Re: MIPS optimizing compiler

Bob Wilson <robert.wilson@Eng.Sun.COM>
7 Sep 1997 15:00:26 -0400

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From: Bob Wilson <robert.wilson@Eng.Sun.COM>
Newsgroups: comp.compilers
Date: 7 Sep 1997 15:00:26 -0400
Organization: WorkShop Developer Products, Sun Microsystems
References: 97-08-079 97-08-089 97-09-008
Keywords: linker

Fergus Henderson wrote:
> The flaws in the SGI/MIPS implementation mentioned above are all
> addressable. Link-time optimization information can be placed in (a
> special section of) standard object files, so that existing makefiles
> do not need to be modified. There is no need to require the use of a
> different code model (ABI) in order to use link-time optimizations.
> The use of link-time optimizations need not prevent the use of DSOs.

It's ironic that everyone is identifying SGI/MIPS with the old ucode
style of link-time optimization, since SGI/MIPS has already
implemented and shipped a compiler that does what Fergus suggests.
With certain options, the MIPSpro compilers will produce special ELF
object files that contain all the high-level intermediate
representation necessary for link-time optimizations. The actual code
generation doesn't happen until link-time, but since the object files
look like standard .o files you don't need to completely rewrite your

Bob Wilson
Authoring and Development Tools, Sun Microsystems, Inc.

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