gcc/testsuite/gcc.dg/attr-assume_aligned-4.c

   1 /* PR middle-end/87533 - bogus assume_aligned attribute silently accepted
   2    { dg-do compile }
   3    { dg-options "-Wall" } */
   4
   5 #define A(...)  __attribute__ ((assume_aligned (__VA_ARGS__)))
   6
   7 A (1) void fv_1 (void);       /* { dg-warning ".assume_aligned. attribute ignored on a function returning .void." } */
   8
   9 A (1) int fi_1 (void);        /* { dg-warning ".assume_aligned. attribute ignored on a function returning .int." } */
  10
  11 A (-1) void* fpv_m1 (void);   /* { dg-warning ".assume_aligned. attribute argument -1 is not positive" } */
  12
  13 A (0) void* fpv_0 (void);     /* { dg-warning ".assume_aligned. attribute argument 0 is not a power of 2" } */
  14
  15 /* Alignment of 1 is fine, it just doesn't offer any benefits.  */
  16 A (1) void* fpv_1 (void);
  17
  18 A (3) void* fpv_3 (void);     /* { dg-warning ".assume_aligned. attribute argument 3 is not a power of 2" } */
  19
  20 A (16383) void* fpv_16km1 (void);     /* { dg-warning ".assume_aligned. attribute argument 16383 is not a power of 2" } */
  21 A (16384) void* fpv_16k (void);
  22 A (16385) void* fpv_16kp1 (void);    /* { dg-warning ".assume_aligned. attribute argument 16385 is not a power of 2" } */
  23
  24 A (32767) void* fpv_32km1 (void);     /* { dg-warning ".assume_aligned. attribute argument 32767 is not a power of 2" } */
  25
  26 A (4, -1) void* fpv_4_m1 (void);      /* { dg-warning ".assume_aligned. attribute argument -1 is not positive" } */
  27
  28 A (4, 0) void* fpv_4_0 (void);
  29 A (4, 1) void* fpv_4_1 (void);
  30 A (4, 2) void* fpv_4_2 (void);
  31 A (4, 3) void* fpv_4_3 (void);
  32
  33 A (4, 4) void* fpv_4_3 (void);        /* { dg-warning ".assume_aligned. attribute argument 4 is not in the range \\\[0, 3]" } */
  34
  35 A (4) void* gpv_4_3 (void);
  36 A (2) void* gpv_4_3 (void);