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Diffstat (limited to 'www')
| -rw-r--r-- | www/design.html | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/www/design.html b/www/design.html index b2595fd4..e6519135 100644 --- a/www/design.html +++ b/www/design.html @@ -351,13 +351,25 @@ are always the same size (on both 32 and 64 bit). Pointer and int are _not_ the same size on 64 bit systems, but pointer and long are. This is guaranteed by the LP64 memory model, a Unix standard (which Linux and MacOS X both implement, and which modern 64 bit processors such as -x86-64 were <a href=http://www.pagetable.com/?p=6>designed for</a>). See -<a href=http://www.unix.org/whitepapers/64bit.html>the LP64 standard</a> and -<a href=http://www.unix.org/version2/whatsnew/lp64_wp.html>the LP64 -rationale</a> for details.</p> +x86-64 were <a href=http://www.pagetable.com/?p=6>designed for</a>).</p> + +<p>Back +before unix.org went down, they hosted the +<a href=https://web.archive.org/web/20020905181545/http://www.unix.org/whitepapers/64bit.html>LP64 standard</a> and +<a href=https://web.archive.org/web/20020921185209/http://www.unix.org/version2/whatsnew/lp64_wp.html>the LP64 rationale</a>, but the important part is +LP64 gives all the basic C integer types defined sizes:</p> + +<table border=1 cellpadding=10 cellspacing=2> +<tr><td>C type</td><td>32 bit<br />sizeof</td><td>64 bit<br />sizeof</td></tr> +<tr><td>char</td><td>1 byte</td><td>1 byte</td></tr> +<tr><td>short</td><td>2 bytes</td><td>2 bytes</td></tr> +<tr><td>int</td><td>4 bytes</td><td>4 bytes</td></tr> +<tr><td>long</td><td>4 bytes</td><td>8 bytes</td></tr> +<tr><td>long long</td><td>8 bytes</td><td>8 bytes</td></tr> +</table> <p>Note that Windows doesn't work like this, and I don't care. -<a href=http://blogs.msdn.com/oldnewthing/archive/2005/01/31/363790.aspx>The +<a href=https://devblogs.microsoft.com/oldnewthing/20050131-00/?p=36563>The insane legacy reasons why this is broken on Windows are explained here.</a></p> <b><h3>Signedness of char</h3></b> |