Added FIXME messages for mulh

src/cpu/rv32cpu.c

@@ -371,6 +371,7 @@ static void cpu_execute(rv32_cpu_t* cpu, instruction_t* instruction)
 							break;
 						case FUNC7_MULH:
 							// MULtiplication High (32 high bits) (signed * signed)
+							// FIXME: This is wrong, we should sign extend the int64_t i guess
 							uint64_t mulh_result = (uint64_t) (((int64_t) cpu->regs.x[instruction->rs1]) * ((int64_t) cpu->regs.x[instruction->rs2]));
 							cpu->regs.x[instruction->rd] = (uint32_t) (mulh_result >> 32);
 							break;
@@ -392,6 +393,7 @@ static void cpu_execute(rv32_cpu_t* cpu, instruction_t* instruction)
 							break;
 						case FUNC7_MULHSU:
 							// MULtiplication High (32 high bits) (signed * unsigned)
+							// FIXME: This is wrong, we should sign extend the int64_t i guess
 							uint64_t mulhsu_result = (uint64_t) (((int64_t) cpu->regs.x[instruction->rs1]) * ((uint64_t) cpu->regs.x[instruction->rs2]));
 							cpu->regs.x[instruction->rd] = (uint32_t) (mulhsu_result >> 32);
 							break;