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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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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...
How do BitTorrent magnet links work?
...a more complicated protocol used by Azureus.
3 The distance is measured by XOR.
Further Reading
BEP-3: The BitTorrent Protocol Specification
BEP-52: The BitTorrent Protocol Specification v2
BEP-5: DHT Protocol
BEP-9: Extension for Peers to Send Metadata Files
BEP-10: Extension Protocol
BEP-11: Pe...
Heap vs Binary Search Tree (BST)
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@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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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...
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...
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...
What does multicore assembly language look like?
...it_len, %ecx
mov $init, %esi
mov 0x1000, %edi
rep movsb
.code16
init:
xor %ax, %ax
mov %ax, %ds
/* Do stuff. */
hlt
.equ init_len, . - init
Using a linker script is another possibility.
The delay loops are an annoying part to get working: there is no super simple way to do such sl...
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...