atomics

[BogDan]

One more thing, "int atomic_xxxxxx" must NOT be inline functions because it will break the ABI !

BogDan.



>________________________________
>From: BogDan <bog_dan_ro at yahoo.com>
>To: "thomas.senyk at nokia.com" <thomas.senyk at nokia.com>; "necessitas-devel at kde.org" <necessitas-devel at kde.org>
>Sent: Thursday, July 14, 2011 4:46 PM
>Subject: Re: atomics
>
>
>Sorry :)
>Attached !
>
>
>BogDan.
>
>
>
>>________________________________
>>From: "thomas.senyk at nokia.com" <thomas.senyk at nokia.com>
>>To: bog_dan_ro at yahoo.com; necessitas-devel at kde.org
>>Sent: Thursday, July 14, 2011 4:38 PM
>>Subject: RE: atomics
>>
>>The whitespaces and everything seams to be quite broken in
your code-past :)
>>
>>Could you create a projects, tar it and send it as attachment? This would help a lot and more people will be willing to run it :)
>>
>>Greets
>>Thomas
>>________________________________________
>>From: ext BogDan [bog_dan_ro at yahoo.com]
>>Sent: Friday, July 08, 2011 3:33 PM
>>To: necessitas-devel at kde.org
>>Subject: atomics
>>
>>Hello Folks,
>>
>>I've made a small application to test current available atomic implementations on android.
>>This are the results on a HTC sensation device:
>>
>>
>>Test 1
>>===============================
>>USING SMP safe ASM instructions
>>--------------------------------------------------------------------
>>Executing test_atomic_cmpxchg_ASM took 14714
>>Executing test_atomic_cmpxchg_GCC took 15685
>>Executing
test_atomic_cmpxchg_Android took 8874
>>Executing test_atomic_inc_ASM took 14310
>>Executing test_atomic_inc_GCC took 16190
>>Executing test_atomic_inc_Android took 8351
>>===============================
>>Test 2
>>===============================
>>USING SMP unsafe ASM instructions
>>--------------------------------------------------------------------
>>Executing test_atomic_cmpxchg_ASM took 6904
>>Executing test_atomic_cmpxchg_GCC took 15814
>>Executing test_atomic_cmpxchg_Android took 8864
>>Executing test_atomic_inc_ASM took 6404
>>Executing test_atomic_inc_GCC took 16048
>>Executing test_atomic_inc_Android took 8198
>>===============================
>>
>>
>>
>>And this is the
code:
>>
>>#include<QDebug>
>>#include<QDateTime>
>>#include<sys/atomics.h>
>>staticconstintLOOPS=100000000;
>>#defineSMP_SAFE
>>#ifdefSMP_SAFE
>>#definesmp_mb__asm____volatile__("dmb":::"memory")
>>#else
>>#definesmp_mb
>>#endif
>>intatomic_cmpxchg(int&_q_value,intexpectedValue,intnewValue)
>>{
>>registerintresult;
>>smp_mb;
>>asmvolatile("0:\n"
>>"ldrex%[result],[%[_q_value]]\n"
>>"eors%[result],%[result],%[expectedValue]\n"
>>"itteq\n"
>>"strexeq%[result],%[newValue],[%[_q_value]]\n"
>>"teqeq%[result],#1\n"
>>"beq0b\n"
>>:[result]"=&r"(result),
>>"+m"(_q_value)
>>:[expectedValue]"r"(expectedValue),
>>[newValue]"r"(newValue),
>>[_q_value]"r"(&_q_value)
>>:"cc");
>>smp_mb;
>>returnresult==0;
>>}
>>voidtest_atomic_cmpxchg_ASM()
