[AArch64] Pre-commit tests (NFC)

Author: AZero13

llvm/test/CodeGen/AArch64/cmp-to-cmn.ll

@@ -602,3 +602,51 @@ define i1 @almost_immediate_neg_ugt_64(i64 %x) {
   %cmp = icmp ugt i64 %x, -16773121
   ret i1 %cmp
 }
+
+define i1 @cmn_nsw(i32 %a, i32 %b) {
+; CHECK-LABEL: cmn_nsw:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    neg w8, w1
+; CHECK-NEXT:    cmp w0, w8
+; CHECK-NEXT:    cset w0, gt
+; CHECK-NEXT:    ret
+%sub = sub nsw i32 0, %b
+%cmp = icmp sgt i32 %a, %sub
+ret i1 %cmp
+}
+
+define i1 @cmn_nsw_64(i64 %a, i64 %b) {
+; CHECK-LABEL: cmn_nsw_64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    neg x8, x1
+; CHECK-NEXT:    cmp x0, x8
+; CHECK-NEXT:    cset w0, gt
+; CHECK-NEXT:    ret
+%sub = sub nsw i64 0, %b
+%cmp = icmp sgt i64 %a, %sub
+ret i1 %cmp
+}
+
+define i1 @cmn_nsw_neg(i32 %a, i32 %b) {
+; CHECK-LABEL: cmn_nsw_neg:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    neg w8, w1
+; CHECK-NEXT:    cmp w0, w8
+; CHECK-NEXT:    cset w0, gt
+; CHECK-NEXT:    ret
+%sub = sub i32 0, %b
+%cmp = icmp sgt i32 %a, %sub
+ret i1 %cmp
+}
+
+define i1 @cmn_nsw_neg_64(i64 %a, i64 %b) {
+; CHECK-LABEL: cmn_nsw_neg_64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    neg x8, x1
+; CHECK-NEXT:    cmp x0, x8
+; CHECK-NEXT:    cset w0, gt
+; CHECK-NEXT:    ret
+%sub = sub i64 0, %b
+%cmp = icmp sgt i64 %a, %sub
+ret i1 %cmp
+}