[CIR] Improve aligned store support #1637
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This change corrects the alignment of store operations and fixes a related problem with calculation of member offsets (we weren't accounting for the alignment of the field whose offset we were calculating.
andykaylor
requested review from
xlauko,
bcardosolopes,
mmha,
erichkeane,
lanza and
FantasqueX
erichkeane
approved these changes
May 21, 2025
xlauko
reviewed
May 22, 2025
Comment on lines
897
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898
| align = mlir::IntegerAttr::get(mlir::IntegerType::get(getContext(), 64), | ||
| alignment); |
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Suggested change
| align = mlir::IntegerAttr::get(mlir::IntegerType::get(getContext(), 64), | |
| alignment); | |
| align = getI64IntegerAttr(alignment); |
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This change corrects the alignment of store operations and fixes a related problem with calculation of member offsets (we weren't accounting for the alignment of the field whose offset we were calculating.
Many tests are affected by this, but most just needed a wildcard match to ignore the explicit alignment which wasn't present before. In cases where I updated a check for a specific alignment value, I compared against classic codegen to verify that we are now producing the same alignment.
Two new tests are added align-store.c and alignment.cpp. The second of these partially copies a test of the same name from clang/test/CodeGen. It's testing globals and isn't directly related to the code changes here, but we didn't seem to have a test for this. I put the store alignment tests in a different file because inconsistency between CIR and LLVM IR in placement of globals would have made a combined test difficult to follow.
This addresses #1204