Follow-up Comment #1, bug #40003 (project avr-libc):

Forgot to add an example:

In the case of wdt_enable(WDTO_15MS), the assembled output for targets such as
the ATtiny85:
        ldi     r18, 0x08
        ldi     r24, 0x18
        ldi     r25, 0x00
        in      r0, 0x3f
        cli
        wdr
        out     0x21, r24
        out     0x3f, r0
        out     0x21, r18

With the patch in place:
        ldi     r25, 0x08
        ldi     r24, 0x18
        in      r0, 0x3f
        cli
        wdr
        out     0x21, r24
        out     0x3f, r0
        out     0x21, r25



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