem))
91(Store dst (IMake itab data) mem) =>
92 (Store {typ.BytePtr}
93 (OffPtr <typ.BytePtrPtr> [config.PtrSize] dst)
94 data
95 (Store {typ.Uintptr} dst itab mem))
96
97// Helpers for expand calls
98// Some of these are copied from generic.rules
99
100(IMake _typ (StructMake val)) => (IMake _typ val)
101(StructSelect [0] (IData x)) => (IData x)
102
103(StructSelect [i] x:(StructMake ___)) => x.Args[i]
104
105// Special case coming from immediate interface rewriting
106// Typical case: (StructSelect [0] (IData (IMake typ dat)) rewrites to (StructSelect [0] dat)
107// but because the interface is immediate, the type of "IData" is a one-element struct containing
108// a pointer that is not the pointer type of dat (can be a *uint8).
109// More annoying case: (ArraySelect[0] (StructSelect[0] isAPtr))
110// There, result of the StructSelect is an Array (not a pointer) and
111// the pre-rewrite input to the ArraySelect is a struct, not a pointer.
112(StructSelect [0] x) && x.Type.IsPtrShaped() => x
113(ArraySelect [0] x) && x.Type.IsPtrShaped() => x
114
115// These, too. Bits is bits.
116(ArrayMake1 x) && x.Type.IsPtrShaped() => x
117(StructMake x) && x.Type.IsPtrShaped() => x
118
119
120(Store _ (StructMake ___) _) => rewriteStructStore(v)
121
122(ArraySelect (ArrayMake1 x)) => x
123(ArraySelect [0] (IData x)) => (IData x)
124
125(Store dst (ArrayMake1 e) mem) => (Store {e.Type} dst e mem)
126
127// NOTE removed must-not-be-SSA condition.
128(ArraySelect [i] x:(Load <t> ptr mem)) =>
129 @x.Block (Load <v.Type> (OffPtr <v.Type.PtrTo()> [t.Elem().Size()*i] ptr) mem)
130
131(StringPtr x:(Load <t> ptr mem)) && t.IsString() => @x.Block (Load <typ.BytePtr> ptr mem)
132(StringLen x:(Load <t> ptr mem)) && t.IsString() => @x.Block (Load <typ.Int>
133 (OffPtr <typ.IntPtr> [config.PtrSize] ptr)
134 mem)
135
136// NOTE removed must-not-be-SSA condition.
137(StructSelect [i] x:(Load <t> ptr mem)) =>
138 @x.Block (Load <v.Type> (OffPtr <v.Type.PtrTo()> [t.FieldOff(int(i))] ptr) mem)
139
140(ITab x:(Load <t> ptr mem)) && t.IsInterface() => @x.Block (Load <typ.Uintptr> ptr mem)
141
142(IData x:(Load <t> ptr mem)) && t.IsInterface() => @x.Block (Load <typ.BytePtr>
143 (OffPtr <typ.BytePtrPtr> [config.PtrSize] ptr)
144 mem)
145
146(SlicePtr x:(Load <t> ptr mem)) && t.IsSlice() => @x.Block (Load <t.Elem().PtrTo()> ptr mem)
147(SliceLen x:(Load <t> ptr mem)) && t.IsSlice() => @x.Block (Load <typ.Int>
148 (OffPtr <typ.IntPtr> [config.PtrSize] ptr)
149 mem)
150(SliceCap x:(Load <t> ptr mem)) && t.IsSlice() => @x.Block (Load <typ.Int>
151 (OffPtr <typ.IntPtr> [2*config.PtrSize] ptr)
152 mem)
153
154(ComplexReal x:(Load <t> ptr mem)) && t.IsComplex() && t.Size() == 8 => @x.Block (Load <typ.Float32> ptr mem)
155(ComplexImag x:(Load <t> ptr mem)) && t.IsComplex() && t.Size() == 8 => @x.Block (Load <typ.Float32>
156 (OffPtr <typ.Float32Ptr> [4] ptr)
157 mem)
158
159(ComplexReal x:(Load <t> ptr mem)) && t.IsComplex() && t.Size() == 16 => @x.Block (Load <typ.Float64> ptr mem)
160(ComplexImag x:(Load <t> ptr mem)) && t.IsComplex() && t.Size() == 16 => @x.Block (Load <typ.Float64>
161 (OffPtr <typ.Float64Ptr> [8] ptr)
162 mem)
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