fine-tune waters + simulate worst-case
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04a2ee3f45
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a1393d2e14
@ -51,14 +51,18 @@ __attribute__((noinline)) static void trigger_Qemu_break( void )
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while (1) {
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}
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}
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// #define DEBUG_WCET(A) {A}
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// if this macro is set, the code will be modified to produce the worst case
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#define DEBUG_WCET(A) {A}
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// #define WCET_END(A)
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#define WCET_END(A) {A}
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#ifdef DEBUG_WCET
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#define WCET_CLAMP(X, LB, UB, LABEL) PRINT_TIME(UB,LABEL)
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#define DEBUG_VAL(X,D) (D)
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// #define WCET_CLAMP(X, LB, UB, LABEL) PRINT_TIME(UB,LABEL)
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#define WCET_CLAMP(X, LB, UB, LABEL) PRINT_TIME(CLAMP(X,LB,UB),LABEL)
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#else
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#define DEBUG_VAL(X,D) (X)
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#define WCET_CLAMP(X, LB, UB, LABEL) PRINT_TIME(CLAMP(X,LB,UB),LABEL)
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#define DEBUG_WCET(A)
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#endif
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@ -279,10 +283,11 @@ static void prvTask31( void * pvParameters ) {
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// Actions --------------------------------------
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// Exectime: f(x) = x
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// Output: g(x) = x % 2
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uint16_t x = fuzz_short_next();
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volatile uint16_t x = fuzz_short_next();
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DEBUG_WCET(x=48940;)
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WCET_CLAMP(x, 0, 48940, TASK_31_MESSAGE)
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WCET_END({trigger_Qemu_break();})
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xTaskNotify(xTask78, x % 2, eSetValueWithOverwrite);
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xTaskNotify(xTask78, DEBUG_VAL(x % 2, 1), eSetValueWithOverwrite);
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// ---------------------------------------------
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vTaskDelayUntil( &xLastWakeTime, xFrequency );}// Wait for the next cycle.
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}
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@ -297,15 +302,15 @@ static void prvTask78( void * pvParameters ) {
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// Output: g(x,y) = y * (x % 4)
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uint16_t x = fuzz_short_next();
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int torun = 6035;
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volatile int torun = 6035;
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if (y > 0) {
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torun += 20000;
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}
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if (CHANCE_1_IN_POWOF2(x, 5)) {
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if (DEBUG_VAL(CHANCE_1_IN_POWOF2(x, 5), 1)) {
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torun += 50000;
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}
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WCET_CLAMP(torun, 0, 76035, TASK_78_MESSAGE)
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xTaskNotify(xTask400, y * (x % 4), eSetValueWithOverwrite);
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xTaskNotify(xTask400, DEBUG_VAL(y * (x % 4), 2), eSetValueWithOverwrite);
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// ---------------------------------------------
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vTaskDelayUntil( &xLastWakeTime, xFrequency );}
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}
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@ -319,11 +324,12 @@ static void prvTask400( void * pvParameters ) {
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// Exectime: f(x,y) = rng(x)*y*c or (rng(x) % 1000)
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uint32_t x = fuzz_long_next();
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int torun = 0;
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if (y == 2 && CHANCE_1_IN_POWOF2(x, 2)) {
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volatile int torun = 0;
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if (y == 2 && DEBUG_VAL(CHANCE_1_IN_POWOF2(x, 2), 1)) {
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torun = 1765;
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} else {
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torun = RNG_FROM(x) % 1000;
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DEBUG_WCET(torun=999;)
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}
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WCET_CLAMP(torun, 0, 1765, TASK_400_MESSAGE)
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// ---------------------------------------------
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@ -339,14 +345,15 @@ static void prvTask397( void * pvParameters ) {
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for( ;; ){
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// Exectime: f(x) = x
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// Output: g(x) = x % 2
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uint16_t x = fuzz_short_next();
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volatile uint16_t x = fuzz_short_next();
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DEBUG_WCET(x=5830;)
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WCET_CLAMP(x, 0, 5830, TASK_397_MESSAGE);
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xTaskNotify(xTask90, x & 0x1, eSetValueWithOverwrite);
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xTaskNotify(xTask90, DEBUG_VAL(x & 0x1, 0), eSetValueWithOverwrite);
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// 3 different activation strategies -------------
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// activate sporadically from interrupts
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ulTaskNotifyTake(pdTRUE,portMAX_DELAY);
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// ulTaskNotifyTake(pdTRUE,portMAX_DELAY);
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// activate with worst possible frequency (700us, but tick resolution is too low)
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// vTaskDelayUntil( &xLastWakeTime, xFrequency );
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vTaskDelayUntil( &xLastWakeTime, xFrequency );
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// wait pseudo random many ticks
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// vTaskDelayUntil( &xLastWakeTime, CLAMP(RNG, 1, 100) / portTICK_PERIOD_MS );
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}
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@ -361,7 +368,8 @@ static void prvTask90( void * pvParameters ) {
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// Exectime: f(x) = c + x
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// Output: g(x) = x % 4
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int y = ulTaskNotifyTake(pdFALSE, 0);
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uint16_t x = fuzz_short_next();
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volatile uint16_t x = fuzz_short_next();
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DEBUG_WCET(x=20048;)
