gcc/testsuite/gcc.target/i386/pr17692.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -mfpmath=sse -msse2" } */
   3
   4 /* The fact that t1 and t2 are uninitialized is critical.  With them
   5    uninitialized, the register allocator is free to put them in the same
   6    hard register, which results in
   7
   8         xmm0 = xmm0 >= xmm0 ? xmm0 : xmm0
   9
  10    Which is of course a nop, but one for which we would ICE splitting the
  11    pattern.  */
  12
  13 double out;
  14
  15 static void foo(void)
  16 {
  17     double t1, t2, t3, t4;
  18
  19     t4 = t1 >= t2 ? t1 : t2;
  20     t4 = t4 >= t3 ? t4 : t3;
  21     out = t4;
  22 }