1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
; RUN: llc -verify-machineinstrs -O3 -mcpu=pwr7 < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -O3 -print-after=codegenprepare -mcpu=ppc64 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
; RUN: llc -verify-machineinstrs -O3 -print-after=codegenprepare -mcpu=pwr7 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; Following test cases test enabling SeparateConstOffsetFromGEP pass in the PPC
; backend. If useAA() returns true, it will lower a GEP with multiple indices
; into GEPs with a single index, otherwise it will lower it into a
; "ptrtoint+arithmetics+inttoptr" form.
%struct = type { i32, i32, i32, i32, [20 x i32] }
; Check that when two complex GEPs are used in two basic blocks, LLVM can
; elimilate the common subexpression for the second use.
define void @test_GEP_CSE([240 x %struct]* %string, i32* %adj, i32 %lib, i64 %idxprom) {
%liberties = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 3
%1 = load i32, i32* %liberties, align 4
%cmp = icmp eq i32 %1, %lib
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%origin = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 2
%2 = load i32, i32* %origin, align 4
store i32 %2, i32* %adj, align 4
br label %if.end
if.end: ; preds = %if.then, %entry
ret void
}
; CHECK-NoAA-LABEL: @test_GEP_CSE(
; CHECK-NoAA: [[PTR0:%[a-zA-Z0-9]+]] = ptrtoint [240 x %struct]* %string to i64
; CHECK-NoAA: [[PTR1:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
; CHECK-NoAA: [[PTR2:%[a-zA-Z0-9]+]] = add i64 [[PTR0]], [[PTR1]]
; CHECK-NoAA: add i64 [[PTR2]], 23052
; CHECK-NoAA: inttoptr
; CHECK-NoAA: if.then:
; CHECK-NoAA-NOT: ptrtoint
; CHECK-NoAA-NOT: mul
; CHECK-NoAA: add i64 [[PTR2]], 23048
; CHECK-NoAA: inttoptr
; CHECK-UseAA-LABEL: @test_GEP_CSE(
; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = bitcast [240 x %struct]* %string to i8*
; CHECK-UseAA: [[IDX:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
; CHECK-UseAA: [[PTR1:%[a-zA-Z0-9]+]] = getelementptr i8, i8* [[PTR0]], i64 [[IDX]]
; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23052
; CHECK-UseAA: bitcast
; CHECK-UseAA: if.then:
; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23048
; CHECK-UseAA: bitcast
%class.my = type { i32, [128 x i32], i32, [256 x %struct.pt]}
%struct.pt = type { %struct.point*, i32, i32 }
%struct.point = type { i32, i32 }
; Check when a GEP is used across two basic block, LLVM can sink the address
; calculation and code gen can generate a better addressing mode for the second
; use.
define void @test_GEP_across_BB(%class.my* %this, i64 %idx) {
%1 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 1
%2 = load i32, i32* %1, align 4
%3 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 2
%4 = load i32, i32* %3, align 4
%5 = icmp eq i32 %2, %4
br i1 %5, label %if.true, label %exit
if.true:
%6 = shl i32 %4, 1
store i32 %6, i32* %3, align 4
br label %exit
exit:
%7 = add nsw i32 %4, 1
store i32 %7, i32* %1, align 4
ret void
}
; CHECK-LABEL: test_GEP_across_BB:
; CHECK-NOT: lwzu
; CHECK: blr
; CHECK-NoAA-LABEL: test_GEP_across_BB(
; CHECK-NoAA: add i64 [[TMP:%[a-zA-Z0-9]+]], 528
; CHECK-NoAA: add i64 [[TMP]], 532
; CHECK-NoAA: if.true:
; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* {{.*}}, i64 532
; CHECK-NoAA: exit:
; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* {{.*}}, i64 528
; CHECK-UseAA-LABEL: test_GEP_across_BB(
; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = getelementptr
; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 528
; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 532
; CHECK-UseAA: if.true:
; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 532
; CHECK-UseAA: exit:
; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 528
%struct.S = type { float, double }
@struct_array = global [1024 x %struct.S] zeroinitializer, align 16
; The following two test cases check we can extract constant from indices of
; struct type.
; The constant offsets are from indices "i64 %idxprom" and "i32 1". As the
; alloca size of %struct.S is 16, and "i32 1" is the 2rd element whose field
; offset is 8, the total constant offset is (5 * 16 + 8) = 88.
define double* @test-struct_1(i32 %i) {
entry:
%add = add nsw i32 %i, 5
%idxprom = sext i32 %add to i64
%p = getelementptr [1024 x %struct.S], [1024 x %struct.S]* @struct_array, i64 0, i64 %idxprom, i32 1
ret double* %p
}
; CHECK-NoAA-LABEL: @test-struct_1(
; CHECK-NoAA-NOT: getelementptr
; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, 88
; CHECK-UseAA-LABEL: @test-struct_1(
; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 88
%struct3 = type { i64, i32 }
%struct2 = type { %struct3, i32 }
%struct1 = type { i64, %struct2 }
%struct0 = type { i32, i32, i64*, [100 x %struct1] }
; The constant offsets are from indices "i32 3", "i64 %arrayidx" and "i32 1".
; "i32 3" is the 4th element whose field offset is 16. The alloca size of
; %struct1 is 32. "i32 1" is the 2rd element whose field offset is 8. So the
; total constant offset is 16 + (-2 * 32) + 8 = -40
define %struct2* @test-struct_2(%struct0* %ptr, i64 %idx) {
entry:
%arrayidx = add nsw i64 %idx, -2
%ptr2 = getelementptr %struct0, %struct0* %ptr, i64 0, i32 3, i64 %arrayidx, i32 1
ret %struct2* %ptr2
}
; CHECK-NoAA-LABEL: @test-struct_2(
; CHECK-NoAA-NOT: = getelementptr
; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, -40
; CHECK-UseAA-LABEL: @test-struct_2(
; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 -40
; Test that when a index is added from two constant, SeparateConstOffsetFromGEP
; pass does not generate incorrect result.
define void @test_const_add([3 x i32]* %in) {
%inc = add nsw i32 2, 1
%idxprom = sext i32 %inc to i64
%arrayidx = getelementptr [3 x i32], [3 x i32]* %in, i64 %idxprom, i64 2
store i32 0, i32* %arrayidx, align 4
ret void
}
; CHECK-LABEL: test_const_add:
; CHECK: li [[REG:[0-9]+]], 0
; CHECK: stw [[REG]], 44(3)
; CHECK: blr
|
