lib/core: Improve FlatBuffer re-allocation rate by pre-allocating at least 16 bytes

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

diff --git a/lib/core/text/flat.nit b/lib/core/text/flat.nit
index 0fc5663..2533323 100644 (file)
--- a/lib/core/text/flat.nit
+++ b/lib/core/text/flat.nit
@@ -933,12 +933,13 @@ class FlatBuffer
        do
                var c = capacity
                if cap <= c then return
-               while c <= cap do c = c * 2 + 2
+               if c <= 16 then c = 16
+               while c <= cap do c = c * 2
                # The COW flag can be set at false here, since
                # it does a copy of the current `Buffer`
                written = false
                var bln = _bytelen
-               var a = new NativeString(c+1)
+               var a = new NativeString(c)
                if bln > 0 then
                        var it = _items
                        if bln > 0 then it.copy_to(a, bln, 0, 0)