X-Git-Url: https://git.llucax.com/software/dgc/cdgc.git/blobdiff_plain/2ede6aa954704e0e386f99a6d88364f60dcf5107..6a3232d8f1c52377e792b4f4e18fd75f2a3b0f60:/rt/gc/cdgc/bits.d

diff --git a/rt/gc/cdgc/bits.d b/rt/gc/cdgc/bits.d
index 02300ce..4d25362 100644
--- a/rt/gc/cdgc/bits.d
+++ b/rt/gc/cdgc/bits.d
@@ -62,6 +62,10 @@ struct GCBits
 
     void Dtor()
     {
+        // Even when free() can be called with a null pointer, the extra call
+        // might be significant. On hard GC benchmarks making the test for null
+        // here (i.e. not making the call) can reduce the GC time by almost
+        // ~5%.
         if (data)
         {
             cstdlib.free(data);