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FIRMWARE/COREMARK/core_state.c
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330
FIRMWARE/COREMARK/core_state.c
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/*
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Copyright 2018 Embedded Microprocessor Benchmark Consortium (EEMBC)
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Original Author: Shay Gal-on
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*/
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#include "coremark.h"
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/* local functions */
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enum CORE_STATE core_state_transition(ee_u8 **instr, ee_u32 *transition_count);
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/*
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Topic: Description
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Simple state machines like this one are used in many embedded products.
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For more complex state machines, sometimes a state transition table
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implementation is used instead, trading speed of direct coding for ease of
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maintenance.
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Since the main goal of using a state machine in CoreMark is to excercise
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the switch/if behaviour, we are using a small moore machine.
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In particular, this machine tests type of string input,
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trying to determine whether the input is a number or something else.
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(see core_state.png).
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*/
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/* Function: core_bench_state
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Benchmark function
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Go over the input twice, once direct, and once after introducing some
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corruption.
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*/
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ee_u16
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core_bench_state(ee_u32 blksize,
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ee_u8 *memblock,
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ee_s16 seed1,
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ee_s16 seed2,
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ee_s16 step,
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ee_u16 crc)
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{
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ee_u32 final_counts[NUM_CORE_STATES];
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ee_u32 track_counts[NUM_CORE_STATES];
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ee_u8 *p = memblock;
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ee_u32 i;
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#if CORE_DEBUG
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ee_printf("State Bench: %d,%d,%d,%04x\n", seed1, seed2, step, crc);
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#endif
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for (i = 0; i < NUM_CORE_STATES; i++)
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{
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final_counts[i] = track_counts[i] = 0;
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}
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/* run the state machine over the input */
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while (*p != 0)
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{
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enum CORE_STATE fstate = core_state_transition(&p, track_counts);
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final_counts[fstate]++;
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#if CORE_DEBUG
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ee_printf("%d,", fstate);
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}
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ee_printf("\n");
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#else
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}
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#endif
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p = memblock;
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while (p < (memblock + blksize))
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{ /* insert some corruption */
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if (*p != ',')
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*p ^= (ee_u8)seed1;
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p += step;
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}
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p = memblock;
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/* run the state machine over the input again */
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while (*p != 0)
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{
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enum CORE_STATE fstate = core_state_transition(&p, track_counts);
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final_counts[fstate]++;
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#if CORE_DEBUG
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ee_printf("%d,", fstate);
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}
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ee_printf("\n");
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#else
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}
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#endif
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p = memblock;
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while (p < (memblock + blksize))
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{ /* undo corruption is seed1 and seed2 are equal */
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if (*p != ',')
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*p ^= (ee_u8)seed2;
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p += step;
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}
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/* end timing */
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for (i = 0; i < NUM_CORE_STATES; i++)
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{
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crc = crcu32(final_counts[i], crc);
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crc = crcu32(track_counts[i], crc);
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}
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return crc;
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}
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/* Default initialization patterns */
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static ee_u8 *intpat[4]
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= { (ee_u8 *)"5012", (ee_u8 *)"1234", (ee_u8 *)"-874", (ee_u8 *)"+122" };
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static ee_u8 *floatpat[4] = { (ee_u8 *)"35.54400",
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(ee_u8 *)".1234500",
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(ee_u8 *)"-110.700",
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(ee_u8 *)"+0.64400" };
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static ee_u8 *scipat[4] = { (ee_u8 *)"5.500e+3",
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(ee_u8 *)"-.123e-2",
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(ee_u8 *)"-87e+832",
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(ee_u8 *)"+0.6e-12" };
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static ee_u8 *errpat[4] = { (ee_u8 *)"T0.3e-1F",
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(ee_u8 *)"-T.T++Tq",
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(ee_u8 *)"1T3.4e4z",
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(ee_u8 *)"34.0e-T^" };
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/* Function: core_init_state
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Initialize the input data for the state machine.
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Populate the input with several predetermined strings, interspersed.
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Actual patterns chosen depend on the seed parameter.
