[RISCV] Add tests for fixed-length vwadd[u].{w,v}v with disjoint or. NFC

Author: lukel97

llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwadd.ll

@@ -876,3 +876,107 @@ define <2 x i64> @vwadd_v2i64_of_v2i16(ptr %x, ptr %y) {
   %e = add <2 x i64> %c, %d
   ret <2 x i64> %e
 }
+
+; %x.i32 and %y.i32 are disjoint, so DAGCombiner will combine it into an or.
+define <4 x i32> @vwaddu_vv_disjoint_or_add(<4 x i8> %x.i8, <4 x i8> %y.i8) {
+; CHECK-LABEL: vwaddu_vv_disjoint_or_add:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e16, mf2, ta, ma
+; CHECK-NEXT:    vzext.vf2 v10, v8
+; CHECK-NEXT:    vsll.vi v8, v10, 8
+; CHECK-NEXT:    vsetvli zero, zero, e32, m1, ta, ma
+; CHECK-NEXT:    vzext.vf2 v10, v8
+; CHECK-NEXT:    vzext.vf4 v8, v9
+; CHECK-NEXT:    vor.vv v8, v10, v8
+; CHECK-NEXT:    ret
+  %x.i16 = zext <4 x i8> %x.i8 to <4 x i16>
+  %x.shl = shl <4 x i16> %x.i16, splat (i16 8)
+  %x.i32 = zext <4 x i16> %x.shl to <4 x i32>
+  %y.i32 = zext <4 x i8> %y.i8 to <4 x i32>
+  %add = add <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %add
+}
+
+define <4 x i32> @vwaddu_vv_disjoint_or(<4 x i16> %x.i16, <4 x i16> %y.i16) {
+; CHECK-LABEL: vwaddu_vv_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e16, mf2, ta, ma
+; CHECK-NEXT:    vor.vv v9, v8, v9
+; CHECK-NEXT:    vsetvli zero, zero, e32, m1, ta, ma
+; CHECK-NEXT:    vzext.vf2 v8, v9
+; CHECK-NEXT:    ret
+  %x.i32 = zext <4 x i16> %x.i16 to <4 x i32>
+  %y.i32 = zext <4 x i16> %y.i16 to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}
+
+define <4 x i32> @vwadd_vv_disjoint_or(<4 x i16> %x.i16, <4 x i16> %y.i16) {
+; CHECK-LABEL: vwadd_vv_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e16, mf2, ta, ma
+; CHECK-NEXT:    vor.vv v9, v8, v9
+; CHECK-NEXT:    vsetvli zero, zero, e32, m1, ta, ma
+; CHECK-NEXT:    vsext.vf2 v8, v9
+; CHECK-NEXT:    ret
+  %x.i32 = sext <4 x i16> %x.i16 to <4 x i32>
+  %y.i32 = sext <4 x i16> %y.i16 to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}
+
+define <4 x i32> @vwaddu_vx_disjoint_or(<4 x i16> %x.i16, i16 %y.i16) {
+; CHECK-LABEL: vwaddu_vx_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e16, mf2, ta, ma
+; CHECK-NEXT:    vor.vx v9, v8, a0
+; CHECK-NEXT:    vsetvli zero, zero, e32, m1, ta, ma
+; CHECK-NEXT:    vzext.vf2 v8, v9
+; CHECK-NEXT:    ret
+  %x.i32 = zext <4 x i16> %x.i16 to <4 x i32>
+  %y.head = insertelement <4 x i16> poison, i16 %y.i16, i32 0
+  %y.splat = shufflevector <4 x i16> %y.head, <4 x i16> poison, <4 x i32> zeroinitializer
+  %y.i32 = zext <4 x i16> %y.splat to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}
+
+define <4 x i32> @vwadd_vx_disjoint_or(<4 x i16> %x.i16, i16 %y.i16) {
+; CHECK-LABEL: vwadd_vx_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e16, mf2, ta, ma
+; CHECK-NEXT:    vor.vx v9, v8, a0
+; CHECK-NEXT:    vsetvli zero, zero, e32, m1, ta, ma
+; CHECK-NEXT:    vsext.vf2 v8, v9
+; CHECK-NEXT:    ret
+  %x.i32 = sext <4 x i16> %x.i16 to <4 x i32>
+  %y.head = insertelement <4 x i16> poison, i16 %y.i16, i32 0
+  %y.splat = shufflevector <4 x i16> %y.head, <4 x i16> poison, <4 x i32> zeroinitializer
+  %y.i32 = sext <4 x i16> %y.splat to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}
+
+define <4 x i32> @vwaddu_wv_disjoint_or(<4 x i32> %x.i32, <4 x i16> %y.i16) {
+; CHECK-LABEL: vwaddu_wv_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e32, m1, ta, ma
+; CHECK-NEXT:    vzext.vf2 v10, v9
+; CHECK-NEXT:    vor.vv v8, v8, v10
+; CHECK-NEXT:    ret
+  %y.i32 = zext <4 x i16> %y.i16 to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}
+
+define <4 x i32> @vwadd_wv_disjoint_or(<4 x i32> %x.i32, <4 x i16> %y.i16) {
+; CHECK-LABEL: vwadd_wv_disjoint_or:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetivli zero, 4, e32, m1, ta, ma
+; CHECK-NEXT:    vsext.vf2 v10, v9
+; CHECK-NEXT:    vor.vv v8, v8, v10
+; CHECK-NEXT:    ret
+  %y.i32 = sext <4 x i16> %y.i16 to <4 x i32>
+  %or = or disjoint <4 x i32> %x.i32, %y.i32
+  ret <4 x i32> %or
+}