gcc/testsuite/gcc.target/i386/fuse-caller-save-rec.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fuse-caller-save -fomit-frame-pointer -fno-optimize-sibling-calls" } */
   3 /* { dg-additional-options "-mregparm=1" { target ia32 } } */
   4
   5 /* Test -fuse-caller-save optimization on self-recursive function.  */
   6
   7 static int __attribute__((noinline))
   8 bar (int x)
   9 {
  10   if (x > 4)
  11     return bar (x - 3);
  12   return 0;
  13 }
  14
  15 int __attribute__((noinline))
  16 foo (int y)
  17 {
  18   return y + bar (y);
  19 }
  20
  21 /* Check that no registers are saved/restored. */
  22 /* { dg-final { scan-assembler-not "push"  } } */
  23 /* { dg-final { scan-assembler-not "pop"  } } */
  24
  25 /* Check that addition uses dx. */
  26 /* { dg-final { scan-assembler-times "addl\t%\[re\]?dx, %\[re\]?ax" 1 } } */
  27
  28 /* Verify that bar is self-recursive.  */
  29 /* { dg-final { scan-assembler-times "call\t_?bar" 2 } } */