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Note:
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The seed parameter MUST be supplied from a source that cannot be
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determined at compile time
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*/
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void
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core_init_state(ee_u32 size, ee_s16 seed, ee_u8 *p)
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{
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ee_u32 total = 0, next = 0, i;
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ee_u8 *buf = 0;
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#if CORE_DEBUG
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ee_u8 *start = p;
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ee_printf("State: %d,%d\n", size, seed);
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#endif
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size--;
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next = 0;
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while ((total + next + 1) < size)
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{
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if (next > 0)
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{
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for (i = 0; i < next; i++)
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*(p + total + i) = buf[i];
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*(p + total + i) = ',';
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total += next + 1;
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}
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seed++;
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switch (seed & 0x7)
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{
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case 0: /* int */
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case 1: /* int */
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case 2: /* int */
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buf = intpat[(seed >> 3) & 0x3];
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next = 4;
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break;
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case 3: /* float */
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case 4: /* float */
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buf = floatpat[(seed >> 3) & 0x3];
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next = 8;
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break;
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case 5: /* scientific */
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case 6: /* scientific */
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buf = scipat[(seed >> 3) & 0x3];
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next = 8;
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break;
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case 7: /* invalid */
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buf = errpat[(seed >> 3) & 0x3];
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next = 8;
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break;
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default: /* Never happen, just to make some compilers happy */
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break;
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}
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}
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size++;
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while (total < size)
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{ /* fill the rest with 0 */
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*(p + total) = 0;
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total++;
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}
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#if CORE_DEBUG
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ee_printf("State Input: %s\n", start);
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#endif
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}
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static ee_u8
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ee_isdigit(ee_u8 c)
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{
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ee_u8 retval;
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retval = ((c >= '0') & (c <= '9')) ? 1 : 0;
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return retval;
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}
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/* Function: core_state_transition
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Actual state machine.
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The state machine will continue scanning until either:
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1 - an invalid input is detected.
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2 - a valid number has been detected.
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The input pointer is updated to point to the end of the token, and the
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end state is returned (either specific format determined or invalid).
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*/
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enum CORE_STATE
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core_state_transition(ee_u8 **instr, ee_u32 *transition_count)
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{
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ee_u8 * str = *instr;
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ee_u8 NEXT_SYMBOL;
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enum CORE_STATE state = CORE_START;
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for (; *str && state != CORE_INVALID; str++)
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{
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NEXT_SYMBOL = *str;
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if (NEXT_SYMBOL == ',') /* end of this input */
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{
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str++;
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break;
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}
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switch (state)
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{
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case CORE_START:
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if (ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_INT;
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}
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else if (NEXT_SYMBOL == '+' || NEXT_SYMBOL == '-')
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{
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state = CORE_S1;
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}
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else if (NEXT_SYMBOL == '.')
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{
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state = CORE_FLOAT;
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}
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else
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{
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state = CORE_INVALID;
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transition_count[CORE_INVALID]++;
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}
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transition_count[CORE_START]++;
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break;
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case CORE_S1:
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if (ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_INT;
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transition_count[CORE_S1]++;
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}
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else if (NEXT_SYMBOL == '.')
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{
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state = CORE_FLOAT;
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transition_count[CORE_S1]++;
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}
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else
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{
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state = CORE_INVALID;
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transition_count[CORE_S1]++;
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}
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break;
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case CORE_INT:
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if (NEXT_SYMBOL == '.')
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{
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state = CORE_FLOAT;
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transition_count[CORE_INT]++;
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}
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else if (!ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_INVALID;
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transition_count[CORE_INT]++;
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}
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break;
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case CORE_FLOAT:
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if (NEXT_SYMBOL == 'E' || NEXT_SYMBOL == 'e')
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{
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state = CORE_S2;
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transition_count[CORE_FLOAT]++;
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}
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else if (!ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_INVALID;
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transition_count[CORE_FLOAT]++;
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}
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break;
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case CORE_S2:
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if (NEXT_SYMBOL == '+' || NEXT_SYMBOL == '-')
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{
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state = CORE_EXPONENT;
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transition_count[CORE_S2]++;
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}
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else
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{
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state = CORE_INVALID;
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transition_count[CORE_S2]++;
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}
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break;
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case CORE_EXPONENT:
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if (ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_SCIENTIFIC;
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transition_count[CORE_EXPONENT]++;
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}
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else
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{
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state = CORE_INVALID;
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transition_count[CORE_EXPONENT]++;
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}
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break;
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case CORE_SCIENTIFIC:
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if (!ee_isdigit(NEXT_SYMBOL))
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{
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state = CORE_INVALID;
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transition_count[CORE_INVALID]++;
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}
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break;
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default:
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break;
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}
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}
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*instr = str;
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return state;
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}
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