[llvm] [DAG][RISCV] Use vp_reduce_fadd/fmul when widening types for FP reductions (PR #105840)

[Philip Reames via llvm-commits]

================
@@ -722,27 +722,29 @@ HELPER_REGISTER_REDUCTION_VP(vp_reduce_fminimum, VP_REDUCE_FMINIMUM,
 #error                                                                         \
     "The internal helper macro HELPER_REGISTER_REDUCTION_SEQ_VP is already defined!"
 #endif
-#define HELPER_REGISTER_REDUCTION_SEQ_VP(VPID, VPSD, SEQ_VPSD, INTRIN)         \
+#define HELPER_REGISTER_REDUCTION_SEQ_VP(VPID, VPSD, SEQ_VPSD, SDOPC, SEQ_SDOPC, INTRIN) \
   BEGIN_REGISTER_VP_INTRINSIC(VPID, 2, 3)                                      \
   BEGIN_REGISTER_VP_SDNODE(VPSD, 1, VPID, 2, 3)                                \
   VP_PROPERTY_REDUCTION(0, 1)                                                  \
+  VP_PROPERTY_FUNCTIONAL_SDOPC(SDOPC)                                          \
   END_REGISTER_VP_SDNODE(VPSD)                                                 \
   BEGIN_REGISTER_VP_SDNODE(SEQ_VPSD, 1, VPID, 2, 3)                            \
   HELPER_MAP_VPID_TO_VPSD(VPID, SEQ_VPSD)                                      \
+  VP_PROPERTY_FUNCTIONAL_SDOPC(SEQ_SDOPC)                                      \
----------------
preames wrote:

That property is only used in checking whether the vp operation has a functional *IR level* representation marked.  It doesn't apply to the SDNode representation at all.  

https://github.com/llvm/llvm-project/pull/105840