On Feb 4, 6:00 pm, Brad Boyer <[EMAIL PROTECTED]> wrote: > On Mon, Feb 04, 2008 at 12:27:25PM -0800, James Kimble wrote: > > I've got another weird thing going on here. I can't assign values > > greater that 128 to integers. When the program reaches the statement > > that does that I get the same "Illegal instruction" message and the > > program exits without completing. For example if I just add a for loop > > to the end of the above program it will only work for loop values less > > than 128. At 128 the program will exit and give the "Illegal > > instruction" message. What the heck is going on here? > > I presume you are assigning constant values into a variable? My first > guess in that case would be that the compiler is emitting a MOVEQ > instruction but not properly checking the limit on the immediate data > field (an 8-bit signed quantity) against the value being assigned. This > also implies a bug in the assembler where it just shoves the value onto > the instruction word without masking out the higher bits. Seems like an > unlikely bug, but stranger things have happened. If it only dies at > exactly 128, it could be an off by one error. Have you tried going > directly to much larger values and avoiding the specific value of 128? > > I would suggest trying to disassemble that part of the object file and > see what you get. It might also be worthwhile to look at the assembly > code generated by the compiler (add -save-temps to your gcc options). > > Brad Boyer > [EMAIL PROTECTED] > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Sorry, stupid, stupid, stupid. Been working on this for too long. I'm getting punchy. I use a makefile for most things but I was working with some early test code for a few things and was compiling from the command line. Forgot to use the "-mcfv4e" compiler option. Sorry to waste anyone's cycles on this.... -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
