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clang 10.0.0_rc1 standalone fails to build with polly #58

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@tstellar tstellar commented Apr 9, 2020

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tstellar commented Apr 9, 2020

cherry-pick: d21664c

@llvmbot
Fix integration of pass plugins with llvm dylib
2f0fa80 
Call llvm_process_pass_plugin from clang when in standalone mode.

Differential Revision: https://reviews.llvm.org/D74464

(cherry picked from commit d21664c)
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branch: issue-58-pr

@tstellar tstellar closed this Feb 17, 2021
tstellar pushed a commit that referenced this pull request Aug 27, 2024
@ParkHanbum
[AArch64] Replace AND with LSL#2 for LDR target (llvm#34101) (llvm#89531
77fccb3 
)

Currently, process of replacing bitwise operations consisting of
`LSR`/`LSL` with `And` is performed by `DAGCombiner`.

However, in certain cases, the `AND` generated by this process
can be removed.

Consider following case:
```
        lsr x8, x8, #56
        and x8, x8, #0xfc
        ldr w0, [x2, x8]
        ret
```

In this case, we can remove the `AND` by changing the target of `LDR`
to `[X2, X8, LSL #2]` and right-shifting amount change to 56 to 58.

after changed:
```
        lsr x8, x8, #58
        ldr w0, [x2, x8, lsl #2]
        ret
```

This patch checks to see if the `SHIFTING` + `AND` operation on load
target can be optimized and optimizes it if it can.
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