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[CIR][ThroughMLIR] Lower structs and GetMemberOp. #1943

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[CIR][ThroughMLIR] Lower structs and GetMemberOp. #1943

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The PR1565 contains too many conflicts with the main branch.

Got it re-patched to the current main branch.

Structs are implemented as memref. It is not feasible to represent them as tuples,
for tuples can't be put in memref (i.e. pointers to structs would break if we did).

We use memref::ViewOp for this. Unlike PtrStrideOp, the reinterpret cast operation doesn't work here,
as the result type is potentially different from i8.

@bcardosolopes bcardosolopes mentioned this pull request Oct 10, 2025
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bcardosolopes approved these changes Oct 10, 2025
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LGTM, pending minor nits

clang/lib/CIR/Dialect/IR/CIRTypes.cpp
assert(idx < getNumElements());
auto members = getMembers();

// unsigned offset = 0, recordSize = 0;
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Please remove all commented code snippets

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and also pending tests passing :)

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@bcardosolopes bcardosolopes bcardosolopes approved these changes

@lanza lanza Awaiting requested review from lanza lanza is a code owner

@xlauko xlauko Awaiting requested review from xlauko xlauko is a code owner

@andykaylor andykaylor Awaiting requested review from andykaylor andykaylor is a code owner

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