BUG about cpse skip adiw

[tw f]

//filename: test.S

.global start

.text

start:

        ldi  r16, 0x5a

        ldi  r17, 0x5a

        cpse r16, r17

        adiw r24, 0x0f　// <--if 0x0e or 0x0d, skip to nop;2, else skip to nop;1  

        nop; 1

        nop; 2

        nop; 3

commands:

$ avr-gcc -c -x assembler-with-cpp -mmcu=atmega128 -Wa,-D,-g,--gstabs test.S -o test.o

$ avr-ld test.o -o test.elf -g -mavr51

$ simavr -t -g -v -m atmega128 -f 16000000 test.elf

$ avr-gdb test.elf

(gdb) target remote :1234

Remote debugging using :1234

start () at test.S:4

4 ldi  r16, 0x5a

(gdb) s

5 ldi  r17, 0x5a

(gdb) s

6 cpse r16, r17

(gdb) s

9 nop; 2 <-------------skip two words?

(gdb) 

version:

gcc-avr 5.4

GNU ld (GNU Binutils) 2.26.20160125

gdb-avr 7.7-4

simavr 1.5

OS:

Linux Mint 19

[GilesA]

Not reproducible, at least not with the code in my fork.