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Re: Image scaling performance

From: Vladimir 'phcoder' Serbinenko
Subject: Re: Image scaling performance
Date: Tue, 24 Feb 2015 10:51:33 +0100

Did you try to look at ASM of the function in question? Do you compile to thumb? Multiplication sometimes generates function calls in thumb. Try marking the scaling function as arm explicitly

Le 2015-02-24 10:39, "Michael Zimmermann" <address@hidden> a écrit :
Any ideas what could slow down the image scaling algorithm?
The only reasons I could think of would either be slow memory or some
compiler problems. Since my Ram is mapped cachable I don't think the
RAM is too slow.

I even forces using the Nearest neighbor algorithm already. It speeds
things up a lot but it's not as fast as you'd expect.

Some technical info:
Linaro GCC 4.9
MMU setup is done by the previous bootloader(I disabled GRUB's (uboot)
MMU setup - it prooved to be faster)

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