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rearrange struct value to save memory

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This patch rearranges struct value a tiny bit, moving the "regnum"
field into a hole.  This saves 8 bytes per value on a 64-bit machine,
and 4 bytes per value on a 32 bit machine.  I think it does not
negatively affect readability or performance.

Built and regtested on x86-64 Fedora 18.

2014-01-16  Tom Tromey  <tromey@redhat.com>

	* value.c (struct value) <regnum>: Move earlier.
This commit is contained in:
Tom Tromey 2013-12-27 22:22:07 -07:00
parent 77a1944595
commit 98b1cfdcc8
2 changed files with 7 additions and 3 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2014-01-16 Tom Tromey <tromey@redhat.com>
* value.c (struct value) <regnum>: Move earlier.
2014-01-16 Tom Tromey <tromey@redhat.com>
* remote.c (extended_remote_create_inferior): Rename from

6
gdb/value.c
View File

@ -216,6 +216,9 @@ struct value
/* If the value has been released. */
unsigned int released : 1;
/* Register number if the value is from a register. */
short regnum;
/* Location of value (if lval). */
union
{
@ -324,9 +327,6 @@ struct value
taken off this list. */
struct value *next;
/* Register number if the value is from a register. */
short regnum;
/* Actual contents of the value. Target byte-order. NULL or not
valid if lazy is nonzero. */
gdb_byte *contents;