commit 6dbc9c045741c27435b9b23246c2113221b26c2f Author: Andreas Arnez Date: Mon Apr 27 11:38:46 2015 +0200 S390: For zero, let is_power_of_two() return false This fixes a minor issue with the helper function is_power_of_two(), which returned non-zero ("true") if the argument was zero. This led to a wrong decision when passing a zero-sized struct in an inferior function call. gdb/ChangeLog: * s390-linux-tdep.c (is_power_of_two): Add comment. Return false if the argument is zero. ### a/gdb/ChangeLog ### b/gdb/ChangeLog ## -1,3 +1,8 @@ +2015-04-27 Andreas Arnez + + * s390-linux-tdep.c (is_power_of_two): Add comment. Return + false if the argument is zero. + 2015-04-27 Pierre-Marie de Rodat * ada-lang.c (template_to_static_fixed_type): Return input type Index: gdb-7.6.1/gdb/s390-tdep.c =================================================================== --- gdb-7.6.1.orig/gdb/s390-tdep.c 2016-02-21 22:13:34.600107988 +0100 +++ gdb-7.6.1/gdb/s390-tdep.c 2016-02-21 22:14:09.318523194 +0100 @@ -2641,11 +2641,12 @@ || is_float_singleton (type)); } +/* Determine whether N is a power of two. */ static int is_power_of_two (ULONGEST n) { - return ((n & (n - 1)) == 0); + return n && ((n & (n - 1)) == 0); } /* Return non-zero if TYPE should be passed as a pointer to a copy,