All Assembly Solutions on Gang of Coders

Total of 179 Assembly Solutions

Compiling assembly in Visual Studio

Windows Visual Studio-2010 Assembly

How to write self-modifying code in x86 assembly

Assembly X86 Jit Vm Implementation Self Modifying

Intel 64, rsi and rdi registers

Assembly X86 64

Why does GCC call libc's sqrt() without using its result?

C++Gcc Assembly X86 64

What is stack frame in assembly?

Micro fusion and addressing modes

Assembly X86 Intel Cpu Architecture Iaca

Fastest way to calculate a 128-bit integer modulo a 64-bit integer

C Algorithm X86 Modulo Assembly

What does ORG Assembly Instruction do?

Assembly X86 Nasm Directive

How does an assembly instruction turn into voltage changes on the CPU?

Assembly Embedded Cpu Architecture

What does the "rep stos" x86 assembly instruction sequence do?

Assembly Language - How to do Modulo?

Assembly X86 Modulo Integer Division

What registers are preserved through a linux x86-64 function call

Linux Assembly X86 64 Calling Convention Abi

Does it make any sense to use the LFENCE instruction on x86/x86_64 processors?

Assembly X86 X86 64 Atomic Memory Barriers

What do C and Assembler actually compile to?

C++C Compiler Construction Linker Assembly

What does MOV EAX, DWORD PTR DS:[ESI] mean and what does it do?

"enter" vs "push ebp; mov ebp, esp; sub esp, imm" and "leave" vs "mov esp, ebp; pop ebp"

Assembly X86 Stack Micro Optimization Stack Frame

Using GCC to produce readable assembly?

How to Detect the Number of Physical Processors / Cores on Windows, Mac and Linux

C++Windows Macos Assembly Hyperthreading

Why is gcc allowed to speculatively load from a struct?

C Gcc Assembly X86 Compiler Optimization

Algorithm for finding the smallest power of two that's greater or equal to a given value

C++Algorithm Assembly

Stack allocation, padding, and alignment

C Gcc Assembly X86 Stack

Is it possible to include inline assembly in Go code?

Go Assembly Inline Assembly

What is the meaning of XOR in x86 assembly?

What is __i686.get_pc_thunk.bx? Why do we need this call?

C Assembly Shared Libraries Glibc

NASM Vs GAS (Practical differences)

Assembly X86 Nasm Gnu Assembler Att

Where to learn x64 assembly from?

Assembly 64 Bit Fasm

Is it possible to "decompile" a Windows .exe? Or at least view the Assembly?

Debugging Winapi Assembly Decompiling

Is there syntax highlighting for assembly in Sublime Text 2?

Text Assembly Ide Syntax Highlighting

What does `rep ret` mean?

Assembly X86 Micro Optimization Branch Prediction

Why does Java switch on contiguous ints appear to run faster with added cases?

Java Performance Assembly Compiler Construction Switch Statement

How to run a program without an operating system?

Assembly X86 Operating System Bootloader Osdev

What does multicore assembly language look like?

Assembly X86 Cpu Multicore Smp

Is 'switch' faster than 'if'?

C Performance Switch Statement Assembly Jump Table

What is a retpoline and how does it work?

Security Assembly X86 Cpu Architecture Spectre

Assembly code vs Machine code vs Object code?

Assembly Machine Code Object Code

What is exactly the base pointer and stack pointer? To what do they point?

C Assembly X86 Stack Frame Stack Pointer

Why does GCC use multiplication by a strange number in implementing integer division?

C Gcc Assembly X86 64 Integer Division

Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?

Performance Optimization Assembly X86 64 Freepascal

Protecting executable from reverse engineering?

C++C Obfuscation Assembly

Why aren't programs written in Assembly more often?

C Programming Languages Assembly

Show current assembly instruction in GDB

Why does C++ code for testing the Collatz conjecture run faster than hand-written assembly?

C++Performance Assembly Optimization X86

Is inline assembly language slower than native C++ code?

C++C Performance Assembly

The point of test %eax %eax

Assembly X86 Att

Why does GCC generate such radically different assembly for nearly the same C code?

