compiler: prefill the native array with the literal string parts

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/compiler/abstract_compiler.nit b/src/compiler/abstract_compiler.nit
index dfaa3a3..658f0e7 100644 (file)
--- a/src/compiler/abstract_compiler.nit
+++ b/src/compiler/abstract_compiler.nit
@@ -2796,6 +2796,16 @@ redef class ASuperstringExpr
                var a = v.native_array_instance(type_string, v.int_instance(array.length))
 
                v.add_decl("static {a.mtype.ctype} {varonce};")
+
+               # Pre-fill the array with the literal string parts.
+               # So they do not need to be filled again when reused
+               for i in [0..array.length[ do
+                       var ne = array[i]
+                       if not ne isa AStringFormExpr then continue
+                       var e = v.expr(ne, null)
+                       v.native_array_set(a, i, e)
+               end
+
                v.add("\} else \{")
                # Take the native-array from the store.
                # The point is to prevent that some recursive execution use (and corrupt) the same native array
@@ -2808,6 +2818,7 @@ redef class ASuperstringExpr
                var to_s_method = v.get_property("to_s", v.object_type)
                for i in [0..array.length[ do
                        var ne = array[i]
+                       if ne isa AStringFormExpr then continue
                        var e = v.expr(ne, null)
                        # Skip the `to_s` if the element is already a String
                        if not e.mcasttype.is_subtype(v.compiler.mainmodule, null, type_string) then