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Date: Wed, 28 Sep 2011 11:53:22 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: 64 bit codes
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Date: 2011-09-28T11:53:22+02:00
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On 27.09.11 17:49, Bill Findlay wrote:

> So, while your caveats are of course valid, there certainly are workloads
> that benefit greatly from working in 64 bits.

IBM confirms:

"64 bit register use in 32 bit applications: GCC will exploit the
 availability of 64 bit registers in 32 bit applications when compiling
 with -m31 -mzarch. This provides a significant performance gain for 32
 bit applications built this way. The versions of the Linux Kernel,
 GNU Binutils, GNU C Library and GDB as documented here provide the
 support required by this GCC feature."

http://www.ibm.com/developerworks/linux/linux390/toolchain.html

I hadn't known that there are 31-bit systems and correspondingly,
a -m31 switch for GCC. Wow.