[RISCV] Fix copy/paste mistake in Sh3Add_UWPat.

This pattern appears to be a copy of the pattern in Sh3AddPat
but using sh3add.uw instead of sh3add. I think this is mistake and
the pattern should be the equivalent of the first pattern from
Sh1Add_UWPat and Sh2Add_UWPat.

These classes were created to share with Andes in a788a1a, but
there was so many test changes in there that we must have overlooked the
changes to Zba codegen.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoZb.td

@@ -808,9 +808,9 @@ multiclass Sh2Add_UWPat<Instruction sh2add_uw> {
 }
 
 multiclass Sh3Add_UWPat<Instruction sh3add_uw> {
-  def : Pat<(i64 (add_like_non_imm12 (and GPR:$rs1, 0xFFFFFFF8),
+  def : Pat<(i64 (add_like_non_imm12 (and (shl GPR:$rs1, (i64 3)), 0x7FFFFFFFF),
                                      (XLenVT GPR:$rs2))),
-            (sh3add_uw (XLenVT (SRLIW GPR:$rs1, 3)), GPR:$rs2)>;
+            (sh3add_uw GPR:$rs1, GPR:$rs2)>;
   // Use SRLI to clear the LSBs and SHXADD_UW to mask and shift.
   def : Pat<(i64 (add_like_non_imm12 (and GPR:$rs1, 0x7FFFFFFF8),
                                      (XLenVT GPR:$rs2))),

llvm/test/CodeGen/RISCV/rv64zba.ll

@@ -409,15 +409,11 @@ define i64 @sh3adduw_2(i64 %0, i64 %1) {
 ;
 ; RV64ZBA-LABEL: sh3adduw_2:
 ; RV64ZBA:       # %bb.0:
-; RV64ZBA-NEXT:    slli a0, a0, 3
-; RV64ZBA-NEXT:    srli a0, a0, 3
 ; RV64ZBA-NEXT:    sh3add.uw a0, a0, a1
 ; RV64ZBA-NEXT:    ret
 ;
 ; RV64XANDESPERF-LABEL: sh3adduw_2:
 ; RV64XANDESPERF:       # %bb.0:
-; RV64XANDESPERF-NEXT:    slli a0, a0, 3
-; RV64XANDESPERF-NEXT:    srli a0, a0, 3
 ; RV64XANDESPERF-NEXT:    nds.lea.d.ze a0, a1, a0
 ; RV64XANDESPERF-NEXT:    ret
   %3 = shl i64 %0, 3
@@ -436,15 +432,11 @@ define i64 @sh3adduw_3(i64 %0, i64 %1) {
 ;
 ; RV64ZBA-LABEL: sh3adduw_3:
 ; RV64ZBA:       # %bb.0:
-; RV64ZBA-NEXT:    slli a0, a0, 3
-; RV64ZBA-NEXT:    srli a0, a0, 3
 ; RV64ZBA-NEXT:    sh3add.uw a0, a0, a1
 ; RV64ZBA-NEXT:    ret
 ;
 ; RV64XANDESPERF-LABEL: sh3adduw_3:
 ; RV64XANDESPERF:       # %bb.0:
-; RV64XANDESPERF-NEXT:    slli a0, a0, 3
-; RV64XANDESPERF-NEXT:    srli a0, a0, 3
 ; RV64XANDESPERF-NEXT:    nds.lea.d.ze a0, a1, a0
 ; RV64XANDESPERF-NEXT:    ret
   %3 = shl i64 %0, 3
@@ -2681,7 +2673,7 @@ define i64 @srliw_3_sh3add(ptr %0, i32 signext %1) {
 ; RV64ZBA-LABEL: srliw_3_sh3add:
 ; RV64ZBA:       # %bb.0:
 ; RV64ZBA-NEXT:    srliw a1, a1, 3
-; RV64ZBA-NEXT:    sh3add.uw a0, a1, a0
+; RV64ZBA-NEXT:    sh3add a0, a1, a0
 ; RV64ZBA-NEXT:    ld a0, 0(a0)
 ; RV64ZBA-NEXT:    ret
 ;