gcc/testsuite/gcc.dg/strlenopt-51.c

/* PR tree-optimization/77357 - strlen of constant strings not folded
   { dg-do compile }
   { dg-options "-O0 -Wall -fdump-tree-gimple" } */

#include "strlenopt.h"

#define CONCAT(x, y) x ## y
#define CAT(x, y) CONCAT (x, y)
#define FAILNAME(name, counter) \
  CAT (CAT (CAT (call_ ## name ##_on_line_, __LINE__), _), counter)

#define FAIL(name, counter) do {			\
    extern void FAILNAME (name, counter) (void);	\
    FAILNAME (name, counter)();				\
  } while (0)

/* Macro to emit a call to funcation named
     call_in_true_branch_not_eliminated_on_line_NNN()
   for each call that's expected to be eliminated.  The dg-final
   scan-tree-dump-time directive at the bottom of the test verifies
   that no such call appears in output.  */
#define ELIM(expr) \
  if (!(expr)) FAIL (in_true_branch_not_eliminated, __COUNTER__); else (void)0

#define T(s, n) ELIM (strlen (s) == n)


struct S
{
  char a1[1], a2[2], a3[3], a4[4], a5[5], a6[6], a7[7], a8[8], a9[9];
};

#define S0 ""
#define S1 "1"
#define S2 "12"
#define S3 "123"
#define S4 "1234"
#define S5 "12345"
#define S6 "123456"
#define S7 "1234567"
#define S8 "12345678"

const char a9[][9] = { S0, S1, S2, S3, S4, S5, S6, S7, S8 };

void test_elim_a9 (unsigned i)
{
  ELIM (strlen (&a9[0][i]) > 0);
  ELIM (strlen (&a9[1][i]) > 1);
  ELIM (strlen (&a9[2][i]) > 2);
  ELIM (strlen (&a9[3][i]) > 3);
  ELIM (strlen (&a9[4][i]) > 4);
  ELIM (strlen (&a9[5][i]) > 5);
  ELIM (strlen (&a9[6][i]) > 6);
  ELIM (strlen (&a9[7][i]) > 7);
  ELIM (strlen (&a9[8][i]) > 8);
}

const char a9_9[][9][9] = {
  { S0, S1, S2, S3, S4, S5, S6, S7, S8 },
  { S1, S2, S3, S4, S5, S6, S7, S8, S0 },
  { S2, S3, S4, S5, S6, S7, S8, S0, S1 },
  { S3, S4, S5, S6, S7, S8, S0, S1, S2 },
  { S4, S5, S6, S7, S8, S0, S1, S2, S3 },
  { S5, S6, S7, S8, S0, S1, S2, S3, S4 },
  { S6, S7, S8, S0, S1, S2, S3, S4, S5 },
  { S7, S8, S0, S1, S2, S3, S4, S5, S6 },
  { S8, S0, S1, S2, S3, S4, S5, S6, S7 }
};

void test_elim_a9_9 (unsigned i)
{
#undef T
#define T(I)					\
  ELIM (strlen (&a9_9[I][0][i]) > (0 + I) % 9);	\
  ELIM (strlen (&a9_9[I][1][i]) > (1 + I) % 9);	\
  ELIM (strlen (&a9_9[I][2][i]) > (2 + i) % 9);	\
  ELIM (strlen (&a9_9[I][3][i]) > (3 + I) % 9);	\
  ELIM (strlen (&a9_9[I][4][i]) > (4 + I) % 9);	\
  ELIM (strlen (&a9_9[I][5][i]) > (5 + I) % 9);	\
  ELIM (strlen (&a9_9[I][6][i]) > (6 + I) % 9);	\
  ELIM (strlen (&a9_9[I][7][i]) > (7 + I) % 9);	\
  ELIM (strlen (&a9_9[I][8][i]) > (8 + I) % 9)

  T (0); T (1); T (2); T (3); T (4); T (5); T (6); T (7); T (8);
}

/* { dg-final { scan-tree-dump-times "strlen1" 0 "gimple" } } */