llvm-project.git/llvm/test/CodeGen/SystemZ/scmp.ll, branch users/nico/python-2 Unnamed repository; edit this file 'description' to name the repository. [SelectionDAG] Expand [US]CMP using arithmetic on boolean values instead of selects (#98774) 2024-07-16T19:56:18+00:00 Volodymyr Vasylkun vvmposeydon@gmail.com 2024-07-16T19:56:18+00:00 e094abde42634e38cda85a6024792f681fc58f32 The previous expansion of [US]CMP was done using two selects and two compares. It produced decent code, but on many platforms it is better to implement [US]CMP nodes by performing the following operation: ``` [us]cmp(x, y) = (x [us]> y) - (x [us]< y) ``` This patch adds this new expansion, as well as a hook in TargetLowering to allow some targets to still use the select-based approach. AArch64 and SystemZ are currently the only targets to prefer the former approach, but other targets may also start to use it if it provides for better codegen. 
The previous expansion of [US]CMP was done using two selects and two
compares. It produced decent code, but on many platforms it is better to
implement [US]CMP nodes by performing the following operation:

  ```
[us]cmp(x, y) = (x [us]> y) - (x [us]< y)
```

This patch adds this new expansion, as well as a hook in TargetLowering to allow some targets to still use the select-based approach. AArch64 and SystemZ are currently the only targets to prefer the former approach, but other targets may also start to use it if it provides for better codegen.