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Re: arm,gcc and dsp instructions
- From: Eric Christopher <echristo at apple dot com>
- To: Victor Librado <vlibrado at bioingenieria dot es>
- Cc: gcc at gcc dot gnu dot org
- Date: Fri, 20 Apr 2007 01:30:17 -0700
- Subject: Re: arm,gcc and dsp instructions
- References: <462878C4.8070709@bioingenieria.es>
On Apr 20, 2007, at 1:24 AM, Victor Librado wrote:
Hello all,
I`m working with an arm core 9260EJ-S under Linux (Linux kernel
2.6.15; armv5l-linux toolchain with compiler gnu gcc 3.4.2). I
would like to take advantage of the asm DSP like functions the core
provides. I compile this way:
arm-linux-gnu -msoft-float -mtune=arm926ejs -S mul.c
Code generated uses these assembly dsp instructions sometimes (I
think critical parts should be assembly written), but it exists any
kind of patch or derivative to "tell" gcc to improve the code
generated using these kind of 1 cycle instructions more offently?
You'll want to probably use -march=<variant> so that it will generate
the instructions. Tuning is otherwise just costs, and some universal
features of the core that would also run on more generic arm chips.
-eric