unimore/hpc-2022-g3
unimore/hpc-2022-g3
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Use unsigned int as indexes to make overflows harder

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Steffo 2022-11-29 17:24:48 +01:00 committed by GitHub
parent 029010045c
commit ee33d3861b
Signed by: github
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 9 deletions
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18
atax/atax.cu
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@ -28,7 +28,7 @@
__host__ static void init_array(DATA_TYPE** A, DATA_TYPE* X)
{
/* X = [ 3.14, 6.28, 9.42, ... ] */
for (int y = 0; y < NY; y++)
for (unsigned int y = 0; y < NY; y++)
{
X[y] = y * M_PI;
}
@ -42,11 +42,11 @@ __host__ static void init_array(DATA_TYPE** A, DATA_TYPE* X)
* ...
* ]
*/
for (int x = 0; x < NX; x++)
for (unsigned int x = 0; x < NX; x++)
{
for (int y = 0; y < NY; y++)
for (unsigned int y = 0; y < NY; y++)
{
A[x][y] = ((DATA_TYPE)x * (y + 1)) / NX;
A[x][y] = (DATA_TYPE)(x * (y + 1)) / NX;
}
}
}
@ -61,7 +61,7 @@ __host__ static void init_array(DATA_TYPE** A, DATA_TYPE* X)
*/
__host__ static void print_array(DATA_TYPE* Y)
{
for (int x = 0; x < NX; x++)
for (unsigned int x = 0; x < NX; x++)
{
fprintf(stderr, DATA_PRINTF_MODIFIER, Y[x]);
}
@ -78,21 +78,21 @@ __host__ static void print_array(DATA_TYPE* Y)
*/
__host__ static void kernel_atax(DATA_TYPE** A, DATA_TYPE* X, DATA_TYPE* Y)
{
for (int x = 0; x < NY; x++)
for (unsigned int x = 0; x < NY; x++)
{
Y[i] = 0;
}
for (int i = 0; i < NX; i++)
for (unsigned int i = 0; i < NX; i++)
{
DATA_TYPE tmp = 0;
for (int j = 0; j < NY; j++)
for (unsigned int j = 0; j < NY; j++)
{
tmp += A[i][j] * X[j];
}
for (int j = 0; j < NY; j++)
for (unsigned int j = 0; j < NY; j++)
{
Y[j] = Y[j] + A[i][j] * tmp;
}