[RISCV] remove VPatTruncSatClipMaxMin for unsigned saturating truncation

Author: sun-jacobi

llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td

@@ -2381,15 +2381,11 @@ multiclass VPatTruncSatClipMaxMin<string inst, VTypeInfo vti, VTypeInfo wti,
 multiclass VPatTruncSatClip<VTypeInfo vti, VTypeInfo wti> {
   defvar sew = vti.SEW;
   defvar uminval = !sub(!shl(1, sew), 1);
-  defvar umaxval = 0;
   defvar sminval = !sub(!shl(1, !sub(sew, 1)), 1);
   defvar smaxval = !sub(0, !shl(1, !sub(sew, 1)));
 
-  defm : VPatTruncSatClipMaxMin<"PseudoVNCLIPU", vti, wti, riscv_umax_vl,
-                                umaxval, riscv_umin_vl, uminval>;
   defm : VPatTruncSatClipMaxMin<"PseudoVNCLIP", vti, wti, riscv_smin_vl,
                                 sminval, riscv_smax_vl, smaxval>;
-
   defm : VPatTruncSatClipUMin<vti, wti, uminval>;
 }