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Gotta love compilers... On SDCC 2.6.0 the following:

LATC = 1 << i;

Compiled to this:

;       .line   32; driver.c    LATC = 1 << i;
MOVLW   0x01
MOVWF   _LATC
MOVF    r0x00, W
BZ      _00111_DS_
NEGF    WREG
BCF     STATUS, 0
_00112_DS_:
RLCF    _LATC, F
ADDLW
0x01
BNC
_00112_DS_
_00111_DS_:

Which caused some real strangeness as the hardware connected to LATC was
running at high speed and did not like getting turned on at the wrong
time. I checked the headers too, and LATC is correctly declared
volatile. Setting a temp variable to 1 << i, and then assigning that to
LATC fixed the problem. My copy of SDCC is rather old, 2.8.0 is the
current stable version, but it does show why you need to know assembly.

- -- 
http://petertodd.org
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