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https://github.com/simple64/simple64.git
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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
#include "rsp_op.hpp"
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#include "rsp_disasm.hpp"
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#include <random>
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using namespace RSP;
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static uint64_t hash_registers(const CPUState *rsp)
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{
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uint64_t h = 0xcbf29ce484222325ull;
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auto *data = reinterpret_cast<const uint32_t *>(&rsp->cp2);
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unsigned words = sizeof(rsp->cp2) >> 2;
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for (size_t i = 0; i < words; i++)
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h = (h * 0x100000001b3ull) ^ data[i];
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return h;
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}
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static void fill_cp2_register_state(std::mt19937 &rnd, CPUState *rsp)
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{
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auto *data = reinterpret_cast<uint32_t *>(&rsp->cp2);
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unsigned words = sizeof(rsp->cp2) >> 2;
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for (unsigned i = 0; i < words; i++)
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data[i] = rnd();
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}
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static void run_vu_opcode(std::mt19937 &rnd, CPUState *rsp, unsigned instr)
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{
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fill_cp2_register_state(rnd, rsp);
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uint32_t op = instr & 63;
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uint32_t vd = (instr >> 6) & 31;
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uint32_t vs = (instr >> 11) & 31;
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uint32_t vt = (instr >> 16) & 31;
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uint32_t e = (instr >> 21) & 15;
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using VUOp = void (*)(RSP::CPUState *, unsigned vd, unsigned vs, unsigned vt, unsigned e);
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static const VUOp ops[64] = {
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RSP_VMULF, RSP_VMULU, nullptr, nullptr, RSP_VMUDL, RSP_VMUDM, RSP_VMUDN, RSP_VMUDH, RSP_VMACF, RSP_VMACU, nullptr,
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nullptr, RSP_VMADL, RSP_VMADM, RSP_VMADN, RSP_VMADH, RSP_VADD, RSP_VSUB, nullptr, RSP_VABS, RSP_VADDC, RSP_VSUBC,
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nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, RSP_VSAR, nullptr, nullptr, RSP_VLT,
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RSP_VEQ, RSP_VNE, RSP_VGE, RSP_VCL, RSP_VCH, RSP_VCR, RSP_VMRG, RSP_VAND, RSP_VNAND, RSP_VOR, RSP_VNOR,
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RSP_VXOR, RSP_VNXOR, nullptr, nullptr, RSP_VRCP, RSP_VRCPL, RSP_VRCPH, RSP_VMOV, RSP_VRSQ, RSP_VRSQL, RSP_VRSQH,
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RSP_VNOP,
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};
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auto *vuop = ops[op];
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if (!vuop)
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vuop = RSP_RESERVED;
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vuop(rsp, vd, vs, vt, e);
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uint64_t register_hash = hash_registers(rsp);
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auto disasm = disassemble(0, instr | (0x25u << 25u));
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printf("%s (%llx)\n", disasm.c_str(), static_cast<unsigned long long>(register_hash));
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}
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int main()
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{
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// Exhaustive test every single VU opcode with random input.
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std::mt19937 rnd(0xf00b4); // Fixed seed.
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CPUState state = {};
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// Sweep through every opcode at least once.
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constexpr unsigned num_opcodes = 1u << 25u;
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for (unsigned instr = 0; instr < num_opcodes; instr++)
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run_vu_opcode(rnd, &state, instr);
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// Try random opcodes some more, should hopefully hit some interesting corner cases eventually.
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constexpr unsigned num_random_opcodes = 50000000;
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for (unsigned i = 0; i < num_random_opcodes; i++)
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{
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unsigned instr = rnd() & (num_opcodes - 1);
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run_vu_opcode(rnd, &state, instr);
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}
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}
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