commit 6dbc9c045741c27435b9b23246c2113221b26c2f
Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
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 <arnez@linux.vnet.ibm.com>
+
+ * s390-linux-tdep.c (is_power_of_two): Add comment. Return
+ false if the argument is zero.
+
2015-04-27 Pierre-Marie de Rodat <derodat@adacore.com>
* 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,