tests/tcg/mips/user/isa/r5900/test_r5900_mult.c

   1 /*
   2  * Test R5900-specific three-operand MULT and MULT1.
   3  */
   4
   5 #include <stdio.h>
   6 #include <inttypes.h>
   7 #include <assert.h>
   8
   9 static int64_t mult(int32_t rs, int32_t rt)
  10 {
  11     int32_t rd, lo, hi;
  12     int64_t r;
  13
  14     __asm__ __volatile__ (
  15             "    mult %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 = ((int64_t)hi << 32) | (uint32_t)lo;
  21
  22     assert((int64_t)rs * rt == r);
  23     assert(rd == lo);
  24
  25     return r;
  26 }
  27
  28 static int64_t mult1(int32_t rs, int32_t rt)
  29 {
  30     int32_t rd, lo, hi;
  31     int64_t r;
  32
  33     __asm__ __volatile__ (
  34             "    mult1 %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 = ((int64_t)hi << 32) | (uint32_t)lo;
  40
  41     assert((int64_t)rs * rt == r);
  42     assert(rd == lo);
  43
  44     return r;
  45 }
  46
  47 static int64_t mult_variants(int32_t rs, int32_t rt)
  48 {
  49     int64_t rd  = mult(rs, rt);
  50     int64_t rd1 = mult1(rs, rt);
  51
  52     assert(rd == rd1);
  53
  54     return rd;
  55 }
  56
  57 static void verify_mult_negations(int32_t rs, int32_t rt, int64_t expected)
  58 {
  59     assert(mult_variants(rs, rt) == expected);
  60     assert(mult_variants(-rs, rt) == -expected);
  61     assert(mult_variants(rs, -rt) == -expected);
  62     assert(mult_variants(-rs, -rt) == expected);
  63 }
  64
  65 int main()
  66 {
  67     verify_mult_negations(17, 19, 323);
  68     verify_mult_negations(77773, 99991, 7776600043);
  69     verify_mult_negations(12207031, 305175781, 3725290219116211);
  70
  71     assert(mult_variants(-0x80000000,  0x7FFFFFFF) == -0x3FFFFFFF80000000);
  72     assert(mult_variants(-0x80000000, -0x7FFFFFFF) ==  0x3FFFFFFF80000000);
  73     assert(mult_variants(-0x80000000, -0x80000000) ==  0x4000000000000000);
  74
  75     return 0;
  76 }