qemu/tests/tcg/mips/mipsr5900/mult.c
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   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
   9static 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
  28static 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
  47static 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
  57static 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
  65int 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}
  77