/*
    Copyright (c) 2005-2020 Intel Corporation

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

// Program for basic correctness testing of assembly-language routines.
#include "harness_defs.h"
//for ICC builtins mode the test will be skipped as
//macro __TBB_GCC_BUILTIN_ATOMICS_PRESENT used to define __TBB_TEST_SKIP_GCC_BUILTINS_MODE
//will not be defined (it is explicitly disabled for ICC)
#if __TBB_TEST_SKIP_GCC_BUILTINS_MODE
#include "harness.h"
int TestMain() {
    REPORT("Known issue: GCC builtins aren't available\n");
    return Harness::Skipped;
}
#else

#include "tbb/task.h"

#include <new>
#include "harness.h"

using tbb::internal::reference_count;

//TODO: remove this function when atomic function __TBB_XXX are dropped
//! Test __TBB_CompareAndSwapW
static void TestCompareExchange() {
    ASSERT( intptr_t(-10)<10, "intptr_t not a signed integral type?" );
    REMARK("testing __TBB_CompareAndSwapW\n");
    for( intptr_t a=-10; a<10; ++a )
        for( intptr_t b=-10; b<10; ++b )
            for( intptr_t c=-10; c<10; ++c ) {
// Workaround for a bug in GCC 4.3.0; and one more is below.
#if __TBB_GCC_OPTIMIZER_ORDERING_BROKEN
                intptr_t x;
                __TBB_store_with_release( x, a );
#else
                intptr_t x = a;
#endif
                intptr_t y = __TBB_CompareAndSwapW(&x,b,c);
                ASSERT( y==a, NULL );
                if( a==c )
                    ASSERT( x==b, NULL );
                else
                    ASSERT( x==a, NULL );
            }
}

//TODO: remove this function when atomic function __TBB_XXX are dropped
//! Test __TBB___TBB_FetchAndIncrement and __TBB___TBB_FetchAndDecrement
static void TestAtomicCounter() {
    // "canary" is a value used to detect illegal overwrites.
    const reference_count canary = ~(uintptr_t)0/3;
    REMARK("testing __TBB_FetchAndIncrement\n");
    struct {
        reference_count prefix, i, suffix;
    } x;
    x.prefix = canary;
    x.i = 0;
    x.suffix = canary;
    for( int k=0; k<10; ++k ) {
        reference_count j = __TBB_FetchAndIncrementWacquire((volatile void *)&x.i);
        ASSERT( x.prefix==canary, NULL );
        ASSERT( x.suffix==canary, NULL );
        ASSERT( x.i==k+1, NULL );
        ASSERT( j==k, NULL );
    }
    REMARK("testing __TBB_FetchAndDecrement\n");
    x.i = 10;
    for( int k=10; k>0; --k ) {
        reference_count j = __TBB_FetchAndDecrementWrelease((volatile void *)&x.i);
        ASSERT( j==k, NULL );
        ASSERT( x.i==k-1, NULL );
        ASSERT( x.prefix==canary, NULL );
        ASSERT( x.suffix==canary, NULL );
    }
}

static void TestTinyLock() {
    REMARK("testing __TBB_LockByte\n");
    __TBB_atomic_flag flags[16];
    for( unsigned int i=0; i<16; ++i )
        flags[i] = (__TBB_Flag)i;
#if __TBB_GCC_OPTIMIZER_ORDERING_BROKEN
    __TBB_store_with_release( flags[8], 0 );
#else
    flags[8] = 0;
#endif
    __TBB_LockByte(flags[8]);
    for( unsigned int i=0; i<16; ++i )
        #ifdef __sparc
        ASSERT( flags[i]==(i==8?0xff:i), NULL );
        #else
        ASSERT( flags[i]==(i==8?1:i), NULL );
        #endif
    __TBB_UnlockByte(flags[8]);
    for( unsigned int i=0; i<16; ++i )
        ASSERT( flags[i] == (i==8?0:i), NULL );
}

static void TestLog2() {
    REMARK("testing __TBB_Log2\n");
    for( uintptr_t i=1; i; i<<=1 ) {
        for( uintptr_t j=1; j<1<<16; ++j ) {
            if( uintptr_t k = i*j ) {
                uintptr_t actual = __TBB_Log2(k);
                const uintptr_t ONE = 1; // warning suppression again
                ASSERT( k >= ONE<<actual, NULL );
                ASSERT( k>>1 < ONE<<actual, NULL );
            }
        }
    }
}

static void TestPause() {
    REMARK("testing __TBB_Pause\n");
    __TBB_Pause(1);
}

static void TestTimeStamp() {
    REMARK("testing __TBB_time_stamp");
#if defined(__TBB_time_stamp)
    tbb::internal::machine_tsc_t prev = __TBB_time_stamp();
    for ( int i=0; i<1000; ++i ) {
        tbb::internal::machine_tsc_t curr = __TBB_time_stamp();
        ASSERT(curr>prev, "__TBB_time_stamp has returned non-monotonically increasing quantity");
        prev=curr;
    }
    REMARK("\n");
#else
    REMARK(" skipped\n");
#endif
}

int TestMain () {
    __TBB_TRY {
        TestLog2();
        TestTinyLock();
        TestCompareExchange();
        TestAtomicCounter();
        TestPause();
        TestTimeStamp();
    } __TBB_CATCH(...) {
        ASSERT(0,"unexpected exception");
    }
    return Harness::Done;
}
#endif // __TBB_TEST_SKIP_BUILTINS_MODE
