Skip memmove in del_at_beg when not needed. (#24503)

This was likely previously done on linux in the glibc implementation. Fix #24494 (cherry picked from commit d7a171e)
JuliaLang · Nov 14, 2017 · 637280f · 637280f
1 parent 03cfcc3
commit 637280f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/array.c b/src/array.c
@@ -831,7 +831,9 @@ STATIC_INLINE void jl_array_del_at_beg(jl_array_t *a, size_t idx, size_t dec,
             nbtotal++;
         if (idx > 0)
             memmove(newdata, olddata, nb1);
-        memmove(newdata + nb1, olddata + nb1 + nbdec, nbtotal - nb1);
+        // Move the rest of the data if the offset changed
+        if (newoffs != offset)
+            memmove(newdata + nb1, olddata + nb1 + nbdec, nbtotal - nb1);
         a->data = newdata;
     }
     else {