Exit early if no work would be done to avoid crashes

Author: sterrettm2

src/xss-common-keyvaluesort.hpp

@@ -586,6 +586,9 @@ X86_SIMD_SORT_INLINE void xss_qsort_kv(
                                       half_vector<T2>,
                                       full_vector<T2>>::type;
 
+    // Exit early if no work would be done
+    if (arrsize <= 1) return;
+
 #ifdef XSS_TEST_KEYVALUE_BASE_CASE
     int maxiters = -1;
     bool minarrsize = true;
@@ -675,6 +678,9 @@ X86_SIMD_SORT_INLINE void xss_select_kv(T1 *keys,
                                       half_vector<T2>,
                                       full_vector<T2>>::type;
 
+    // Exit early if no work would be done
+    if (arrsize <= 1) return;
+
 #ifdef XSS_TEST_KEYVALUE_BASE_CASE
     int maxiters = -1;
     bool minarrsize = true;