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int torun = 0;
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if (y) {
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torun = CLAMP(x, 5000, 10000);
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@ -369,7 +377,7 @@ static void prvTask90( void * pvParameters ) {
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torun = CLAMP(x, 0, 20045);
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}
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WCET_CLAMP(torun, 0, 20045, TASK_90_MESSAGE)
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xTaskNotify(xTask1107, x % 4, eSetValueWithOverwrite);
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xTaskNotify(xTask1107, DEBUG_VAL(x % 4, 0), eSetValueWithOverwrite);
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// ---------------------------------------------
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vTaskDelayUntil( &xLastWakeTime, xFrequency );}
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}
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@ -381,7 +389,8 @@ static void prvTask1107( void * pvParameters ) {
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for( ;; ){
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// Actions --------------------------------------
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// Exectime: f(x) = c - x*y
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uint16_t x = fuzz_short_next();
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volatile uint16_t x = fuzz_short_next();
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DEBUG_WCET(x=0;)
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int torun = 76865-((int)x)*y;
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WCET_CLAMP(torun, 10000, 76865, TASK_1107_MESSAGE)
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@ -402,9 +411,10 @@ static void prvTask579( void * pvParameters ) {
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// Exectime: f(x) = x>>8 & 0x0fff
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// Output: g(x) = x % 8
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uint32_t x = fuzz_long_next();
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int torun = (x>>8) & 0x0fff;
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volatile int torun = (x>>8) & 0x0fff;
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DEBUG_WCET(torun = 0x0fff;)
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WCET_CLAMP(torun, 500, 2460, TASK_579_MESSAGE)
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xTaskNotify(xTask1009, x % 8, eSetValueWithOverwrite);
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xTaskNotify(xTask1009, DEBUG_VAL(x % 8, 0), eSetValueWithOverwrite);
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// ---------------------------------------------
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vTaskDelayUntil( &xLastWakeTime, xFrequency );}
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}
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@ -419,14 +429,15 @@ static void prvTask1009( void * pvParameters ) {
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// Output: g(x) = x % 8 == y
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uint16_t x = fuzz_short_next();
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int torun = 0;
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volatile int torun = 0;
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if (x % 8 == y) {
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torun = 40000 + x;
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} else {
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torun = CLAMP(x, 0, 40000);
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}
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DEBUG_WCET(torun = 51485;)
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WCET_CLAMP(torun, 0, 51485, TASK_1009_MESSAGE)
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xTaskNotify(xTask1129, x % 8 == y, eSetValueWithOverwrite);
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xTaskNotify(xTask1129, DEBUG_VAL(x % 8 == y, 1), eSetValueWithOverwrite);
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// ---------------------------------------------
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vTaskDelayUntil( &xLastWakeTime, xFrequency );}
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}
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@ -441,14 +452,19 @@ static void prvTask1129( void * pvParameters ) {
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// Actions --------------------------------------
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// Exectime: f(x,y) = if y && rng(x) ? c1+x : c2+x
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// Output: g(x) = y && rng(x)
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// longmax - shortmax: 69505
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// longmax - shortmax: 39505
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// most likely long case, which causes a short case in next task
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uint32_t x = (uint32_t)fuzz_short_next();
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volatile uint32_t x = (uint32_t)fuzz_short_next();
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int do_short_run = y && CHANCE_1_IN_POWOF2(x, 3);
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DEBUG_WCET(
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static char flag=0;
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if (flag++ == 0 | flag == 5 | flag == 8 | flag == 9) {x = 65529;}
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else {x = 0xffff;}
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)
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volatile int do_short_run = (y + CHANCE_1_IN_POWOF2(x, 5)) == 1; // XOR
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int torun = 0;
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if (do_short_run) {
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torun = 10000 + x;
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if (do_short_run > 0) {
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torun = 40000 + x;
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} else {
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torun = 80000 + x;
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}
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@ -465,14 +481,16 @@ static void prvTask416( void * pvParameters ) {
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for( ;; ){
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// Actions --------------------------------------
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// Exectime: f(x,y) = if y ? c1+2*x : c2-x
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// longmax - shortmax: 86955
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uint32_t x = (uint32_t)fuzz_short_next();
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// longmax - shortmax: 76955
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volatile uint32_t x = (uint32_t)fuzz_short_next();
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int y = ulTaskNotifyTake(pdFALSE, 0);
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int torun = 0;
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volatile int torun = 0;
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if (y) {
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DEBUG_WCET(x=0xffff;)
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torun = x*3;
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} else {
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torun = 40000 - CLAMP_CEILING(x, 40000);
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DEBUG_WCET(x=0;)
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torun = 50000 - CLAMP_CEILING(x, 50000);
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}
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WCET_CLAMP(torun, 10000, 126955, TASK_416_MESSAGE)
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// ---------------------------------------------
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