Viewing file:  memcmp-4.c (2.1 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 int memcmp (const void*, const void*, size_t);
/* Verify that initializers for flexible array members are handled
correctly. */
struct Si16_x
{
int16_t n, a[];
};
const struct Si16_x si16_4 =
{
0x1112, { 0x2122, 0x3132, 0x4142 }
};
const char si16_4_rep[] =
{
0x12, 0x11, 0x22, 0x21, 0x32, 0x31, 0x42, 0x41
};
void eq_si16_x (void)
{
int n = 0, b = sizeof si16_4_rep;
const char *p = (const char*)&si16_4, *q = si16_4_rep;
n += memcmp (p, q, b);
n += memcmp (p + 1, q + 1, b - 1);
n += memcmp (p + 2, q + 2, b - 2);
n += memcmp (p + 3, q + 3, b - 3);
n += memcmp (p + 4, q + 4, b - 4);
n += memcmp (p + 5, q + 5, b - 5);
n += memcmp (p + 6, q + 6, b - 6);
n += memcmp (p + 7, q + 7, b - 7);
n += memcmp (p + 8, q + 8, b - 8);
p = (const char*)&si16_4.n;
n += memcmp (p, q, b);
n += memcmp (p + 1, q + 1, b - 1);
n += memcmp (p + 2, q + 2, b - 2);
n += memcmp (p + 3, q + 3, b - 3);
n += memcmp (p + 4, q + 4, b - 4);
n += memcmp (p + 5, q + 5, b - 5);
n += memcmp (p + 6, q + 6, b - 6);
n += memcmp (p + 7, q + 7, b - 7);
n += memcmp (p + 8, q + 8, b - 8);
p = (const char*)si16_4.a;
q = si16_4_rep + 2;
n += memcmp (p, q, b - 2);
n += memcmp (p + 1, q + 1, b - 3);
n += memcmp (p + 2, q + 2, b - 4);
n += memcmp (p + 3, q + 3, b - 5);
n += memcmp (p + 4, q + 4, b - 6);
n += memcmp (p + 5, q + 5, b - 7);
n += memcmp (p + 6, q + 6, b - 8);
p = (const char*)&si16_4.a[1];
q = si16_4_rep + 4;
n += memcmp (p, q, b - 4);
n += memcmp (p + 1, q + 1, b - 5);
n += memcmp (p + 2, q + 2, b - 6);
n += memcmp (p + 3, q + 3, b - 7);
n += memcmp (p + 4, q + 4, b - 8);
if (n != 0)
__builtin_abort ();
}
/* { dg-final { scan-tree-dump-not "abort" "optimized" } } */
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