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# c4d256a5 14-Oct-2019 Alexander Timofeev <[email protected]>

[AMDGPU] Come back patch for the 'Assign register class for cross block values according to the divergence.'

Detailed description:

After https://reviews.llvm.org/D59990 submit several issues

[AMDGPU] Come back patch for the 'Assign register class for cross block values according to the divergence.'

Detailed description:

After https://reviews.llvm.org/D59990 submit several issues were discovered.
Changes in common code were preserved but AMDGPU specific part was reverted to keep the backend working correctly.

Discovered issues were addressed in the following commits:

https://reviews.llvm.org/D67662
https://reviews.llvm.org/D67101
https://reviews.llvm.org/D63953
https://reviews.llvm.org/D63731

This change brings back AMDGPU specific changes.

Reviewed by: rampitec, arsenm

Differential Revision: https://reviews.llvm.org/D68635

llvm-svn: 374767

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Revision tags: llvmorg-9.0.0, llvmorg-9.0.0-rc6, llvmorg-9.0.0-rc5, llvmorg-9.0.0-rc4, llvmorg-9.0.0-rc3, llvmorg-9.0.0-rc2, llvmorg-9.0.0-rc1
# 1022c0df 19-Jul-2019 Matt Arsenault <[email protected]>

AMDGPU: Decompose all values to 32-bit pieces for calling conventions

This is the more natural lowering, and presents more opportunities to
reduce 64-bit ops to 32-bit.

This should also help avoid

AMDGPU: Decompose all values to 32-bit pieces for calling conventions

This is the more natural lowering, and presents more opportunities to
reduce 64-bit ops to 32-bit.

This should also help avoid issues graphics shaders have had with
64-bit values, and simplify argument lowering in globalisel.

llvm-svn: 366578

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Revision tags: llvmorg-10-init, llvmorg-8.0.1, llvmorg-8.0.1-rc4, llvmorg-8.0.1-rc3, llvmorg-8.0.1-rc2
# 9c70c574 27-May-2019 Michael Liao <[email protected]>

[SelectionDAG] Enhance the simplification of `copyto` from `implicit-def`.

Summary:
- The current implementation simplifies the case where the source of
`copyto` is `implicit-def`ed. However, it o

[SelectionDAG] Enhance the simplification of `copyto` from `implicit-def`.

Summary:
- The current implementation simplifies the case where the source of
`copyto` is `implicit-def`ed. However, it only works when that
`implicit-def` is single-used since it detects that from
`implicit-def` and cannot determine which destination vreg should be
used if there are multiple uses.
- This patch changes that detection when `copyto` is being emitted. If
that `copyto`'s source is defined from `implicit-def`, it simplifies
it. Hence, it works even that `implicit-def` is multi-used.
- Except it simplifies the internal IR, it won't improve the quality of
code generation. However, it helps to detect 'implicit-def` in a
straight-forward manner in some passes, such as `si-i1-copies`. A test
case is added.

Reviewers: sunfish, nhaehnle

Subscribers: jvesely, hiraditya, asbirlea, llvm-commits, yaxunl

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62342

llvm-svn: 361777

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