| Issue |
177448
|
| Summary |
getNegatedExpression should handle FP16_TO_FP and FP_TO_FP16
|
| Labels |
missed-optimization,
floating-point,
llvm:SelectionDAG
|
| Assignees |
|
| Reporter |
arsenm
|
[getNegatedExpression](https://github.com/llvm/llvm-project/blob/e89a99e26db168f99e928f6a82cab0df13a77c96/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp#L7556) does not handle the opcodes FP16_TO_FP and FP_TO_FP16, but it could. This could improve use of source modifiers on AMDGPU with illegal f16.
I started implementing it in this patch, but it requires additional work to avoid regressions.
[0001-DAG-Implement-getNegatedExpression-for-FP16_TO_FP.patch](https://github.com/user-attachments/files/24806027/0001-DAG-Implement-getNegatedExpression-for-FP16_TO_FP.patch)
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