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- Register move instructions
- ==========================
- Document conventions
- --------------------
- Notation: ``Rd, Rn`` denote ARM registers R0-R15. ``immN`` denotes an immediate
- value having a width of N bits. These instructions affect the condition flags.
- Register moves
- --------------
- Where immediate values are used, these are zero-extended to 32 bits. Thus
- ``mov(R0, 0xff)`` will set R0 to 255.
- * mov(Rd, imm8) ``Rd = imm8``
- * mov(Rd, Rn) ``Rd = Rn``
- * movw(Rd, imm16) ``Rd = imm16``
- * movt(Rd, imm16) ``Rd = (Rd & 0xffff) | (imm16 << 16)``
- movt writes an immediate value to the top halfword of the destination register.
- It does not affect the contents of the bottom halfword.
- * movwt(Rd, imm32) ``Rd = imm32``
- movwt is a pseudo-instruction: the MicroPython assembler emits a ``movw`` followed
- by a ``movt`` to move a 32-bit value into Rd.
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