gcc/testsuite/gcc.target/riscv/xtheadbb-strcmp.c

/* { dg-do compile } */
/* { dg-options "-minline-strcmp -minline-strncmp -march=rv32gc_xtheadbb" { target { rv32 } } } */
/* { dg-options "-minline-strcmp -minline-strncmp -march=rv64gc_xtheadbb" { target { rv64 } } } */
/* { dg-skip-if "" { *-*-* } { "-O0" "-Os" "-Og" "-Oz" } } */

typedef long unsigned int size_t;

/* Emits 8+1 th.tstnbz instructions.  */

int
my_str_cmp (const char *s1, const char *s2)
{
  s1 = __builtin_assume_aligned (s1, 4096);
  s2 = __builtin_assume_aligned (s2, 4096);
  return __builtin_strcmp (s1, s2);
}

/* 8+1 because the backend does not know the size of "foo".  */

int
my_str_cmp_const (const char *s1)
{
  s1 = __builtin_assume_aligned (s1, 4096);
  return __builtin_strcmp (s1, "foo");
}

/* Emits 6+1 th.tstnbz instructions.  */

int
my_strn_cmp (const char *s1, const char *s2)
{
  s1 = __builtin_assume_aligned (s1, 4096);
  s2 = __builtin_assume_aligned (s2, 4096);
  return __builtin_strncmp (s1, s2, 42);
}

/* Note expanded because the backend does not know the size of "foo".  */

int
my_strn_cmp_const (const char *s1, size_t n)
{
  s1 = __builtin_assume_aligned (s1, 4096);
  return __builtin_strncmp (s1, "foo", n);
}

/* Emits 6+1 th.tstnbz instructions.  */

int
my_strn_cmp_bounded (const char *s1, const char *s2)
{
  s1 = __builtin_assume_aligned (s1, 4096);
  s2 = __builtin_assume_aligned (s2, 4096);
  return __builtin_strncmp (s1, s2, 42);
}

/* { dg-final { scan-assembler-times "th.tstnbz\t" 32 { target { rv64 } } } } */
/* { dg-final { scan-assembler-times "th.tstnbz\t" 58 { target { rv32 } } } } */