tests/tcg/mips/user/isa/r5900/test_r5900_multu.c

   1 /*
   2  * Test R5900-specific three-operand MULTU and MULTU1.
   3  */
   4
   5 #include <stdio.h>
   6 #include <inttypes.h>
   7 #include <assert.h>
   8
   9 static uint64_t multu(uint32_t rs, uint32_t rt)
  10 {
  11     uint32_t rd, lo, hi;
  12     uint64_t r;
  13
  14     __asm__ __volatile__ (
  15             "    multu %0, %3, %4\n"
  16             "    mflo %1\n"
  17             "    mfhi %2\n"
  18             : "=r" (rd), "=r" (lo), "=r" (hi)
  19             : "r" (rs), "r" (rt));
  20     r = ((uint64_t)hi << 32) | (uint32_t)lo;
  21
  22     assert((uint64_t)rs * rt == r);
  23     assert(rd == lo);
  24
  25     return r;
  26 }
  27
  28 static uint64_t multu1(uint32_t rs, uint32_t rt)
  29 {
  30     uint32_t rd, lo, hi;
  31     uint64_t r;
  32
  33     __asm__ __volatile__ (
  34             "    multu1 %0, %3, %4\n"
  35             "    mflo1 %1\n"
  36             "    mfhi1 %2\n"
  37             : "=r" (rd), "=r" (lo), "=r" (hi)
  38             : "r" (rs), "r" (rt));
  39     r = ((uint64_t)hi << 32) | (uint32_t)lo;
  40
  41     assert((uint64_t)rs * rt == r);
  42     assert(rd == lo);
  43
  44     return r;
  45 }
  46
  47 static uint64_t multu_variants(uint32_t rs, uint32_t rt)
  48 {
  49     uint64_t rd  = multu(rs, rt);
  50     uint64_t rd1 = multu1(rs, rt);
  51
  52     assert(rd == rd1);
  53
  54     return rd;
  55 }
  56
  57 int main()
  58 {
  59     assert(multu_variants(17, 19) == 323);
  60     assert(multu_variants(77773, 99991) == 7776600043);
  61     assert(multu_variants(12207031, 305175781) == 3725290219116211);
  62
  63     assert(multu_variants(0x80000000U, 0x7FFFFFFF) == 0x3FFFFFFF80000000);
  64     assert(multu_variants(0x80000000U, 0x80000000U) ==  0x4000000000000000);
  65     assert(multu_variants(0xFFFFFFFFU, 0xFFFFFFFFU) ==  0xFFFFFFFE00000001U);
  66
  67     return 0;
  68 }