[llvm] [RISCV] Make fixed-point instructions commutable (PR #90035)

[Luke Lau via llvm-commits]

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@@ -2718,7 +2720,7 @@ multiclass VPseudoVGTR_VV_VX_VI<Operand ImmType = simm5, string Constraint = "">
 multiclass VPseudoVSALU_VV_VX_VI<Operand ImmType = simm5, string Constraint = ""> {
   foreach m = MxList in {
     defvar mx = m.MX;
-    defm "" : VPseudoBinaryV_VV<m, Constraint>,
+    defm "" : VPseudoBinaryV_VV<m, Constraint, Commutable=1>,
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lukel97 wrote:

Maybe add a Commutable argument to VPseudoVSALU_VV_VX_VI and explicitly set it in the PseudoVSADD[U] defms? So it's more obvious that only the add pseudos are commutable

https://github.com/llvm/llvm-project/pull/90035