C Gcc Assembly X86 Compiler Optimization

What's the purpose of the LEA instruction?

Assembly X86 X86 64 X86 16

What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 and x86-64

Linux Assembly X86 64 Calling Convention Abi

Can num++ be atomic for 'int num'?

C++C Multithreading Assembly Atomic

How do you use gcc to generate assembly code in Intel syntax?

Assembly Gcc X86 Intel Syntax

What is the difference between MOV and LEA?

Assembly X86 Instruction Set

Why do ARM chips have an instruction with Javascript in the name (FJCVTZS)?

Javascript Assembly Arm Instructions Floating Point-Conversion

What is the best way to set a register to zero in x86 assembly: xor, mov or and?

Performance Assembly Optimization X86 Micro Optimization

Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?

Assembly X86 X86 64 Cpu Registers Zero Extension

How are everyday machines programmed?

C Operating System Microcontroller Embedded Assembly

What is the meaning of "non temporal" memory accesses in x86

X86 Sse Assembly

How can I see the assembly code for a C++ program?

C++Assembly Disassembly

How do I achieve the theoretical maximum of 4 FLOPs per cycle?

C++Assembly X86 64 Cpu Architecture Flops

How does this milw0rm heap spraying exploit work?

Javascript X86 Exploit Assembly

What is the purpose of XORing a register with itself?

What does `dword ptr` mean?

Assembly X86 Dword Pointers

Purpose of ESI & EDI registers?

How to view the assembly behind the code using Visual C++?

Visual C++Assembly

Possible GCC bug when returning struct from a function

C Gcc Assembly X86 64 Compiler Bug

What are CFI directives in Gnu Assembler (GAS) used for?

Assembly Callstack Gnu Assembler Stack Unwinding Debug Information

What is the function of the push / pop instructions used on registers in x86 assembly?

Assembly X86 Terminology Stack Memory Stack Pointer

Quickly find whether a value is present in a C array?

C Optimization Assembly Embedded Arm

How can one see content of stack with GDB?

`testl` eax against eax?

Assembly X86 Instructions

Why does Windows64 use a different calling convention from all other OSes on x86-64?

Windows Assembly X86 64 Calling Convention Abi

What is the "FS"/"GS" register intended for?

Assembly X86 Cpu Architecture Cpu Registers Memory Segmentation

Why doesn't GCC optimize aaaaaa to (aaa)(aaa)?

Gcc Assembly Floating Point Compiler Optimization Fast Math

What is the difference between native code, machine code and assembly code?

.Net Assembly Bytecode Machine Code

How exactly does the callstack work?

Assembly Cpu Callstack Low Level Calling Convention

How to disassemble a binary executable in Linux to get the assembly code?

C++Linux Assembly Executable Disassembly

How can I build a small operating system on an old desktop computer?

C Operating System Bootstrapping Osdev Assembly

Why is x86 ugly? Why is it considered inferior when compared to others?

Assembly X86 Mips X86 64 Cpu Architecture

What's the difference between a word and byte?

Assembly Byte Cpu Architecture Terminology Word

What is the direction of stack growth in most modern systems?

Assembly Stack Callstack Abi Stack Frame

Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?

Performance Assembly Floating Point X86 Sse

What does "int 0x80" mean in assembly code?

How to write hello world in assembler under Windows?

Winapi Assembly X86 Nasm

How to break on assembly instruction at a given address in gdb?

Is it worthwile to learn assembly language?

Programming Languages Assembly Nasm

Learning assembly

Which is faster : if (bool) or if(int)?

C++Assembly Int Boolean

Difference between JE/JNE and JZ/JNZ

When is assembly faster than C?

C Performance Assembly

What is the purpose of the RBP register in x86_64 assembler?

C Assembly X86 64 Stack Pointer

Unexpected exec permission from mmap when assembly files included in the project

C Linux Assembly Mmap Dep

What is the purpose of the EBP frame pointer register?

