gcc/testsuite/gcc.dg/tree-ssa/pr43491.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 #define REGISTER register
   5
   6 #if defined __arm__
   7 # define REG1 asm("r4")
   8 #elif defined __i386__
   9 # define REG1 asm("ebx")
  10 #elif defined __mips__
  11 # define REG1 asm("s0")
  12 #elif defined __x86_64__
  13 # define REG1 asm("rbp")
  14 #else
  15 # undef REGISTER
  16 # define REGISTER
  17 # define REG1
  18 #endif
  19
  20 REGISTER long data_0 REG1;
  21 long data_3;
  22
  23 long foo(long data, long v)
  24 {
  25         long i;
  26         long t, u;
  27
  28         if (data)
  29                 i = data_0 + data_3;
  30         else {
  31                 v = 2;
  32                 i = 5;
  33         }
  34         t = data_0 + data_3;
  35         u = i;
  36         return v * t * u;
  37 }
  38
  39 /* We should not eliminate global register variable when it is the RHS of
  40    a single assignment.  So the number of loads from data_0 has to match
  41    that of the number of adds (we hoist data_0 + data_3 above the
  42    if (data) and eliminate the useless copy).  */
  43
  44 /* { dg-final { scan-tree-dump-times "= data_0;" 1 "optimized" { target { arm*-*-* i?86-*-* mips*-*-* x86_64-*-* } } } } */
  45 /* { dg-final { scan-tree-dump-times " \\+ " 1 "optimized" { target { ! { arm*-*-* i?86-*-* mips*-*-* x86_64-*-* } } } } } */