1 ; RUN: llc -O3 -aarch64-enable-gep-opt=true -verify-machineinstrs %s -o - | FileCheck %s
2 ; RUN: llc -O3 -aarch64-enable-gep-opt=true -mattr=-use-aa -print-after=codegenprepare < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
3 ; RUN: llc -O3 -aarch64-enable-gep-opt=true -mattr=+use-aa -print-after=codegenprepare < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
4 ; RUN: llc -O3 -aarch64-enable-gep-opt=true -print-after=codegenprepare -mcpu=cyclone < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
5 ; RUN: llc -O3 -aarch64-enable-gep-opt=true -print-after=codegenprepare -mcpu=cortex-a53 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
7 target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
8 target triple = "aarch64-linux-gnueabi"
10 ; Following test cases test enabling SeparateConstOffsetFromGEP pass in AArch64
11 ; backend. If useAA() returns true, it will lower a GEP with multiple indices
12 ; into GEPs with a single index, otherwise it will lower it into a
13 ; "ptrtoint+arithmetics+inttoptr" form.
15 %struct = type { i32, i32, i32, i32, [20 x i32] }
17 ; Check that when two complex GEPs are used in two basic blocks, LLVM can
18 ; elimilate the common subexpression for the second use.
19 define void @test_GEP_CSE([240 x %struct]* %string, i32* %adj, i32 %lib, i64 %idxprom) {
20 %liberties = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 3
21 %1 = load i32, i32* %liberties, align 4
22 %cmp = icmp eq i32 %1, %lib
23 br i1 %cmp, label %if.then, label %if.end
25 if.then: ; preds = %entry
26 %origin = getelementptr [240 x %struct], [240 x %struct]* %string, i64 1, i64 %idxprom, i32 2
27 %2 = load i32, i32* %origin, align 4
28 store i32 %2, i32* %adj, align 4
31 if.end: ; preds = %if.then, %entry
35 ; CHECK-LABEL: test_GEP_CSE:
41 ; CHECK-NoAA-LABEL: @test_GEP_CSE(
42 ; CHECK-NoAA: [[PTR0:%[a-zA-Z0-9]+]] = ptrtoint [240 x %struct]* %string to i64
43 ; CHECK-NoAA: [[PTR1:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
44 ; CHECK-NoAA: [[PTR2:%[a-zA-Z0-9]+]] = add i64 [[PTR0]], [[PTR1]]
45 ; CHECK-NoAA: add i64 [[PTR2]], 23052
46 ; CHECK-NoAA: inttoptr
47 ; CHECK-NoAA: if.then:
48 ; CHECK-NoAA-NOT: ptrtoint
50 ; CHECK-NoAA: add i64 [[PTR2]], 23048
51 ; CHECK-NoAA: inttoptr
53 ; CHECK-UseAA-LABEL: @test_GEP_CSE(
54 ; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = bitcast [240 x %struct]* %string to i8*
55 ; CHECK-UseAA: [[IDX:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
56 ; CHECK-UseAA: [[PTR1:%[a-zA-Z0-9]+]] = getelementptr i8, i8* [[PTR0]], i64 [[IDX]]
57 ; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23052
58 ; CHECK-UseAA: bitcast
59 ; CHECK-UseAA: if.then:
60 ; CHECK-UseAA: getelementptr i8, i8* [[PTR1]], i64 23048
61 ; CHECK-UseAA: bitcast
63 %class.my = type { i32, [128 x i32], i32, [256 x %struct.pt]}
64 %struct.pt = type { %struct.point*, i32, i32 }
65 %struct.point = type { i32, i32 }
67 ; Check when a GEP is used across two basic block, LLVM can sink the address
68 ; calculation and code gen can generate a better addressing mode for the second
70 define void @test_GEP_across_BB(%class.my* %this, i64 %idx) {
71 %1 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 1
72 %2 = load i32, i32* %1, align 4
73 %3 = getelementptr %class.my, %class.my* %this, i64 0, i32 3, i64 %idx, i32 2
74 %4 = load i32, i32* %3, align 4
75 %5 = icmp eq i32 %2, %4
76 br i1 %5, label %if.true, label %exit
