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
multu(uint32_t rs,uint32_t rt)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
multu1(uint32_t rs,uint32_t rt)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
multu_variants(uint32_t rs,uint32_t rt)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
main()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 }
69