5f01a626dd
When inferring that a GEP of a global variable is inbounds because there is no notional overindexing, we need to check that the global value type and the GEP source element type match. This was not necessary with typed pointers (because we would have a bitcast in between), but is necessary with opaque pointers. We should be able to recover some of the safe cases by performing an offset based inbounds inference in DL-aware ConstantFolding.
104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
// RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu -O2 -disable-llvm-passes | FileCheck %s --check-prefix=CHECK-OPT
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struct A { ~A(); int n; char c[3]; };
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struct B { [[no_unique_address]] A a; char k; };
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// CHECK-DAG: @b ={{.*}} global { i32, [3 x i8], i8 } { i32 1, [3 x i8] c"\02\03\04", i8 5 }
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B b = {1, 2, 3, 4, 5};
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struct C : A {};
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struct D : C {};
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struct E { int e; [[no_unique_address]] D d; char k; };
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// CHECK-DAG: @e ={{.*}} global { i32, i32, [3 x i8], i8 } { i32 1, i32 2, [3 x i8] c"\03\04\05", i8 6 }
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E e = {1, 2, 3, 4, 5, 6};
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struct Empty1 {};
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struct Empty2 {};
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struct Empty3 {};
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struct HasEmpty {
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[[no_unique_address]] Empty1 e1;
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int a;
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[[no_unique_address]] Empty2 e2;
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int b;
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[[no_unique_address]] Empty3 e3;
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};
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// CHECK-DAG: @he ={{.*}} global %{{[^ ]*}} { i32 1, i32 2 }
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HasEmpty he = {{}, 1, {}, 2, {}};
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struct HasEmptyDuplicates {
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[[no_unique_address]] Empty1 e1; // +0
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int a;
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[[no_unique_address]] Empty1 e2; // +4
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int b;
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[[no_unique_address]] Empty1 e3; // +8
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};
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// CHECK-DAG: @off1 ={{.*}} global i64 0
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Empty1 HasEmptyDuplicates::*off1 = &HasEmptyDuplicates::e1;
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// CHECK-DAG: @off2 ={{.*}} global i64 4
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Empty1 HasEmptyDuplicates::*off2 = &HasEmptyDuplicates::e2;
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// CHECK-DAG: @off3 ={{.*}} global i64 8
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Empty1 HasEmptyDuplicates::*off3 = &HasEmptyDuplicates::e3;
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// CHECK-DAG: @hed ={{.*}} global %{{[^ ]*}} { i32 1, i32 2, [4 x i8] undef }
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HasEmptyDuplicates hed = {{}, 1, {}, 2, {}};
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struct __attribute__((packed, aligned(2))) PackedAndPadded {
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~PackedAndPadded();
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char c;
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int n;
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};
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struct WithPackedAndPadded {
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[[no_unique_address]] PackedAndPadded pap;
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char d;
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};
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// CHECK-DAG: @wpap ={{.*}} global <{ i8, i32, i8 }> <{ i8 1, i32 2, i8 3 }>
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WithPackedAndPadded wpap = {1, 2, 3};
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struct FieldOverlap {
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[[no_unique_address]] Empty1 e1, e2, e3, e4;
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int n;
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};
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static_assert(sizeof(FieldOverlap) == 4);
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// CHECK-DAG: @fo ={{.*}} global %{{[^ ]*}} { i32 1234 }
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FieldOverlap fo = {{}, {}, {}, {}, 1234};
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// CHECK-DAG: @e1 ={{.*}} constant ptr @fo
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Empty1 &e1 = fo.e1;
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// CHECK-DAG: @e2 ={{.*}} constant ptr getelementptr (i8, ptr @fo, i64 1)
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Empty1 &e2 = fo.e2;
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// CHECK-LABEL: accessE1
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// CHECK: ret ptr %{{.*}}
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Empty1 &accessE1(FieldOverlap &fo) { return fo.e1; }
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// CHECK-LABEL: accessE2
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// CHECK: %[[ADJUSTED:.*]] = getelementptr inbounds i8, ptr %{{.*}}, i64 1
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// CHECK: ret ptr %[[ADJUSTED]]
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Empty1 &accessE2(FieldOverlap &fo) { return fo.e2; }
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struct LaterDeclaredFieldHasLowerOffset {
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int a;
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int b;
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[[no_unique_address]] Empty1 e;
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};
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// CHECK-OPT-LABEL: @_Z41loadWhereLaterDeclaredFieldHasLowerOffset
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int loadWhereLaterDeclaredFieldHasLowerOffset(LaterDeclaredFieldHasLowerOffset &a) {
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// CHECK-OPT: getelementptr
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// CHECK-OPT: load {{.*}}, !tbaa ![[TBAA_AB:[0-9]*]]
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return a.b;
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}
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// Note, never emit TBAA for zero-size fields.
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// CHECK-OPT: ![[TBAA_AB]] = !{![[TBAA_A:[0-9]*]], ![[TBAA_INT:[0-9]*]], i64 4}
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// CHECK-OPT: ![[TBAA_A]] = !{!"_ZTS32LaterDeclaredFieldHasLowerOffset", ![[TBAA_INT]], i64 0, ![[TBAA_INT]], i64 4}
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struct NonTrivialInit {
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NonTrivialInit();
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};
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struct HasZeroSizedFieldWithNonTrivialInit {
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int a;
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[[no_unique_address]] NonTrivialInit b;
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};
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HasZeroSizedFieldWithNonTrivialInit testHasZeroSizedFieldWithNonTrivialInit = {.a = 1};
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// CHECK-LABEL: define {{.*}}cxx_global_var_init
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// CHECK: call {{.*}}@_ZN14NonTrivialInitC1Ev({{.*}}@testHasZeroSizedFieldWithNonTrivialInit
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