[llvm] [X86][GlobalIsel] Support G_IS_FPCLASS (PR #162232)
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Tue Oct 7 02:14:46 PDT 2025
mahesh-attarde wrote:
> Current generic lowering differs from SDAG in two ways.
>
> 1. X86 DAG uses signed comparisons where as X86 Generic GISEL adds unsigned compares.
> 2. Sequence like `xor ecx ecx; or cl, al` is not combined in GISEL.
Missing Optimization issue https://github.com/llvm/llvm-project/issues/162248
https://github.com/llvm/llvm-project/pull/162232
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