Viewing file:  memcmp-5.c (2.94 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" } */
#define A "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0"
const char a257[sizeof A - 1] = A;
const char a258[sizeof A] = A;
_Static_assert (sizeof A == 258);
_Static_assert (sizeof a257 == 257);
/* Verify that initializers longer than 256 characters (an internal limit
on the size of a buffer used to store representations in) are handled. */
void eq_256plus (void)
{
int n = 0;
n += __builtin_memcmp (a257, A, sizeof a257);
n += __builtin_memcmp (a257 + 1, A + 1, sizeof a257 - 1);
n += __builtin_memcmp (a257 + 2, A + 2, sizeof a257 - 2);
n += __builtin_memcmp (a257 + 127, A + 127, sizeof a257 - 127);
n += __builtin_memcmp (a257 + 128, A + 128, sizeof a257 - 128);
n += __builtin_memcmp (a257 + 255, A + 255, 2);
n += __builtin_memcmp (a257 + 256, A + 256, 1);
n += __builtin_memcmp (a258, A, sizeof a257);
n += __builtin_memcmp (a258 + 1, A + 1, sizeof a257 - 1);
n += __builtin_memcmp (a258 + 2, A + 2, sizeof a257 - 2);
n += __builtin_memcmp (a258 + 127, A + 127, sizeof a257 - 127);
n += __builtin_memcmp (a258 + 128, A + 128, sizeof a257 - 128);
n += __builtin_memcmp (a258 + 256, A + 256, 2);
n += __builtin_memcmp (a258 + 257, A + 257, 1);
if (n)
__builtin_abort ();
}
#define X "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" \
"1"
void lt_256plus (void)
{
int n = 0;
n += 0 > __builtin_memcmp (a257, X, sizeof a257);
n += 0 > __builtin_memcmp (a257 + 1, X + 1, sizeof a257 - 1);
n += 0 > __builtin_memcmp (a257 + 2, X + 2, sizeof a257 - 2);
n += 0 > __builtin_memcmp (a257 + 127, X + 127, sizeof a257 - 127);
n += 0 > __builtin_memcmp (a257 + 128, X + 128, sizeof a257 - 128);
n += 0 > __builtin_memcmp (a257 + 255, X + 255, 2);
n += 0 > __builtin_memcmp (a257 + 256, X + 256, 1);
n += 0 > __builtin_memcmp (a258, X, sizeof a258);
n += 0 > __builtin_memcmp (a258 + 1, X + 1, sizeof a258 - 1);
n += 0 > __builtin_memcmp (a258 + 2, X + 2, sizeof a258 - 2);
n += 0 > __builtin_memcmp (a258 + 127, X + 127, sizeof a257 - 127);
n += 0 > __builtin_memcmp (a258 + 128, X + 128, sizeof a257 - 128);
n += 0 > __builtin_memcmp (a258 + 256, X + 256, 2);
n += 0 == __builtin_memcmp (a258 + 257, X + 257, 1);
if (n != 14)
__builtin_abort ();
}
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