diff options
Diffstat (limited to 'qtmips_machine/core.cpp')
| -rw-r--r-- | qtmips_machine/core.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/qtmips_machine/core.cpp b/qtmips_machine/core.cpp index 93b83dd..5f8321d 100644 --- a/qtmips_machine/core.cpp +++ b/qtmips_machine/core.cpp @@ -134,10 +134,14 @@ struct Core::dtExecute Core::execute(struct dtDecode dt) { if (dt.inst.opcode() == 0 && ((dt.inst.funct() == 10 && dt.val_rt != 0) || (dt.inst.funct() == 11 && dt.val_rt == 0))) regwrite = false; + std::uint32_t alu_sec = dt.val_rt; + if (dt.alusrc) + alu_sec = ((dt.inst.immediate() & 0x8000) << 16) | (dt.inst.immediate() & 0x7FFF); // Sign extend to 32bit + return { .regwrite = regwrite, .rwrite = dt.regd ? dt.inst.rd() : dt.inst.rt(), - .alu_val = alu_operate(dt.aluop, dt.val_rs, dt.alusrc ? dt.inst.immediate() : dt.val_rt, dt.inst.shamt(), regs), + .alu_val = alu_operate(dt.aluop, dt.val_rs, alu_sec, dt.inst.shamt(), regs), }; } |