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