gcc/testsuite/gcc.dg/ipa/pr64307.c

   1 /* { dg-do compile { target c99_runtime } } */
   2 /* { dg-options "-O0 -fipa-icf -fdump-ipa-icf"  } */
   3
   4 #include <complex.h>
   5
   6 typedef _Complex float COMPLEX_FLOAT;
   7
   8 __attribute__ ((noinline))
   9 static float real_part(COMPLEX_FLOAT a)
  10 {
  11   return *(float*)(&a);
  12 }
  13
  14 __attribute__ ((noinline))
  15 static float real_part_2(COMPLEX_FLOAT a)
  16 {
  17   return ((float*)(&a))[0];
  18 }
  19
  20 int main()
  21 {
  22   COMPLEX_FLOAT f = 1.0f + _Complex_I;
  23
  24   float r1 = real_part(f);
  25   float r2 = real_part_2(f);
  26
  27   return r1 - r2;
  28 }
  29
  30 /* { dg-final { scan-ipa-dump "Semantic equality hit:real_part->real_part_2" "icf"  } } */
  31 /* { dg-final { scan-ipa-dump "Equal symbols: 1" "icf"  } } */