Performance Assembly X86

Using gdb to single-step assembly code outside specified executable causes error "cannot find bounds of current function"

Linux Assembly Gdb X86 Linux Kernel

How can I multiply and divide using only bit shifting and adding?

C Assembly Bit Manipulation Division Multiplication

Why does Intel hide internal RISC core in their processors?

Assembly X86 Intel Cpu Architecture

What are .S files?

File Assembly File Extension

Why can a T* be passed in register, but a unique_ptr<T> cannot?

C++Assembly Unique Ptr Calling Convention Abi

How do I disassemble raw 16-bit x86 machine code?

Linux Assembly X86 X86 16 Mbr

How do you get assembler output from C/C++ source in gcc?

C++C Assembly Gcc Disassembly

Why is a conditional move not vulnerable to Branch Prediction Failure?

Performance Assembly Optimization Cpu Architecture Branch Prediction

What does "rep; nop;" mean in x86 assembly? Is it the same as the "pause" instruction?

Assembly X86 X86 64 Cpu Machine Code

How to remove "noise" from GCC/clang assembly output?

C++Assembly Gcc Clang Compiler Optimization

How does the stack work in assembly language?

Assembly Stack Callstack Stack Memory

Limitations of Intel Assembly Syntax Compared to AT&T

Linux Assembly X86 Att Intel Syntax

If registers are so blazingly fast, why don't we have more of them?

Performance History Cpu Registers Assembly

How to see JIT-compiled code in JVM?

Java Assembly Jvm Jit

What does @plt mean here?

Linux Assembly X86 64 Disassembly Dynamic Linking

x86_64 registers rax/eax/ax/al overwriting full register contents

Assembly X86 64 Cpu Registers Zero Extension

Why do you program in assembly?

C Performance Low Level Assembly

If statement vs if-else statement, which is faster?

C++Performance C++11 Assembly Microbenchmark

How can objdump emit intel syntax

Linux Assembly X86 64 Objdump

What are SP (stack) and LR in ARM?

Assembly Stack Arm

What are IN & OUT instructions in x86 used for?

Assembly X86 Linux Kernel

Why does GCC pad functions with NOPs?

C Assembly Gcc Memory Alignment

Enhanced REP MOVSB for memcpy

Performance Assembly X86 Cpu Architecture Memcpy

"Assembly" vs. "Assembler"

Terminology Assembly

How should I get started on writing device drivers?

C Assembly Hardware Drivers

C code loop performance [continued]

C Performance Intel Instructions Assembly

Why is the loop instruction slow? Couldn't Intel have implemented it efficiently?

Performance Assembly X86 Intel Cpu Architecture

What's the purpose of the CIL nop opcode?

Assembly Bytecode Cil

Why does adding inline assembly comments cause such radical change in GCC's generated code?

C++Gcc Assembly Optimization Inline Assembly

Go isn't linking my assembly: undefined external function

How do I compile the asm generated by GCC?

C Gcc Compiler Construction Assembly

Which variable size to use (db, dw, dd) with x86 assembly?

Variables Assembly X86

What is Intel microcode?

Linux Assembly Intel

Is there a way to insert assembly code into C?

C Inline Assembly Assembly

What does the "lock" instruction mean in x86 assembly?

C++Qt Assembly X86

Is < faster than <=?

C++C Performance Assembly Relational Operators

Why is this C++ program so incredibly fast?

C++Performance Assembly Compiler Construction

Argument order to std::min changes compiler output for floating-point

Android C++Assembly X86 Floating Point

int operators != and == when comparing to zero

C++Performance Assembly Machine Code

How to generate assembly code with clang in Intel syntax?

C++Assembly X86 Clang Intel

Why does "noreturn" function return?

C Assembly C11 Function Call Noreturn

Where is the x86-64 System V ABI documented?

Linux Assembly X86 64 Calling Convention Abi

Fastest way to do horizontal SSE vector sum (or other reduction)

Assembly Optimization Floating Point Sse Simd

Can I use Intel syntax of x86 assembly with GCC?

C Gcc Assembly X86 Inline Assembly

What is better "int 0x80" or "syscall" in 32-bit code on Linux?

