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/* { dg-do run } */
/* { dg-options "-fdump-tree-crc-details" } */
/* { dg-skip-if "" { *-*-* } { "-O0" "-O1" "-g" "-Os" "-funroll-loops" "-fpeel-loops" "-flto" } } */
/* { dg-require-effective-target int32plus } */
//Test from roms/u-boot-sam460ex/drivers/mtd/ubi/crc32.c
#include <stdint.h>
#include <stdlib.h>
typedef uint8_t u8;
typedef uint32_t u32;
#define CRCPOLY_LE 0xedb88320
__attribute__ ((noinline,optimize(0)))
u32 crc32_le_O0 (u32 crc, unsigned char const *p, size_t len)
{
int i;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
return crc;
}
u32 crc32_le (u32 crc, unsigned char const *p, size_t len)
{
int i;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
return crc;
}
int main ()
{
u32 crc = 0x0D800D80;
unsigned char st[2] = {'H','i'};
for (unsigned char i = 0; i < 255; i++)
{
st[0] = i;
u32 res1 = crc32_le_O0 (crc, st, 2);
u32 res2 = crc32_le (crc, st, 2);
if (res1 != res2)
__builtin_abort ();
crc = res1;
}
__builtin_exit (0);
}
/* { dg-final { scan-tree-dump "function maybe contains CRC calculation." "crc" } } */
/* { dg-final { scan-tree-dump "Loop iteration number is 7" "crc"} } */
/* { dg-final { scan-tree-dump "Bit reversed" "crc"} } */
/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code." 0 "crc"} } */
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