source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/AArch64/aarch64-gep-opt.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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1; RUN: llc -O3 -aarch64-gep-opt=true -verify-machineinstrs %s -o - | FileCheck %s
2; RUN: llc -O3 -aarch64-gep-opt=true -print-after=codegenprepare -mcpu=cyclone < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
3; RUN: llc -O3 -aarch64-gep-opt=true -print-after=codegenprepare -mcpu=cortex-a53 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
4target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
5target triple = "aarch64-linux-gnueabi"
6
7; Following test cases test enabling SeparateConstOffsetFromGEP pass in AArch64
8; backend. If useAA() returns true, it will lower a GEP with multiple indices
9; into GEPs with a single index, otherwise it will lower it into a
10; "ptrtoint+arithmetics+inttoptr" form.
11
12%struct = type { i32, i32, i32, i32, [20 x i32] }
13
14; Check that when two complex GEPs are used in two basic blocks, LLVM can
15; elimilate the common subexpression for the second use.
16define void @test_GEP_CSE([240 x %struct]* %string, i32* %adj, i32 %lib, i64 %idxprom) {
17  %liberties = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 3
18  %1 = load i32, i32* %liberties, align 4
19  %cmp = icmp eq i32 %1, %lib
20  br i1 %cmp, label %if.then, label %if.end
21
22if.then:                                          ; preds = %entry
23  %origin = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 2
24  %2 = load i32, i32* %origin, align 4
25  store i32 %2, i32* %adj, align 4
26  br label %if.end
27
28if.end:                                           ; preds = %if.then, %entry
29  ret void
30}
31
32; CHECK-LABEL: test_GEP_CSE:
33; CHECK: madd
34; CHECK: ldr
35; CHECK-NOT: madd
36; CHECK:ldr
37
38; CHECK-NoAA-LABEL: @test_GEP_CSE(
39; CHECK-NoAA: [[PTR0:%[a-zA-Z0-9]+]] = ptrtoint [240 x %struct]* %string to i64
40; CHECK-NoAA: [[PTR1:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
41; CHECK-NoAA: [[PTR2:%[a-zA-Z0-9]+]] = add i64 [[PTR0]], [[PTR1]]
42; CHECK-NoAA: add i64 [[PTR2]], 23052
43; CHECK-NoAA: inttoptr
44; CHECK-NoAA: if.then:
45; CHECK-NoAA-NOT: ptrtoint
46; CHECK-NoAA-NOT: mul
47; CHECK-NoAA: add i64 [[PTR2]], 23048
48; CHECK-NoAA: inttoptr
49
50; CHECK-UseAA-LABEL: @test_GEP_CSE(
51; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = bitcast [240 x %struct]* %string to i8*
52; CHECK-UseAA: [[IDX:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
53; CHECK-UseAA: [[PTR1:%[a-zA-Z0-9]+]] = getelementptr i8, i8* [[PTR0]], i64 [[IDX]]
54; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23052
55; CHECK-UseAA: bitcast
56; CHECK-UseAA: if.then:
57; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23048
58; CHECK-UseAA: bitcast
59
60%class.my = type { i32, [128 x i32], i32, [256 x %struct.pt]}
61%struct.pt = type { %struct.point*, i32, i32 }
62%struct.point = type { i32, i32 }
63
64; Check when a GEP is used across two basic block, LLVM can sink the address
65; calculation and code gen can generate a better addressing mode for the second
66; use.
67define void @test_GEP_across_BB(%class.my* %this, i64 %idx) {
68  %1 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 1
69  %2 = load i32, i32* %1, align 4
70  %3 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 2
71  %4 = load i32, i32* %3, align 4
72  %5 = icmp eq i32 %2, %4
73  br i1 %5, label %if.true, label %exit
74
75if.true:
76  %6 = shl i32 %4, 1
77  store i32 %6, i32* %3, align 4
78  br label %exit
79
80exit:
81  %7 = add nsw i32 %4, 1
82  store i32 %7, i32* %1, align 4
83  ret void
84}
85; CHECK-LABEL: test_GEP_across_BB:
86; CHECK: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #528]
87; CHECK: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #532]
88; CHECK-NOT: add
89; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #532]
90; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #528]
91
92; CHECK-NoAA-LABEL: test_GEP_across_BB(
93; CHECK-NoAA: add i64 [[TMP:%[a-zA-Z0-9]+]], 528
94; CHECK-NoAA: add i64 [[TMP]], 532
95; CHECK-NoAA: if.true:
96; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = add i64 [[TMP]], 532
97; CHECK-NoAA: exit:
98; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = add i64 [[TMP]], 528
99
100; CHECK-UseAA-LABEL: test_GEP_across_BB(
101; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = getelementptr
102; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 528
103; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 532
104; CHECK-UseAA: if.true:
105; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 532
106; CHECK-UseAA: exit:
107; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 528
108
109%struct.S = type { float, double }
110@struct_array = global [1024 x %struct.S] zeroinitializer, align 16
111
112; The following two test cases check we can extract constant from indices of
113; struct type.
114; The constant offsets are from indices "i64 %idxprom" and "i32 1". As the
115; alloca size of %struct.S is 16, and "i32 1" is the 2rd element whose field
116; offset is 8, the total constant offset is (5 * 16 + 8) = 88.
117define double* @test-struct_1(i32 %i) {
118entry:
119  %add = add nsw i32 %i, 5
120  %idxprom = sext i32 %add to i64
121  %p = getelementptr [1024 x %struct.S], [1024 x %struct.S]* @struct_array, i64 0, i64 %idxprom, i32 1
122  ret double* %p
123}
124; CHECK-NoAA-LABEL: @test-struct_1(
125; CHECK-NoAA-NOT: getelementptr
126; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, 88
127
128; CHECK-UseAA-LABEL: @test-struct_1(
129; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 88
130
131%struct3 = type { i64, i32 }
132%struct2 = type { %struct3, i32 }
133%struct1 = type { i64, %struct2 }
134%struct0 = type { i32, i32, i64*, [100 x %struct1] }
135
136; The constant offsets are from indices "i32 3", "i64 %arrayidx" and "i32 1".
137; "i32 3" is the 4th element whose field offset is 16. The alloca size of
138; %struct1 is 32. "i32 1" is the 2rd element whose field offset is 8. So the
139; total constant offset is 16 + (-2 * 32) + 8 = -40
140define %struct2* @test-struct_2(%struct0* %ptr, i64 %idx) {
141entry:
142  %arrayidx = add nsw i64 %idx, -2
143  %ptr2 = getelementptr %struct0, %struct0* %ptr, i64 0, i32 3, i64 %arrayidx, i32 1
144  ret %struct2* %ptr2
145}
146; CHECK-NoAA-LABEL: @test-struct_2(
147; CHECK-NoAA-NOT: = getelementptr
148; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, -40
149
150; CHECK-UseAA-LABEL: @test-struct_2(
151; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 -40
152
153; Test that when a index is added from two constant, SeparateConstOffsetFromGEP
154; pass does not generate incorrect result.
155define void @test_const_add([3 x i32]* %in) {
156  %inc = add nsw i32 2, 1
157  %idxprom = sext i32 %inc to i64
158  %arrayidx = getelementptr [3 x i32], [3 x i32]* %in, i64 %idxprom, i64 2
159  store i32 0, i32* %arrayidx, align 4
160  ret void
161}
162; CHECK-LABEL: test_const_add:
163; CHECK: str wzr, [x0, #44]
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