I committed the change below updating and completing the description
of the native_encode_expr function.
Martin
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 9fc4c2a06fb..7c4d1eff215 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7875,11 +7875,12 @@ native_encode_string (const_tree expr, unsigned
char *ptr, int len, int off)
}
-/* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST,
- REAL_CST, COMPLEX_CST or VECTOR_CST specified by EXPR into the
- buffer PTR of length LEN bytes. If PTR is NULL, don't actually store
- anything, just do a dry run. If OFF is not -1 then start
- the encoding at byte offset OFF and encode at most LEN bytes.
+/* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST, REAL_CST,
+ FIXED_CST, COMPLEX_CST, STRING_CST, or VECTOR_CST specified by EXPR into
+ the buffer PTR of size LEN bytes. If PTR is NULL, don't actually store
+ anything, just do a dry run. Fail either if OFF is -1 and LEN isn't
+ sufficient to encode the entire EXPR, or if OFF is out of bounds.
+ Otherwise, start at byte offset OFF and encode at most LEN bytes.
Return the number of bytes placed in the buffer, or zero upon
failure. */
int
