[all-commits] [llvm/llvm-project] 3e3b23: [mlir][memref] Fix alloca lowering with 0 dimensions

[Matthias Springer via All-commits]

  Branch: refs/heads/users/matthias-springer/alloca_zero
  Home:   https://github.com/llvm/llvm-project
  Commit: 3e3b23f6b4bcfa1a30a2a5a2acc4b73868829720
      https://github.com/llvm/llvm-project/commit/3e3b23f6b4bcfa1a30a2a5a2acc4b73868829720
  Author: Matthias Springer <mspringer at nvidia.com>
  Date:   2024-10-04 (Fri, 04 Oct 2024)

  Changed paths:
    M mlir/lib/Conversion/LLVMCommon/Pattern.cpp
    M mlir/test/Conversion/MemRefToLLVM/convert-static-memref-ops.mlir

  Log Message:
  -----------
  [mlir][memref] Fix alloca lowering with 0 dimensions

The `memref.alloca` lowering computed the allocation size incorrectly when there were 0 dimensions.

Previously:
```
memref.alloca() : memref<10x0x2xf32>
--> llvm.alloca 20xf32
```

Now:
```
memref.alloca() : memref<10x0x2xf32>
--> llvm.alloca 0xf32
```

>From the `llvm.alloca` documentation:
```
Allocating zero bytes is legal, but the returned pointer may not be unique.
```



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