gcc/testsuite/gcc.dg/tree-prof/section-attr-1.c

   1 /* Checks for a bug where a function with a section attribute would prevent
   2    all later functions from being partitioned into hot and cold blocks.  */
   3 /* { dg-require-effective-target freorder } */
   4 /* { dg-options "-O2 -fno-profile-reorder-functions -freorder-blocks-and-partition -save-temps" } */
   5
   6 #define SIZE 10000
   7
   8 #define NOINLINE __attribute__((noinline)) __attribute__ ((noclone))
   9
  10 const char *sarr[SIZE];
  11 const char *buf_hot;
  12 const char *buf_cold;
  13
  14 void foo (int path);
  15
  16 __attribute__((section(".text")))
  17 int
  18 main (int argc, char *argv[])
  19 {
  20   int i;
  21   buf_hot =  "hello";
  22   buf_cold = "world";
  23   for (i = 0; i < 1000000; i++)
  24     foo (argc);
  25   return 0;
  26 }
  27
  28
  29 void NOINLINE
  30 foo (int path)
  31 {
  32   int i;
  33   if (path)
  34     {
  35       for (i = 0; i < SIZE; i++)
  36         sarr[i] = buf_hot;
  37     }
  38   else
  39     {
  40       for (i = 0; i < SIZE; i++)
  41         sarr[i] = buf_cold;
  42     }
  43 }
  44
  45 /* { dg-final-use { scan-assembler "\.section\[\t \]*\.text\.unlikely\[\\n\\r\]+\[\t \]*\.size\[\t \]*foo\.cold\.0" { target *-*-linux* *-*-gnu* } } } */