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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fipa-ra -fomit-frame-pointer" } */
   3 /* { dg-additional-options "-mregparm=1" { target ia32 } } */
   4
   5 /* Testing -fipa-ra optimization option.  */
   6
   7 static int __attribute__((noinline))
   8 bar (int x)
   9 {
  10   return x + 3;
  11 }
  12
  13 int __attribute__((noinline))
  14 foo (int y)
  15 {
  16   return y + bar (y);
  17 }
  18
  19 /* Check that no registers are saved/restored. */
  20 /* { dg-final { scan-assembler-not "push"  } } */
  21 /* { dg-final { scan-assembler-not "pop"  } } */
  22
  23 /* PR61605.  If the first argument register and the return register differ, then
  24    bar leaves the first argument register intact.  That means in foo that the
  25    first argument register still contains y after bar has been called, and
  26    there's no need to copy y to a different register before the call, to be able
  27    to use it after the call.
  28    Check that the copy is absent.  */
  29 /* { dg-final { scan-assembler-not "movl" { target { ! ia32 } } } } */
  30
  31 /* Check that addition uses di (in case of no copy) or dx (in case of copy). */
  32 /* { dg-final { scan-assembler-times "addl\t%\[re\]?d\[ix\], %\[re\]?ax" 1 } } */