gcc/testsuite/gcc.target/mips/mips32-dsp-accinit-2.c

   1 /* { dg-options "-mdspr2 -mgp32 -mtune=4kp" } */
   2 /* References to RESULT within the loop need to have a higher frequency than
   3    references to RESULT outside the loop, otherwise there is no reason
   4    to prefer multiply/accumulator registers over GPRs.  */
   5 /* { dg-skip-if "requires register frequencies" { *-*-* } { "-O0" "-Os" } { "" } } */
   6
   7 /* Check that the zero-initialization of the accumulator feeding into
   8    the madd is done by means of an mthi & mtlo pair instead of a
   9    "mult $0,$0" instruction.  */
  10
  11 NOMIPS16 long long f (int n, int *v, int m)
  12 {
  13   long long result = 0;
  14   int i;
  15
  16   for (i = 0; i < n; i++)
  17     result = __builtin_mips_madd (result, v[i], m);
  18   return result;
  19 }
  20
  21 /* { dg-final { scan-assembler-not "mult\t\[^\n\]*\\\$0" } } */
  22 /* { dg-final { scan-assembler "\tmthi\t" } } */
  23 /* { dg-final { scan-assembler "\tmtlo\t" } } */