PowerQuad corrupts memory

[Peter19]

I am running example frdmmcxn947_powerquad_cmsis and extended size a bit.

Now memory gets corrupted around the locals so it looks to me like powerquad writes outside the expected memory.

static void arm_mat_add_q31Example(void)
{
    uint32_t srcRows, srcColumns; /* Temporary variables */
    arm_status status;
    arm_matrix_instance_q31 addMatrixA31;
    arm_matrix_instance_q31 addMatrixB31;
    arm_matrix_instance_q31 addMatrixR;
    #define MATRIX_SIZE 32
    q31_t A31[MATRIX_SIZE]       = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32};
    q31_t B31[MATRIX_SIZE]       = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320};
    q31_t addResult[MATRIX_SIZE] = {0};
    q31_t addRef[MATRIX_SIZE]    = {11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198, 209, 220, 231, 242, 253, 264, 275, 286, 297, 308, 319, 330, 341, 352};
    uint16_t rows = MATRIX_SIZE;
    uint16_t cols = 1;

    /* Initialise Matrix Instance addMatrixM1 with numRows, numCols and data array(M1) */
    srcRows    = rows;
    srcColumns = cols;
    arm_mat_init_q31(&addMatrixA31, srcRows, srcColumns, A31);

    /* Initialise Matrix Instance addMatrixM1 with numRows, numCols and data array(M1) */
    srcRows    = rows;
    srcColumns = cols;
    arm_mat_init_q31(&addMatrixB31, srcRows, srcColumns, B31);

    /* Initialise Matrix Instance addMatrixM1 with numRows, numCols and data array(M1) */
    srcRows    = rows;
    srcColumns = cols;
    arm_mat_init_q31(&addMatrixR, srcRows, srcColumns, addResult);

    status = arm_mat_add_q31(&addMatrixA31, &addMatrixB31, &addMatrixR);
    EXAMPLE_ASSERT_TRUE(status == ARM_MATH_SUCCESS);

    for (uint32_t i = 0; i < MATRIX_SIZE; i++)
    {
        EXAMPLE_ASSERT_TRUE(addRef[i] == addMatrixR.pData[i]);
    }
}

[Celeste_Liu · Accepted solution]

Hello @Peter19 ,

Thanks for your post. The reason is that there are restrictions on the dimensions of the power_quad matrix operations. It only supports a maximum size of 16 * 16, and setting the row to 32 is not reasonable. You can find the detailed information in the Reference Manual. See the figure below.

Hope it can help you.

BRs,

Celeste

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[Peter19]

Hello @Celeste_Liu
It is not obvious to me that 32x1 is not supported since it is much smaller than 16x16...
Regards
/Peter

[Celeste_Liu]

Hello @Peter19 ,

What I mean is that neither a single dimension of the matrix, be it the row or the column, can exceed 16. If you change 32x1 to 16x2, it will work. Similarly, I've tested the maximum size of 16x16 and there was no problem.

BRs,

Celeste