How to read a condition flag in ARMv7 Thumb-2 assembly?

I'm using an ARMv7 processor with Thumb-2 instructions.

I have executed an ADD, SUB or a CMP. Now I want to move the condition flag LE to r2. After this, r2 should contain either 0 or 1.

I've been looking through the Thumb-2 manual, but I haven't found a conditional MOV instruction or a special instruction to read the flags.

What's the most efficient way to do this? Thanks in advance!

Solution

You need to start a conditional block with an ite (if-then-else) instruction and then just use conditional assignments:

ite le        @ if-then-else (le)
movle r2, #1  @ if (le) then r2 = #1
movgt r2, #0  @         else r2 = #0

In general, you can use arbitrary conditional instructions in Thumb-2 if you prefix them with appropriate IT-instructions. Read the manual for details.