[libc++][test] std/containers/views/mdspan/mdspan/conversion.pass.cpp Fails on PowerPC targets #64427
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amy-kwan
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@llvm/issue-subscribers-backend-powerpc |
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@crtrott Just wanted to let you know that I have discovered this when testing libc++. |
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This looks suspiciously simmilar to the MinGW issue reported by me #64077. I will have a look. |
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We should try the godbolt example seen in #64077 on PowerPC and check whether it has the same issue there. |
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I confirmed that the godbolt example https://godbolt.org/z/KK8aj5bs7 (minus the concept and span include which isn't needed) fails on PowerPC with Clang 14 too. No extra options needed just |
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https://reviews.llvm.org/D157332 has got a potential fix for this issue. |
EugeneZelenko
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I can confirm that https://reviews.llvm.org/D157332 resolves the issue. |
mstorsjo
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Aug 15, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes #64253, and possibly #64077 and #64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
llvmbot
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Aug 15, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm/llvm-project#64253, and possibly llvm/llvm-project#64077 and llvm/llvm-project#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332 (cherry picked from commit d60c3d0)
tru
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Aug 16, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm/llvm-project#64253, and possibly llvm/llvm-project#64077 and llvm/llvm-project#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332 (cherry picked from commit d60c3d0)
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Can this be closed now? I see linked commits to this issue. |
Yes, some version of the fix was confirmed as fixing this issue, and as the final forms of the fix, in 4d502f1, did essentially the same thing, I think we can close it, and reopen if it (unlikely) turns out to not be fixed after all. |
razmser
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Oct 2, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 2, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 2, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 3, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 3, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 6, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
razmser
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Oct 11, 2023
An empty struct is handled as a struct with a dummy i8, on all targets. Most targets treat an empty struct return value as essentially void - but some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't treat it as void.) When intializing a struct with such a no_unique_address member, make sure we don't write the dummy i8 into the struct where there's no space allocated for it. Previously it would clobber the actual valid data of the struct. Fixes llvm#64253, and possibly llvm#64077 and llvm#64427 as well. We should omit the store for any empty record (not only ones declared with no_unique_address); we can have a situation where a class doesn't have the no_unique_address attribute, but is embedded in an outer struct with the no_unique_address attribute - like this: struct S {}; S f(); struct S2 : public S { S2();}; S2::S2() : S(f()) {} struct S3 { int x; [[no_unique_address]] S2 y; S3(); }; S3::S3() : x(1), y() {} Here, the problematic store (which this patch omits) is in the constructor of S2. In the case of S3, S2 has no valid storage and aliases x - thus the constructor of S2 should omit the dummy store. Differential Revision: https://reviews.llvm.org/D157332
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This test was introduced in https://reviews.llvm.org/D154367.
Assertion seen:
This issue occurs on both LLVM 17.0.0 rc1 and
main.The text was updated successfully, but these errors were encountered: