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 4 target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128" 5 target 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. 16 define 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 22 if.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 28 if.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. 67 define 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 75 if.true: 76 %6 = shl i32 %4, 1 77 store i32 %6, i32* %3, align 4 78 br label %exit 79 80 exit: 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. 117 define double* @test-struct_1(i32 %i) { 118 entry: 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 = -40 140 define %struct2* @test-struct_2(%struct0* %ptr, i64 %idx) { 141 entry: 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. 155 define 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] 164
