gcc/testsuite/gcc.target/powerpc/shrink-wrap-separate-0.c

   1 /* { dg-do compile { target powerpc*-*-* } } */
   2 /* { dg-options "-O2" } */
   3 /* { dg-final { scan-assembler {#before\M.*\mmflr\M} } } */
   4
   5 /* This tests if shrink-wrapping for separate components works.
   6
   7    r20 (a callee-saved register) is forced live at the start, so that we
   8    get it saved in a prologue at the start of the function.
   9    The link register only needs to be saved if x is non-zero; without
  10    separate shrink-wrapping it would however be saved in the one prologue.
  11    The test tests if the mflr insn ends up behind the prologue.  */
  12
  13 void g(void);
  14
  15 void f(int x)
  16 {
  17         register int r20 asm("20") = x;
  18         asm("#before" : : "r"(r20));
  19         if (x)
  20                 g();
  21         asm(""); // no tailcall of g
  22 }