Re: [Qemu-devel] [Consult] tilegx: Is it a qemu's system bug?

[Chen Gang]

On 4/26/15 03:30, Richard Henderson wrote:
> On 04/25/2015 05:12 AM, Chen Gang wrote:
>> Hello All:
>>
>> I want to consult an issue I met below for the latest master branch, is
>> it a qemu's bug? (it is about ctz/cnttz instruction for tilegx)
>>
>>   OP: 
>>    ld_i32 tmp0,env,$0xfffffffffffffffc
>>    movi_i32 tmp1,$0x0
>>    brcond_i32 tmp0,tmp1,ne,$L0
>>    movi_i64 tmp3,$0x0                    /* Initialize tmp3 */
>>    set_label $L1 
>>    shr_i64 tmp2,r2,tmp3
> 
> You can't keep temporaries live across basic blocks.
> That is, across set_label, br, or brcond.  In that case
> you'd have to use tcg_new_local_temp() instead.
> 
> That said, you shouldn't open-code ctz but instead use
> a helper function and use ctz64().
>

Thank you very much for your valuable reply! It will save my much time
resources for analyzing.

And I shall try to let tilegx print "hello world" within this month
(although it seems really difficult to me, at present).


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed