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Bugs item #558177, was opened at 2002-05-20 03:30
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=100599&aid=558177&group_id=599

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Dave McGuire (dpmcguire)
Assigned to: Nobody/Anonymous (nobody)
Summary: incorrect code for empty while loop

Initial Comment:

  I believe I've found a code generation problem.  I'm
using 2.3.2, fresh out of CVS as of today.  I'm
generating code for an 8051-derived processor, the
Philips 89C664.

  This code snippet:

  while (i2c_status == I2C_BUSY)
    ;

  Generates this assembler output:

;
i2c.c:90: while (i2c_status == I2C_BUSY)
00101$:
; Peephole 132   changed ljmp to sjmp
	sjmp 00101$

  In this routine, it is assumed that an interrupt
service routine will change the i2c_status variable
while the loop is executing.  Adding some dummy code to
the body of the while loop causes a proper cjne-based
loop to be generated in the assembler output.

  Otherwise my SDCC experience has been very positive.
 I am very happy with it and have now dumped the Keil
product altogether.


           -Dave McGuire
            mcguire@...


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