f905935ff9
When generating tbaa.struct metadata we treat multiple adjacent bitfields as a single "field", with one corresponding entry in the metadata. At the moment this is achieved by adding an entry for the first bitfield in the run using its StorageSize and skipping the remaining bitfields. The problem is that "first" is determined by checking that the Offset of the field in the run is 0, which breaks for big endian. PR: https://github.com/llvm/llvm-project/pull/87753
36 lines
1.5 KiB
C++
36 lines
1.5 KiB
C++
// RUN: %clang_cc1 -triple aarch64_be-apple-darwin -emit-llvm -o - -O1 %s | \
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// RUN: FileCheck -check-prefixes=CHECK %s
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// RUN: %clang_cc1 -triple aarch64-apple-darwin -emit-llvm -o - -O1 %s | \
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// RUN: FileCheck -check-prefixes=CHECK %s
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//
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// Check that TBAA metadata for structs containing bitfields is
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// consistent between big and little endian layouts.
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struct NamedBitfields {
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int f1 : 8;
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int f2 : 8;
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unsigned f3 : 1;
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unsigned f4 : 15;
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int f5;
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double f6;
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};
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// CHECK-LABEL: _Z4copyP14NamedBitfieldsS0_
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// CHECK-SAME: ptr nocapture noundef writeonly [[A1:%.*]], ptr nocapture noundef readonly [[A2:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) [[A1]], ptr noundef nonnull align 8 dereferenceable(16) [[A2]], i64 16, i1 false), !tbaa.struct [[TBAA_STRUCT2:![0-9]+]]
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// CHECK-NEXT: ret void
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//
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void copy(NamedBitfields *a1, NamedBitfields *a2) {
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*a1 = *a2;
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}
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// CHECK: [[TBAA_STRUCT2]] = !{i64 0, i64 4, [[META3:![0-9]+]], i64 4, i64 4, [[META6:![0-9]+]], i64 8, i64 8, [[META8:![0-9]+]]}
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// CHECK: [[META3]] = !{[[META4:![0-9]+]], [[META4]], i64 0}
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// CHECK: [[META4]] = !{!"omnipotent char", [[META5:![0-9]+]], i64 0}
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// CHECK: [[META5]] = !{!"Simple C++ TBAA"}
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// CHECK: [[META6]] = !{[[META7:![0-9]+]], [[META7]], i64 0}
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// CHECK: [[META7]] = !{!"int", [[META4]], i64 0}
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// CHECK: [[META8]] = !{[[META9:![0-9]+]], [[META9]], i64 0}
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// CHECK: [[META9]] = !{!"double", [[META4]], i64 0}
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