| 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 | } |