Re: [Qemu-devel] [PATCH 51/52] target-m68k: add cmpm

[Laurent Vivier]

Le 07/05/2016 à 00:00, Richard Henderson a écrit :
> On 05/04/2016 11:21 AM, Laurent Vivier wrote:
>> +    reg = AREG(insn, 0);
>> +    src = gen_load(s, opsize, reg, 1);
>> +    tcg_gen_addi_i32(reg, reg, opsize_bytes(opsize));
>> +
>> +    reg = AREG(insn, 9);
>> +    dest = gen_load(s, opsize, reg, 1);
>> +    tcg_gen_addi_i32(reg, reg, opsize_bytes(opsize));
> 
> Delay the writeback to the first areg until after the second load.

We can't delay because we can have "cmpm (%a0)+,(%a0)+" that is used to
compare two consecutive memory contents.

Laurent