[opt] Infer DataLayout from triple if not specified

There are many tests that specify a target triple/CPU flags but no
DataLayout which can lead to IR being generated that has unusual
behaviour. Thi

[opt] Infer DataLayout from triple if not specified

There are many tests that specify a target triple/CPU flags but no
DataLayout which can lead to IR being generated that has unusual
behaviour. This commit attempts to use the default DataLayout based
on the relevant flags if there is no explicit override on the command
line or in the IR file.

One thing that is not currently possible to differentiate from a missing
datalayout `target datalayout = ""` in the IR file since the current
APIs don't allow detecting this case. If it is considered useful to
support this case (instead of passing "-data-layout=" on the command
line), I can change IR parsers to track whether they have seen such a
directive and change the callback type.

Differential Revision: https://reviews.llvm.org/D141060

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Auto-generate test checks for tests affected by D141060

These files had manual CHECK lines which make the diff from D141060
very difficult to review.

AMDGPU: Use poison instead of undef in module lds pass

[AMDGPU] Convert some tests to opaque pointers (NFC)

AMDGPU: Update test

[amdgpu] Reimplement LDS lowering

Renames the current lowering scheme to "module" and introduces two new
ones, "kernel" and "table", plus a "hybrid" that chooses between those three
on a per-variabl

[amdgpu] Reimplement LDS lowering

Renames the current lowering scheme to "module" and introduces two new
ones, "kernel" and "table", plus a "hybrid" that chooses between those three
on a per-variable basis.

Unit tests are set up to pass with the default lowering of "module" or "hybrid"
with this patch defaulting to "module", which will be a less dramatic codegen
change relative to the current. This reflects the sparsity of test coverage for
the table lowering method. Hybrid is better than module in every respect and
will be default in a subsequent patch.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D139433

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Revert "[amdgpu] Reimplement LDS lowering"

This reverts commit 982017240d7f25a8a6969b8b73dc51f9ac5b93ed.
Breaks check-llvm, see https://reviews.llvm.org/D139433#3974862

[amdgpu] Reimplement LDS lowering

Renames the current lowering scheme to "module" and introduces two new
ones, "kernel" and "table", plus a "hybrid" that chooses between those three
on a per-variabl

[amdgpu] Reimplement LDS lowering

Renames the current lowering scheme to "module" and introduces two new
ones, "kernel" and "table", plus a "hybrid" that chooses between those three
on a per-variable basis.

Unit tests are set up to pass with the default lowering of "module" or "hybrid"
with this patch defaulting to "module", which will be a less dramatic codegen
change relative to the current. This reflects the sparsity of test coverage for
the table lowering method. Hybrid is better than module in every respect and
will be default in a subsequent patch.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D139433

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[AMDGPU] Propagate LDS align into to instructions

Differential Revision: https://reviews.llvm.org/D104316

[AMDGPU] Fix module LDS selection

Accesses to global module LDS variable start from null,
but kernel also thinks its variables start address is
null. Fixed by not using a null as an address.

Differ

[AMDGPU] Fix module LDS selection

Accesses to global module LDS variable start from null,
but kernel also thinks its variables start address is
null. Fixed by not using a null as an address.

Differential Revision: https://reviews.llvm.org/D102882

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[amdgpu] Implement lower function LDS pass

[amdgpu] Implement lower function LDS pass

Local variables are allocated at kernel launch. This pass collects global
variables that are used from non-kern

[amdgpu] Implement lower function LDS pass

[amdgpu] Implement lower function LDS pass

Local variables are allocated at kernel launch. This pass collects global
variables that are used from non-kernel functions, moves them into a new struct
type, and allocates an instance of that type in every kernel. Uses are then
replaced with a constantexpr offset.

Prior to this pass, accesses from a function are compiled to trap. With this
pass, most such accesses are removed before reaching codegen. The trap logic
is left unchanged by this pass. It is still reachable for the cases this pass
misses, notably the extern shared construct from hip and variables marked
constant which survive the optimizer.

This is of interest to the openmp project because the deviceRTL runtime library
uses cuda shared variables from functions that cannot be inlined. Trunk llvm
therefore cannot compile some openmp kernels for amdgpu. In addition to the
unit tests attached, this patch applied to ROCm llvm with fixed-abi enabled
and the function pointer hashing scheme deleted passes the openmp suite.

This lowering will use more LDS than strictly necessary. It is intended to be
a functionally correct fallback for cases that are difficult to target from
future optimisation passes.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D94648

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