gcc/testsuite/gcc.target/arc/mulsi3_highpart-2.c

   1 /* { dg-do run } */
   2 /* { dg-skip-if "ARC700 always has mpy option on" { arc700 } } */
   3 /* { dg-skip-if "ARC600 doesn't have mpy instruction" { arc6xx } } */
   4 /* { dg-options "-O2 -mmpy-option=0 -w" } */
   5
   6 #include <stdlib.h>
   7
   8 /* Hide value propagation from the optimizers.  */
   9 static int
  10 id (int i)
  11 {
  12   asm ("": "+r" (i));
  13   return i;
  14 }
  15
  16 static int
  17 mulhigh (unsigned a, unsigned b)
  18 {
  19   return (unsigned long long) a * b >> 32;
  20 }
  21
  22 int
  23 main (void)
  24 {
  25   if (mulhigh (id (0x12345678), id (0x90abcdef)) != 0xa49a83e)
  26     abort ();
  27   return 0;
  28 }
  29
  30 /* { dg-final { scan-assembler-not "mpyhu\[ \t\]" } } */
  31 /* { dg-final { scan-assembler-not "@__muldi3" } } */
  32 /* { dg-final { scan-assembler "@__umulsi3_highpart" } } */