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How do I identify the instruction stored LC-3


How do I identify the instruction stored LC-3

By : user2185664
Date : November 22 2020, 04:01 AM
I wish this help you The only change in the table is at address x3406. That tells us it was a store instruction as no other is capable of writing into memory.
The available store instructions are ST, STI and STR. ST uses a 9 bit signed offset from PC which is given as x3010 in the question and is therefore out of range. STI could work but we are not provided with a memory location usable for the indirect address. That leaves STR for which the encoding allows for a 6 bit offset so to make the address x3406 we need a base from x33E6 to x3427 which leaves only a single possibility: R4 for which the offset is 6.
code :


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Uniquely identify instruction in LLVM

Uniquely identify instruction in LLVM


By : Runi Ellingsgaard
Date : March 29 2020, 07:55 AM
seems to work fine What do you mean by "execute" it?
If you execute it in the interpreter (via lli), then yes, each LLVM instruction is a unique Value*. If you compile it down to machine code and execute it, you can use debug info to correlate between the LLVM instruction and the machine code generated from it. It's trickier, but doable. Some complications like multiple machine code instrs generated from the same LLVM instruction, etc.
What will be stored in the instruction pointer during a jmp instruction in x64 assembly?

What will be stored in the instruction pointer during a jmp instruction in x64 assembly?


By : Andrei Ciomîrtan
Date : March 29 2020, 07:55 AM
wish of those help Consider a simple jump instruction (jmp) in assembly, where destination is a pre-defined label. , I found the passage you're talking about:
code :
00010000:  EB 01 CC 90
loc_10000:
    jmp loc_10003  ; EB 01
    int3           ; CC
loc_10003:
    nop            ; 90
00010000:  E9 01 00 00 00 CC 90
loc_10000:
    jmp loc_10006  ; E9 01 00 00 00
    int3           ; CC
loc_10006:
    nop            ; 90
00010000:  EB 02 EB 00 CC EB FD EB FB
loc_10000:
    jmp loc_10004  ; EB 02
    jmp loc_10004  ; EB 00
loc_10004:
    int3           ; CC
    jmp loc_10004  ; EB FD   (FD == -3)
    jmp loc_10004  ; EB FB   (FB == -5)
How to uniquely identify an instruction in LLVM Pass?

How to uniquely identify an instruction in LLVM Pass?


By : Chen Song
Date : March 29 2020, 07:55 AM
I wish this helpful for you I take it you perform counting on runtime, and in the pass you are just inserting code that performs that counting near call instructions you are interested in. In this case Instruction pointer should work just fine. The pointer would not change if you move an Instruction around, it can only become invalid if you delete Instruction.
To convert a pointer into an integer use static_cast(i).
Identify esolang with two alternating instruction wheels

Identify esolang with two alternating instruction wheels


By : Martin Lee
Date : March 29 2020, 07:55 AM
it should still fix some issue This sounds a lot like you're remembering Whirl.
How to identify any type of instruction in LLVM/C++?

How to identify any type of instruction in LLVM/C++?


By : Honesty
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can see here
Use
code :
if (llvm::isa <llvm::LoadInst> (I))
if (!strncmp(I.getOpcodeName(), "add", 4))
if (I.getOpcode == llvm::Add)
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