Add comment about dividing by 4

The comment clarifies that because we track label addresses in
32bit words, but that immediate values are in bytes, the code
needs to divide immediate values by 4, while leaving symbols
(label) addresses as-is.

Author: wnienhaus

esp32_ulp/opcodes.py

@@ -619,6 +619,7 @@ def i_jump(target, condition='--'):
         raise ValueError("invalid flags condition")
     if target.type == IMM or target.type == SYM:
         _bx.dreg = 0
+        # we track label addresses in 32bit words, but immediate values are in bytes and need to get divided by 4.
         _bx.addr = get_abs(target) if target.type == SYM else get_abs(target) >> 2  # bitwise version of "// 4"
         _bx.unused = 0
         _bx.reg = 0