[llvm] PowerPC/VSX: Select FMINNUM_IEEE and FMAXNUM_IEEE (PR #112195)

[YunQiang Su via llvm-commits]

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@@ -775,6 +775,10 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
     setOperationAction(ISD::FMAXNUM_IEEE, MVT::f32, Legal);
     setOperationAction(ISD::FMINNUM_IEEE, MVT::f64, Legal);
     setOperationAction(ISD::FMINNUM_IEEE, MVT::f32, Legal);
+    setOperationAction(ISD::FMAXNUM, MVT::f64, Legal);
+    setOperationAction(ISD::FMAXNUM, MVT::f32, Legal);
+    setOperationAction(ISD::FMINNUM, MVT::f64, Legal);
+    setOperationAction(ISD::FMINNUM, MVT::f32, Legal);
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wzssyqa wrote:

So my plan to break this bootstrap problem is:
1. mark `Legal` to ISD::FMINNUM  for PowerPC/VSX.
   add FMINNUM_IEEE to PowerPC/VSX.
3. add `FCANONICALIZE` support to PowerPC/VSX.
4. Fix expandFMINNUMFMAXNUM to drop `FCANONICALIZE` if `FMINNUM_IEEE` is available.
5. Add test cases of `fmininumnum` to PowerPC/VSX.

https://github.com/llvm/llvm-project/pull/112195