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What is the difference between native code, machine code and assembly code?
...3 C4 04 add esp,4
return 0;
00401020 33 C0 xor eax,eax
}
00401022 5D pop ebp
00401023 C3 ret
I didn't annotate it, mostly because it is so similar to the machine code generated by the C# program. The printf() functi...
Do sealed classes really offer performance Benefits?
...
0000000d je 00000014
0000000f call 70032C33
00000014 xor edx,edx
00000016 mov dword ptr [ebp-4],edx
00000019 mov ecx,588230h
0000001e call FFEEEBC0
00000023 mov dword ptr [ebp-8],eax
00000026 mov ecx,dword ptr [ebp-8]
00...
Heap vs Binary Search Tree (BST)
...
@Yeo: Heap is better for findMin xor findMax. If you need both, then BST is better.
– Mooing Duck
Apr 9 '15 at 21:14
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How to count the number of set bits in a 32-bit integer?
... ret
unsigned test_u64(unsigned long long a) { return popcount(a); }
xor eax, eax # gcc avoids false dependencies for Intel CPUs
popcnt rax, rdi
ret
PowerPC64 gcc -O3 -std=gnu++11 emits (for the int arg version):
rldicl 3,3,0,32 # zero-extend from 32 to 64-bit
p...
Best explanation for languages without null
... What's wrong with assert(actionSheet ^ alertView)? Or can't your language XOR bools?
– cat
Jun 23 '16 at 11:28
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Approximate cost to access various caches and main memory?
...--------------------------
0.1 ns - NOP
0.3 ns - XOR, ADD, SUB
0.5 ns - CPU L1 dCACHE reference (1st introduced in late 80-ies )
0.9 ns - JMP SHORT
1 ns - speed-of-light (a photon) travel a 1 ft (30.5cm) distance -- will st...
What is the best way to stop people hacking the PHP-based highscore table of a Flash game
...couple months of messing with attackers by:
Scrambling the AES keys with XOR operations
Replacing key byte arrays with functions that calculate the key
Scattering fake key encryptions and high score postings throughout the binary.
This is all mostly a waste of time. It goes without saying, SSL i...
Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...
Consider the operation "a=b/c" x86 would implement this as
mov eax,b
xor edx,edx
div dword ptr c
mov a,eax
As an additional bonus of the div instruction edx will contain the remainder.
A RISC processor would require first loading the addresses of b and c, loading b and c from memory to ...
深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...-----------------------------
printmsg:
mov ah, 0x0e
xor bh, bh
print_loop:
lodsb
test al,al
jz done
int 0x10
jmp print_loop
done:
ret
old_IVT dw 0 ; limit of I...
Why does GCC generate such radically different assembly for nearly the same C code?
...fast_trunc_one() - register names and everything.
Notice that there are no xors in the assembly for fast_trunc_one(). That's what gave it away for me.
How so?
Step 1: sign = -sign
First, let's take a look at the sign variable. Since sign = i & 0x80000000;, there are only two possible values th...