[Tinyos-devel] what version of Gcc should I be using? Possible bug?

[Eric Decker]

I've been chasing a problem where the following code doesn't do the right
thing.
  bool isSetSCCI() {
    return (TACCTL2 & SCCI);
  }

SCCI has the value 0x0400 (bit 10 of TACCTLx).  I would expect this to
return 0x0400 if
SCCI is set and 0 otherwise.  The code generated both with and without
optimization is
given below.  It basically does nothing.  Am I missing something?  (As I get
older my
brain definitely misses things....)

(gdb) x/3i 460c
0x460c <GPSByteCollectP$isSetSCCI>:     mov     &0x0166,r15     ;src addr
0x0166
0x4610 <GPSByteCollectP$isSetSCCI+4>:   clr     r15             ;
0x4612 <GPSByteCollectP$isSetSCCI+6>:   ret


Here is the code I'm running.  I'm a bit dubious of gcc 4.1.2.  What version
should I be
running?

cire-laptop (47): ncc --version
ncc: 1.2.4
nescc: 1.2.9
gcc: gcc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


-- 
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.millennium.berkeley.edu/pipermail/tinyos-devel/attachments/20080520/7e61a2cf/attachment.htm