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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-crc-details" } */
#include <stdint.h>
typedef uint8_t crc;
#define WIDTH (8 * sizeof(crc))
#define TOPBIT (1 << (WIDTH - 1))
crc
crcSlow(uint8_t message) {
crc remainder = 0;
remainder ^= (message << (WIDTH - 8));
for (uint8_t bit = 8; bit > 0; --bit) {
if (remainder & TOPBIT) {
remainder = (remainder << 1) ^ 1234;
} else {
remainder = (remainder << 1);
}
}
return (remainder);
}
/* { dg-final { scan-tree-dump "crcSlow function maybe calculates CRC and returns it." "crc"} } */
/* { dg-final { scan-tree-dump "Return size is 8" "crc"} } */
/* { dg-final { scan-tree-dump "Loop iteration number is 7" "crc"} } */
/* { dg-final { scan-tree-dump "Bit forward" "crc"} } */
/* { dg-final { scan-tree-dump "Executing \[a-zA-Z_\]\[a-zA-Z0-9_\]* = \[a-zA-Z_\]\[a-zA-Z0-9_\]* \(<<|>>\) \[0-9]+;" "crc" } } */
/* { dg-final { scan-tree-dump "crcSlow function calculates CRC." "crc"} } */
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