>>{
>>inttest=0;
>>for(inti=0;i<LOOPS;i++)
>>{
>>atomic_cmpxchg(test,test,test+1);
>>}
>>qDebug()<<test;
>>}
>>voidtest_atomic_cmpxchg_GCC()
>>{
>>inttest=0;
>>for(inti=0;i<LOOPS;i++)
>>{
>>__sync_bool_compare_and_swap(&test,test,test+1);
>>}
>>qDebug()<<test;
>>}
>>voidtest_atomic_cmpxchg_Android()
>>{
>>inttest=0;
>>for(inti=0;i<LOOPS;i++)
>>{
>>__atomic_cmpxchg(test,test+1,&test);
>>}
>>qDebug()<<test;
>>}
>>intatomic_inc(int&_q_value,intvalueToAdd)
>>{
>>registerintoriginalValue;
>>registerintnewValue;
>>registerintresult;
>>smp_mb;
>>asmvolatile("0:\n"
>>"ldrex%[originalValue],[%[_q_value]]\n"
>>"add%[newValue],%[originalValue],%[valueToAdd]\n"
>>"strex%[result],%[newValue],[%[_q_value]]\n"
>>"teq%[result],#0\n"
>>"bne0b\n"
>>:[originalValue]"=&r"(originalValue),
>>[newValue]"=&r"(newValue),
>>[result]"=&r"(result),
>>"+m"(_q_value)
>>:[valueToAdd]"r"(valueToAdd),
>>[_q_value]"r"(&_q_value)
>>:"cc");
>>smp_mb;
>>returnoriginalValue;
>>}
>>voidtest_atomic_inc_ASM()
>>{
>>inttest=0;
>>intlast=0;
>>for(inti=
0;i<LOOPS;i++)
>>{
>>last=atomic_inc(test,1);
>>}
>>qDebug()<<test<<last;
>>}
>>voidtest_atomic_inc_GCC()
>>{
>>inttest=0;
>>intlast=0;
>>for(inti=0;i<LOOPS;i++)
>>{
>>last=__sync_fetch_and_add(&test,1);
>>}
>>qDebug()<<test<<last;
>>}
>>voidtest_atomic_inc_Android()
>>{
>>inttest=0;
>>intlast=0;
>>for(inti=0;i<LOOPS;i++)
>>{
>>last=__atomic_inc(&test);
>>}
>>qDebug()<<test<<last;
>>}
>>voidtestAtomics()
>>{
>>#ifdefSMP_SAFE
>>qDebug()<<"USINGSMPsafeASMinstructions";
>>#else
>>qDebug()<<"USINGSMPunsafeASMinstructions";
>>#endif
>>QDateTimestart=QDateTime::currentDateTimeUtc();
>>test_atomic_cmpxchg_ASM();
>>qDebug()<<"Executingtest_atomic_cmpxchg_ASMtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>>start=QDateTime::currentDateTimeUtc();
>>test_atomic_cmpxchg_GCC();
>>qDebug()<<"Executingtest_atomic_cmpxchg_GCCtook"<<start
.msecsTo(QDateTime::currentDateTimeUtc());
>>start=QDateTime::currentDateTimeUtc();
>>test_atomic_cmpxchg_Android();
>>qDebug()<<"Executingtest_atomic_cmpxchg_Androidtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>>start=QDateTime::currentDateTimeUtc();
>>test_atomic_inc_ASM();
>>qDebug()<<"Executingtest_atomic_inc_ASMtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>>start=QDateTime::currentDateTimeUtc();
>>test_atomic_inc_GCC();
>>qDebug()<<"Executingtest_atomic_inc_GCCtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>>start=QDateTime::currentDateTimeUtc();
>>test_atomic_inc_Android();
>>qDebug()<<"Executingtest_atomic_inc_Androidtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>>}
>>
>>
>>Please try this code on a different devices and post the results here.
>>
>>Thanks,
>>BogDan.
>>_______________________________________________
>>Necessitas-devel mailing
list
>>Necessitas-devel at kde.org
>>https://mail.kde.org/mailman/listinfo/necessitas-devel
>>
>>
>>
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