Inlined newSV_type(SVt_NULL) leaner than non-inlined newSV(0)

When a function outside of sv.c creates a SV via newSV(0):
 * There is a call to Perl_newSV
 * A SV head is uprooted and its flags set
 * A runtime check is made to effectively see if 0 > 0
 * The new SV* is returned

Replacing newSV(0) with newSV_type(SVt_NULL) should be more efficient,
because (assuming there are SV heads to uproot), the only step is:
 * A SV head is uprooted and its flags set

1 files changed, 1 insertions, 1 deletions

diff --git a/inline.h b/inline.h
index c5f0ee69b3..2bf98d815d 100644
--- a/inline.h
+++ b/inline.h
@@ -134,7 +134,7 @@ Perl_av_fetch_simple(pTHX_ AV *av, SSize_t key, I32 lval)
     assert(key > -1);
 
     if ( (key > AvFILLp(av)) || !AvARRAY(av)[key]) {
-        return lval ? av_store_simple(av,key,newSV(0)) : NULL;
+        return lval ? av_store_simple(av,key,newSV_type(SVt_NULL)) : NULL;
     } else {
         return &AvARRAY(av)[key];
     }