[U-Boot-Users] [PATCH] Fixed cfi flash read uchar bug.
wd at denx.de
Fri Dec 22 22:33:58 CET 2006
in message <1166809358.26147.32.camel at kaboom.lisle.iphase.com> you wrote:
> > Did you compare the generated code?
> Nope, but that's a good idea. I'll compile and objdump the various
> scenarios next year.
I just did this - this is always pretty instructive in such situ-
ations. GCC-4.x optimizes much better, but will also unremorsefully
punish even small sins like a forgotten "volatile".
text data bss dec hex filename
202340 12104 32056 246500 3c2e4 /tmp/ELDK-3.1.1/u-boot
185751 12016 32048 229815 381b7 /tmp/ELDK-4.0/u-boot
That's nearly 10% difference in code size...
But here the difference is not in this function - both compile to
exactly the same code. Obviously some other functions in the CFI
driver are different, though.
> Merry Christmas from a very bad quoting net citizen. :P
Thanks, and Merry Christmas, too.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
It is easier to change the specification to fit the program than vice
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