80 store i32 %6, i32* %3, align 4
84 %7 = add nsw i32 %4, 1
85 store i32 %7, i32* %1, align 4
88 ; CHECK-LABEL: test_GEP_across_BB:
89 ; CHECK: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #528]
90 ; CHECK: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #532]
92 ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #532]
93 ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #528]
95 ; CHECK-NoAA-LABEL: test_GEP_across_BB(
96 ; CHECK-NoAA: add i64 [[TMP:%[a-zA-Z0-9]+]], 528
97 ; CHECK-NoAA: add i64 [[TMP]], 532
98 ; CHECK-NoAA: if.true:
99 ; CHECK-NoAA: inttoptr
100 ; CHECK-NoAA: bitcast
101 ; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, {{.*}}, i64 532
103 ; CHECK-NoAA: inttoptr
104 ; CHECK-NoAA: bitcast
105 ; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, {{.*}}, i64 528
107 ; CHECK-UseAA-LABEL: test_GEP_across_BB(
108 ; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = getelementptr
109 ; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 528
110 ; CHECK-UseAA: getelementptr i8, i8* [[PTR0]], i64 532
111 ; CHECK-UseAA: if.true:
112 ; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 532
114 ; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8, i8* [[PTR0]], i64 528
116 %struct.S = type { float, double }
117 @struct_array = global [1024 x %struct.S] zeroinitializer, align 16
119 ; The following two test cases check we can extract constant from indices of
121 ; The constant offsets are from indices "i64 %idxprom" and "i32 1". As the
122 ; alloca size of %struct.S is 16, and "i32 1" is the 2rd element whose field
123 ; offset is 8, the total constant offset is (5 * 16 + 8) = 88.
124 define double* @test-struct_1(i32 %i) {
126 %add = add nsw i32 %i, 5
127 %idxprom = sext i32 %add to i64
128 %p = getelementptr [1024 x %struct.S], [1024 x %struct.S]* @struct_array, i64 0, i64 %idxprom, i32 1
131 ; CHECK-NoAA-LABEL: @test-struct_1(
132 ; CHECK-NoAA-NOT: getelementptr
133 ; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, 88
135 ; CHECK-UseAA-LABEL: @test-struct_1(
136 ; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 88
138 %struct3 = type { i64, i32 }
139 %struct2 = type { %struct3, i32 }
140 %struct1 = type { i64, %struct2 }
141 %struct0 = type { i32, i32, i64*, [100 x %struct1] }
143 ; The constant offsets are from indices "i32 3", "i64 %arrayidx" and "i32 1".
144 ; "i32 3" is the 4th element whose field offset is 16. The alloca size of
145 ; %struct1 is 32. "i32 1" is the 2rd element whose field offset is 8. So the
146 ; total constant offset is 16 + (-2 * 32) + 8 = -40
147 define %struct2* @test-struct_2(%struct0* %ptr, i64 %idx) {
149 %arrayidx = add nsw i64 %idx, -2
150 %ptr2 = getelementptr %struct0, %struct0* %ptr, i64 0, i32 3, i64 %arrayidx, i32 1
153 ; CHECK-NoAA-LABEL: @test-struct_2(
154 ; CHECK-NoAA-NOT: = getelementptr
155 ; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, -40
157 ; CHECK-UseAA-LABEL: @test-struct_2(
158 ; CHECK-UseAA: getelementptr i8, i8* %{{[a-zA-Z0-9]+}}, i64 -40
160 ; Test that when a index is added from two constant, SeparateConstOffsetFromGEP
161 ; pass does not generate incorrect result.
162 define void @test_const_add([3 x i32]* %in) {
163 %inc = add nsw i32 2, 1
164 %idxprom = sext i32 %inc to i64
165 %arrayidx = getelementptr [3 x i32], [3 x i32]* %in, i64 %idxprom, i64 2
166 store i32 0, i32* %arrayidx, align 4
169 ; CHECK-LABEL: test_const_add:
170 ; CHECK: str wzr, [x0, #44]