gcc/testsuite/gcc.target/s390/memcpy-1.c

   1 /* Make sure that short memcpy's with constant length are emitted
   2    without loop statements.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O3 -mzarch" } */
   6
   7 /* 3 MVCs */
   8 void
   9 *memcpy1(void *dest, const void *src)
  10 {
  11   return __builtin_memcpy (dest, src, 700);
  12 }
  13
  14 /* NOP */
  15 void
  16 *memcpy2(void *dest, const void *src)
  17 {
  18   return __builtin_memcpy (dest, src, 0);
  19 }
  20
  21 /* 1 MVC */
  22 void
  23 *memcpy3(void *dest, const void *src)
  24 {
  25   return __builtin_memcpy (dest, src, 256);
  26 }
  27
  28 /* 2 MVCs */
  29 void
  30 *memcpy4(void *dest, const void *src)
  31 {
  32   return __builtin_memcpy (dest, src, 512);
  33 }
  34
  35 /* 3 MVCs */
  36 void
  37 *memcpy5(void *dest, const void *src)
  38 {
  39   return __builtin_memcpy (dest, src, 768);
  40 }
  41
  42 /* Loop with 2 MVCs */
  43 void
  44 *memcpy6(void *dest, const void *src)
  45 {
  46   return __builtin_memcpy (dest, src, 1537);
  47 }
  48
  49 /* memcpy6 uses a loop - check for the two load address instructions
  50    used to increment src and dest.  */
  51 /* { dg-final { scan-assembler-times "la" 2 } } */
  52
  53 /* { dg-final { scan-assembler-times "mvc" 11 } } */