[microblaze-uclinux] Xilinx QUIZ: 4=4 or 4=3 ?? EDK C compiler bugs again !!

["Antti Lukats" <lukats@xxxxxxxxx>]

just posting here too,

-----------------------------------------------------

A small Quiz, for C programmers

****** c code starts here *****
 temp = docrc(temp2);
 xil_printf("CRC: %08X\r",temp);
 temp = docrc(temp2+1);
 xil_printf("CRC: %08X\r",temp);

xil_printf("\r\n-- 1");
 temp = docrc(temp2);
 xil_printf("CRC: %08X\r",temp);
xil_printf("\r\n-- 2");
 temp = docrc(temp2+1);
 xil_printf("CRC: %08X\r",temp);
xil_printf("\r\n-- 3");

****** c code ends here *****

the above c program should print "CRC: " how many times?
did you guess 4?

wrong! Correct answer is 3 if the code is compiled with microblaze GCC
provided by Xilinx, here is the terminal log:

******  terminal log starts here *****
CRC: 53EE6CD2
-- 1CRC: 1142FDE5
-- 2CRC: 53EE6CD2
-- 3
****** terminal log ends here *****

the first printout is defenetly missing. I am not dreaming, another person
did verify the c code and terminal print.

This is exactly the same kind of problem I had with mb gcc llooooong time
ago, then I also was forced to add

call_donothing_bullshit();

in some places of my code! thoes where really dummy call's but without them
the code did not work.

I did expect this kind of problem not to exist any more. But now I dont
wonder any more why John Williams can not use EDK 7.1 GCC for uClinux
compiling, if such type of bugs exist I would be real surprised if the
compiled linux kernel would work

Antti
PS I will ZIP the full project archive and send to some Xilinx personel if
they are interested, but I am not opening a webcase. Even if the webcase
management takes only 30 minutes of my time. I dont have that time right now
(to be wasted).

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