#include "test.h"

static void
maybe_save(jit_state_t *j, jit_gpr_t reg)
{
  if (jit_class(reg.bits) & jit_class_sav)
    jit_pushr(j, reg);
}    

static void
maybe_restore(jit_state_t *j, jit_gpr_t reg)
{
  if (jit_class(reg.bits) & jit_class_sav)
    jit_popr(j, reg);
}    

static void
run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
{
  jit_begin(j, arena_base, arena_size);

  const jit_arg_abi_t abi[] = {
    JIT_ARG_ABI_POINTER, JIT_ARG_ABI_POINTER,
    JIT_ARG_ABI_INTMAX, JIT_ARG_ABI_INTMAX
  };
  jit_arg_t args[4];
  const jit_anyreg_t regs[] = {
    { .gpr=JIT_R0 }, { .gpr=JIT_R1 },
    { .gpr=JIT_R2 }, { .gpr=JIT_V0 }
  };

  maybe_save(j, JIT_V0);
  maybe_save(j, JIT_V1);
  maybe_save(j, JIT_V2);

  jit_receive(j, 4, abi, args);
  jit_load_args(j, 4, abi, args, regs);

  jit_qmulr(j, JIT_V1, JIT_V2, JIT_R2, JIT_V0);
  jit_str(j, JIT_R0, JIT_V1);
  jit_str(j, JIT_R1, JIT_V2);

  maybe_restore(j, JIT_V2);
  maybe_restore(j, JIT_V1);
  maybe_restore(j, JIT_V0);

  jit_ret(j);

  size_t size = 0;
  void* ret = jit_end(j, &size);

  void (*f)(intmax_t*, intmax_t*, intmax_t, intmax_t) = ret;

#define QMUL(a, b, c, d) \
  do { \
    intmax_t C = 0, D = 0; f(&C, &D, a, b); ASSERT(C == c); ASSERT(D == d); \
  } while (0)
  
  QMUL(-2, -1, 2, 0);
  QMUL(0, -1, 0, 0);
  QMUL(-1, 0, 0, 0);
  QMUL(1, -1, -1, -1);
#if __WORDSIZE == 32
  QMUL(0x7ffff, 0x7ffff, 0xfff00001, 0x3f);
  QMUL(0x80000000, -2, 0, 1);
  QMUL(0x80000000, 2, 0, -1);
  QMUL(0x80000001, 3, 0x80000003, -2);
  QMUL(0x80000001, -3, 0x7ffffffd, 1);
#else
  QMUL(0x7ffffffff, 0x7ffffffff, 0xfffffff000000001, 0x3f);
  QMUL(0x8000000000000000, -2, 0, 1);
  QMUL(0x8000000000000000, 2, 0, -1);
  QMUL(0x8000000000000001, 3, 0x8000000000000003, -2);
  QMUL(0x8000000000000001, -3, 0x7ffffffffffffffd, 1);
#endif
}

int
main (int argc, char *argv[])
{
  return main_helper(argc, argv, run_test);
}