View absl_flat_hash_map_latency.txt
// Abseil absl::flat_hash_map | |
// Analysis of the critical path for perfectly predicted load hit. | |
// https://godbolt.org/z/P_ksaa | |
// | |
// x86_64 | |
// Instruction latencies have been entirely ignored. | |
# rdi = desired key | |
mov rax, qword ptr [rip + kHashSeed] # [a00] rax = per-process seed (with entropy) | |
add rax, rdi # [a01] rax = hash so far |
View bit_cast.h
#include <string.h> | |
#if defined(__has_attribute) | |
#if __has_attribute(always_inline) | |
#define ALWAYS_INLINE __attribute__((always_inline)) | |
#endif | |
#endif | |
#if defined(_MSC_VER) | |
// To reduce debug build overhead: |
View resource_table.cc
#include <xmmintrin.h> | |
#include <stdint.h> | |
struct ResourceTable8 | |
{ | |
uint64_t type_bits_; | |
uintptr_t elements_[8]; | |
inline uint64_t mask_for_type(uint8_t type) | |
{ |
View env.cmd
@echo off | |
rem = """ | |
rem This is a hybrid batch and Python script. The batch (right here) invokes | |
rem the Python script and treats its standard output as a list of environment | |
rem variables to set in the current environment. | |
rem The -x argument causes the Python interpreter to ignore the first line. | |
rem The -S argument disables the implicit 'site' package import (speed go fast). | |
FOR /F "tokens=1,2 delims==" %%v IN ('python -x -S "%~f0" %*') DO SET %%v=%%w | |
GOTO :eof | |
""" |
View workerpool.py
from __future__ import absolute_import | |
import sys | |
import threading | |
import collections | |
class WorkerPool(object): | |
"""A thread pool that processes items from an unbounded work queue, for | |
simple multi-producer, multi-consumer processes. |
View Microsoft C++.sublime-build
{ | |
"shell_cmd": "\"%VS120COMNTOOLS%\\..\\..\\VC\\vcvarsall.bat\" amd64 && cl /nologo \"$file\"", | |
"file_regex": "^(.*?)\\(([0-9+])(?:,([0-9+]))?\\)\\s+:\\s+(.*)$", | |
"working_dir": "${file_path}", | |
"selector": "source.c, source.c++" | |
} |
View simultaneous_initiation.py
import socket | |
create_socket = lambda: socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP) | |
target_port = 49400 # Any port in the ephemeral port range that no process on your machine is using. | |
port = 0 | |
# Create and bind sockets, working our way through the ephemeral port space, until we get close to our target. | |
while not (target_port - 5 < port < target_port): | |
sock = create_socket() | |
sock.bind(('127.0.0.1', 0)) |
View plaintive_function.cc
// Because it was possible to implement std::move and std::forward<T> as library | |
// functions, so that's what happened. Now this header is everywhere. This is | |
// 2,800 lines of kitchen sink for me. | |
#include <utility> | |
// C++ has half-decent pattern matching, but only on types. If only some of this | |
// energy could be thrown at language constructs like `switch'. | |
// | |
// Oh, right, and this relies on partial specialization, which only works on | |
// classes. So you get these pointless classes that contain a single typedef. |
View inlined.h
#ifndef INLINED_OBJECT_H | |
#define INLINED_OBJECT_H | |
#include <string.h> | |
template <typename T, size_t Size> | |
class inlined | |
{ | |
public: | |
inlined(); |
View msvcrt_heap_exc.cc
#include <malloc.h> | |
#include <windows.h> | |
static HANDLE FindCrtHeap() | |
{ | |
// Pick a block that we know is in the CRT heap. | |
// | |
_HEAPINFO crtEntry = {}; | |
if (_HEAPOK != _heapwalk(&crtEntry)) |
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