Created
November 21, 2020 04:47
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DecodeCode.c
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| #include "DecodeCode.h" | |
| mipsinstruction decode(int value) | |
| { | |
| mipsinstruction instr; | |
| unsigned int v = (unsigned int) value; | |
| instr.funct = v & 0b111111; | |
| instr.immediate = value & 0b1111111111111111; | |
| unsigned short is_signed = instr.immediate >> 15; | |
| if (is_signed){ | |
| instr.immediate &= 0b01111111111111111; | |
| instr.immediate ^= 0b01111111111111111; | |
| instr.immediate++; | |
| instr.immediate = 0 - instr.immediate; | |
| } | |
| instr.rd = v >> 11 & 0b11111; | |
| instr.rt = v >> 16 & 0b11111; | |
| instr.rs = v >> 21 & 0b11111; | |
| instr.opcode = v >> 26 & 0b111111; | |
| return instr; | |
| } | |
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