Conditional Assembly instruction in C

[cosmapa2]

Posted on April 19, 2010 at 17:25

Conditional Assembly instruction in C

[andrewpellett9]

Posted on May 17, 2011 at 13:47

I'm assuming you're using an stm32 processor, which only implements the Thumb-2 ISA (not Thumb or ARM).

Thumb-2 doesn't support conditional suffixes on all instructions, but it does give an IT instruction that can be used to subject the following instructions to conditional execution.

[cosmapa2]

Posted on May 17, 2011 at 13:47

Thanks. I've been looking everywhere for detailed info and examples on how to use the IT instruction. Can someone please show how the 3-instruction sequence below must be rewritten using the IT instruction. 

   sub r0, r1, r0     

   movmi r0, #0

   movpl r0, #1