Viewing file:  memchr.c (2.55 KB) -rw-r--r--
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/* PR middle-end/78257 - missing memcmp optimization with constant arrays
{ dg-do compile }
{ dg-options "-O -Wall -fdump-tree-optimized" } */
typedef __INT8_TYPE__ int8_t;
typedef __INT16_TYPE__ int16_t;
typedef __INT32_TYPE__ int32_t;
typedef __SIZE_TYPE__ size_t;
extern void* memchr (const void*, int, size_t);
/* Verify that initializers for flexible array members are handled
correctly. */
struct SX
{
/* offset */
/* 0 */ int32_t n;
/* 4 */ int8_t: 1;
/* 6 */ int16_t a[];
};
_Static_assert (__builtin_offsetof (struct SX, a) == 6);
const struct SX sx =
{
0x11121314, { 0x2122, 0x3132, 0x4142, 0x5152 }
};
const char sx_rep[] =
{
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
0x11, 0x12, 0x13, 0x14, 0, 0, 0x21, 0x22, 0x31, 0x32, 0x41, 0x42, 0x51, 0x52
#else
0x14, 0x13, 0x12, 0x11, 0, 0, 0x22, 0x21, 0x32, 0x31, 0x42, 0x41, 0x52, 0x51
#endif
};
void test_find (void)
{
int n = 0, nb = (const char*)&sx.a[4] - (const char*)&sx;
const char *p = (const char*)&sx, *q = sx_rep;
if (nb != sizeof sx_rep)
__builtin_abort ();
n += p == memchr (p, q[ 0], nb);
n += p + 1 == memchr (p, q[ 1], nb);
n += p + 2 == memchr (p, q[ 2], nb);
n += p + 3 == memchr (p, q[ 3], nb);
n += p + 4 == memchr (p, q[ 4], nb);
n += p + 4 == memchr (p, q[ 5], nb);
n += p + 6 == memchr (p, q[ 6], nb);
n += p + 7 == memchr (p, q[ 7], nb);
n += p + 8 == memchr (p, q[ 8], nb);
n += p + 9 == memchr (p, q[ 9], nb);
n += p + 10 == memchr (p, q[10], nb);
n += p + 11 == memchr (p, q[11], nb);
n += p + 12 == memchr (p, q[12], nb);
n += p + 13 == memchr (p, q[13], nb);
if (n != 14)
__builtin_abort ();
}
void test_not_find (void)
{
int n = 0, nb = (const char*)&sx.a[4] - (const char*)&sx;
const char *p = (const char*)&sx, *q = sx_rep;
if (nb != sizeof sx_rep)
__builtin_abort ();
n += 0 == memchr (p, 0xff, nb);
n += 0 == memchr (p + 1, q[ 0], nb - 1);
n += 0 == memchr (p + 2, q[ 1], nb - 2);
n += 0 == memchr (p + 3, q[ 2], nb - 3);
n += 0 == memchr (p + 4, q[ 3], nb - 4);
n += 0 == memchr (p + 6, q[ 4], nb - 6);
n += 0 == memchr (p + 7, q[ 6], nb - 7);
n += 0 == memchr (p + 8, q[ 7], nb - 8);
n += 0 == memchr (p + 9, q[ 8], nb - 9);
n += 0 == memchr (p + 10, q[ 9], nb - 10);
n += 0 == memchr (p + 11, q[10], nb - 11);
n += 0 == memchr (p + 12, q[11], nb - 12);
n += 0 == memchr (p + 13, q[12], nb - 13);
n += 0 == memchr (p + 14, q[13], nb - 14);
if (n != 14)
__builtin_abort ();
}
/* { dg-final { scan-tree-dump-not "abort" "optimized" } } */
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