[all-commits] [llvm/llvm-project] 283806: [GlobalIsel] Add combine for select with constants...

[Vikash Gupta via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 283806695a6deeacd5d3eaf88becec2b627ab56f
      https://github.com/llvm/llvm-project/commit/283806695a6deeacd5d3eaf88becec2b627ab56f
  Author: Vikash Gupta <Vikash.Gupta at amd.com>
  Date:   2025-01-01 (Wed, 01 Jan 2025)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir

  Log Message:
  -----------
  [GlobalIsel] Add combine for select with constants (#121088)

The SelectionDAG Isel supports the both version of combines mentioned
below :
```
select Cond, Pow2, 0 --> (zext Cond)  << log2(Pow2) 
select Cond, 0, Pow2 --> (zext !Cond) << log2(Pow2)
```
The GlobalIsel for now only supports the first one defined in it's
generic combinerHelper.cpp. This patch adds the missing second one.



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