Re: [avr-gcc-list] Problem with Bit Shift using WinAVR20071221rc1

[hutchinsonandy]

Looks like a bug but

Cut and paste assembler from .lss file into email.

Also try same thing with different optimisations

-O0 (none) -O1 (some) -O2 -O3 -Os

If you are using make file look for optimsation variable about 20 lines 
or so from top.

This will give us a clue :-)


Andy



-----Original Message-----
From: Moritz Federspiel <address@hidden>
To: address@hidden
Sent: Tue, 25 Mar 2008 9:41 am
Subject: [avr-gcc-list] Problem with Bit Shift using WinAVR20071221rc1


Hello everyone!
I got a little Problem on this simple Code:

/-------------code start-------------------/

uint32_t i; t;

for(i=0; i<20; i++)
  t = (1<<i);

/-------------code stop-------------------/

The results of this should be:
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
-->4294934528

after the 16384 i get 4294934528, I dont know where the problem is.

I cant code in asm, but i watched the produced asm code in AVR-Studios 
Debugger and i noticed that only 2 of the 4 bits are copied in the used 
registers.
This might be a Compiler failure, or my Code is wrong, or my Compiler 
Flags are not correct.


Have you got any solutions for me? I'm not able to write inline asm 
code :(


regards MoFe



_______________________________________________
AVR-GCC-list mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/avr-gcc-list