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From: jamal <hadi-fAAogVwAN2Kw5LPnMra/2Q@public.gmane.org>
To: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: dwarves-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Changing the word-size was: Re: eat your own dog food?
Date: Sat, 12 Jan 2008 13:08:41 -0500
Message-ID: <1200161321.31540.10.camel@localhost> (raw)
In-Reply-To: <20080112172856.GD23567-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>


[-- Attachment #1: Type: text/plain, Size: 931 bytes --]

On Sat, 2008-12-01 at 15:28 -0200, Arnaldo Carvalho de Melo wrote:

> Now what seems to be the last thing to do is to follow typedefs and find
> unnamed structs, think about spinlock_t, socket_lock_t, etc.
> 

Good stuff Arnaldo - updated local tree. 
I should be able to test later today.

Dont know much about cmake, is it possible to check for elfutils version
and not depend on build_id if version < xxx?
This way i dont have to go out of my way to maintain my own versions of
elf utilities. I have to do the patch you sent earlier manually now. I
will remove it if you will fix cmake.

BTW, while perusing archs i managed i think to gather sufficiently
accurate info (;->) on the different alignments; i got lazy at the end,
but quiet a few are in the attached txt file incase you find them
useful. Double check sparc for example. I think most 64-bit hardware
looks consistent; the funnies are in 32-bit archs.

cheers,
jamal

[-- Attachment #2: eabis --]
[-- Type: text/plain, Size: 2823 bytes --]

		MIPS EABI
			=========

Sizes and alignments
--------------------

	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long		4		4 (32-bit mode)
			8		8 (64-bit mode)
	long long	8		8
	float		4		4
	double		8		8
	pointers	4		4 (32-bit mode)
			8		8 (64-bit mode)

* alignment within aggregates (structs and unions) is as above, with
  padding added if needed
* aggregates have alignment equal to that of their most aligned
  member
* aggregates have sizes which are a multiple of their alignment

ia32 Sizes and alignments
--------------------

	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long		4		4 
	long long	8		4
	float		4		4
	double		8		4
	pointers	4		4 

* alignment within aggregates (structs and unions) is as above, with
  padding added if needed
* aggregates have alignment equal to that of their most aligned
  member
* aggregates have sizes which are a multiple of their alignment
  This may result in tail padding.

ia64 Sizes and alignments
--------------------

	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long		8		8 
	long long	8		8
	float		4		4
	double		8		8
	pointers	8		8 

    * An entire structure or union object shall be aligned on the same 
      boundary as its most strictly aligned member.
    * Each member shall be assigned to the lowest available offset with the 
      appropriate alignment. This may require internal padding, depending 
      on the previous member.
    * A structure's size shall be increased, if necessary, to make it a 
      multiple of the alignment. This may require tail padding, depending 
      on the last member. 

AMD 64
-------


	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long		4		4 
			8		8 (64-bit mode)
	long long	8		4
			8		8 (64-bit mode)
	float		4		4
	double		8		4
	pointers	4		4 
			8		8 (64-bit mode)

powerpc - 32bit

	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long	        4		4
	long long	8		8
	float		4		4
	double		8		8
	long double	16		16
	pointers	4		4 

powerpc - 64bit
	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long	        8		8
	long long	8		8
	int128  	16		16
	float		4		4
	double		8		8
	long double	16		16
	pointers	8		8 


sparc:
	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long	        4		4
	long long	8		8
	float		4		4
	double		8		8
	long double	16		8
	pointers	4		4 


s390:
------
	Type		Size (bytes)	Alignment (bytes)

	char		1		1
	short		2		2
	int		4		4
	unsigned	4		4
	long	        4		4
	long long	8		8
	float		4		4
	double		8		8
	long double	16		16
	pointers	4		4 

s390-zseries
---------





















  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-10 12:42 jamal
2008-01-10 13:39 ` Arnaldo Carvalho de Melo
     [not found]   ` <20080110133926.GF22437-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-10 13:55     ` jamal
2008-01-10 14:06       ` Arnaldo Carvalho de Melo
     [not found]         ` <20080110140635.GG22437-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-10 16:39           ` Arnaldo Carvalho de Melo
     [not found]             ` <20080110163959.GJ22437-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-10 21:37               ` jamal
2008-01-10 21:44                 ` Arnaldo Carvalho de Melo
     [not found]                   ` <20080110214438.GT22437-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-11  0:45                     ` jamal
2008-01-11  1:04                       ` jamal
2008-01-10 21:39               ` Arnaldo Carvalho de Melo
     [not found]                 ` <20080110213909.GS22437-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-10 21:41                   ` jamal
2008-01-12 15:21                     ` Arnaldo Carvalho de Melo
     [not found]                       ` <20080112152109.GA23567-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-12 15:54                         ` Changing the word-size was: " Arnaldo Carvalho de Melo
     [not found]                           ` <20080112155404.GB23567-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-12 16:28                             ` Arnaldo Carvalho de Melo
     [not found]                               ` <20080112162808.GC23567-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-12 17:28                                 ` Arnaldo Carvalho de Melo
     [not found]                                   ` <20080112172856.GD23567-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-12 18:08                                     ` jamal [this message]
2008-01-12 18:42                                       ` Arnaldo Carvalho de Melo
     [not found]                                         ` <20080112184211.GA17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-13  0:42                                           ` jamal
2008-01-13  1:15                                             ` jamal
     [not found]                                               ` <20080113163106.GE17675@ghostprotocols.net>
     [not found]                                                 ` <20080113163106.GE17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-13 18:07                                                   ` Arnaldo Carvalho de Melo
     [not found]                                                     ` <20080113180730.GG17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-13 18:19                                                       ` Arnaldo Carvalho de Melo
     [not found]                                                         ` <20080113181901.GH17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-13 18:26                                                           ` Arnaldo Carvalho de Melo
     [not found]                                                             ` <20080113182657.GI17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-13 19:13                                                               ` jamal
2008-01-12 21:36                                     ` Arnaldo Carvalho de Melo
     [not found]                                       ` <20080112213635.GC17675-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2008-01-12 22:08                                         ` Arnaldo Carvalho de Melo

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