gcc/testsuite/gcc.target/m68k/pr36134.c

   1 /* pr36134.c
   2
   3    This test ensures that the shorter LEA instruction is used in preference
   4    to the longer ADD instruction.
   5
   6    This preference is applicable to ColdFire only.  On CPU32, we can
   7    use a sequence of two ADDQ instructions, which is faster than the
   8    LEA instruction.  */
   9
  10 /* { dg-do compile }  */
  11 /* { dg-skip-if "" { *-*-* } { "-mcpu=*" } { "-mcpu=5208" } } */
  12 /* { dg-options "-O2 -mcpu=5208" }  */
  13 /* { dg-final { scan-assembler "lea" } } */
  14 /* { dg-final { scan-assembler-not "add" } } */
  15
  16 int *a, *b;
  17
  18 void
  19 f ()
  20 {
  21   while (a > b)
  22     {
  23       *a++ = *b++;
  24       *a++ = *b++;
  25       *a++ = *b++;
  26       *a++ = *b++;
  27     }
  28 }