[llvm] [X86][NVPTX][LegalizeDAG] If i16 legal, legalize FABS.f16 with Expand (PR #106153)

[Artem Belevich via llvm-commits]

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@@ -672,6 +672,11 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
 
     // Half type will be promoted by default.
     setF16Action(MVT::f16, Promote);
+    // Expand instead of Promote to clear/flip/copy sign bit by bitcasting to
+    // i16.
+    setOperationAction(ISD::FABS, MVT::f16, Expand);
+    setOperationAction(ISD::FNEG, MVT::f16, Expand);
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Artem-B wrote:

X86 could use test cases for fneg/fcopysign.

https://github.com/llvm/llvm-project/pull/106153