Linux Assembly X86 System Calls 32 Bit

What do the brackets mean in NASM syntax for x86 asm?

Assembly X86 Nasm

To learn assembly - should I start with 32 bit or 64 bit?

Assembly X86 X86 64 Low Level

Is this "should not happen" crash an AMD Fusion CPU bug?

Assembly Crash X86 Windbg Amd Processor

How does a NOP sled work?

C Assembly Stack Buffer Overflow Nop

C++: Mysteriously huge speedup from keeping one operand in a register

C++C Performance Optimization Assembly

Why is the construction of std::optional<int> more expensive than a std::pair<int, bool>?

C++Performance Assembly X86 64 C++17

Why does using the ternary operator to return a string generate considerably different code from returning in an equivalent if/else block?

C++Assembly Optimization Clang Compiler Optimization

Why is there not a register that contains the higher bytes of EAX?

Assembly X86 Cpu Registers

Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

C++Performance Assembly X86 Compiler Optimization

What does the endbr64 instruction actually do?

Assembly X86 64 Intel Instructions

Prefetching Examples?

Gcc Optimization Assembly Prefetch

Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?

C++C Performance Assembly Rdtsc

When are x86 LFENCE, SFENCE and MFENCE instructions required?

Multithreading Assembly X86 Cpu Memory Fences

Do x86 instructions require their own encoding as well as all of their arguments to be present in memory at the same time?

Assembly X86 Paging Virtualization Kvm

x86 Assembly on a Mac

Xcode Macos X86 Assembly

GAS: Explanation of .cfi_def_cfa_offset

Assembly Callstack Gnu Assembler Dwarf

VA (Virtual Address) & RVA (Relative Virtual Address)

Assembly Linker Loader Portable Executable

What are callee and caller saved registers?

Assembly Cpu Registers Calling Convention Abi

Why don't modern compilers coalesce neighboring memory accesses?

C++Assembly Optimization Compiler Optimization

What are the names of the new X86_64 processors registers?

Assembly X86 X86 64 Cpu Registers

Why does leave do "mov esp,ebp" in x86 assembly?

How was the first C compiler written?

C Assembly Compiler Construction

How to get assembly output from building with Cargo?

Assembly Rust Rust Cargo

Performance difference between Windows and Linux using Intel compiler: looking at the assembly

C++Assembly X86 64 Icc Intel Vtune

How many CPU cycles are needed for each assembly instruction?

Performance Assembly X86 Cpu Architecture Cpu Cycles

How Do You Make An Assembler?

Permanently Change Disassembly Flavor in GDB

Linux Assembly Gdb

Efficient integer compare function

C Assembly X86 Inline Assembly

What registers to save in the ARM C calling convention?

C Assembly Arm Calling Convention Function Call

How to force GCC to assume that a floating-point expression is non-negative?

C++Gcc Assembly Floating Point Micro Optimization

What does it mean to align the stack?

C Assembly Gcc X86 Memory Alignment

Does using xor reg, reg give advantage over mov reg, 0?

Assembly X86 Micro Optimization

Assembly - JG/JNLE/JL/JNGE after CMP

Assembly X86 Eflags

Why GCC compiled C program needs .eh_frame section?

C Assembly Exception Handling X86 Elf

What happens if you use the 32-bit int 0x80 Linux ABI in 64-bit code?

Linux Assembly X86 64 System Calls Abi

what does the assembly instruction 'db' actually do?

What are the ESP and the EBP registers?

Assembly X86 Callstack Stack Frame

Do programming language compilers first translate to assembly or directly to machine code?

Assembly Gcc Compilation Compiler Construction

What is register %eiz?

Assembly X86 Gnu Assembler Objdump

Compile/run assembler in Linux?

Linux Ubuntu X86 Assembly

LEA or ADD instruction?

What is your favorite disassembler tool in Mac OS X?

Macos Assembly Disassembly Nm Otool

What is IACA and how do I use it?

C++C Performance Assembly Iaca

Do any languages / compilers utilize the x86 ENTER instruction with a nonzero nesting level?