What Volatile Means (and Doesn't Mean)while ((USTAT0 & TBE) == 0) { } UTXBUF0 = c; This looks like it should work. However, an optimizer might cause this code to fail. 17 Overly-Aggressive Optimization To see why optimization might ordinary object. Its state should change only when the program acts on it. Thus, the compiler’s optimizer might conclude that USTAT0’s value never changes. The compiler thinks this condition never changes Doesn't Mean) Copyright © 2024 by Ben Saks and Dan Saks 0-10 Overly-Aggressive Optimization The optimizer can eliminate the second if-statement entirely: if ((USTAT0 & TBE) == 0) { for (;;) { } }0 码力 | 32 页 | 901.80 KB | 6 月前3
Applicative: The Forgotten Functional Patternb); }; return fmap(l, lazy_call(foo, i), lazy_call(bar, i)); } 55Q: DOES THE OPTIMIZER SEE Q: DOES THE OPTIMIZER SEE THROUGH ALL THIS? THROUGH ALL THIS? A: Yes (at least in my experiments) A: Yes std::expected.. return fmap(l, lazy_call(foo, i), lazy_call(bar, i)); 63Q: DOES THE OPTIMIZER Q: DOES THE OPTIMIZER STILL STILL SEE SEE THROUGH ALL THIS? THROUGH ALL THIS? A: Again yes (at least in 0 码力 | 141 页 | 11.33 MB | 6 月前3
Cooperative C++ EvolutionEvery C program is a C++ program (still mostly true) + any C++ code can seamlessly call any C + C optimizer+linker. TypeScript: Every JS program is a TS program + any TS code can seamlessly call any JS Every C program is a C++ program (still mostly true) + any C++ code can seamlessly call any C + C optimizer+linker. TypeScript: Every JS program is a TS program + any TS code can seamlessly call any JS Every C program is a C++ program (still mostly true) + any C++ code can seamlessly call any C + C optimizer+linker. TypeScript: Every JS program is a TS program + any TS code can seamlessly call any JS0 码力 | 85 页 | 5.73 MB | 6 月前3
LLVM's Realtime Safety Revolution: Tools for Modern Mission Critical SystemsSomeday? ○ Windows support ○ Android/iOS support ○ Other architectures beyond Arm64 and x86_64Optimizer Compiler backend Linker Assembler Parser CodeGen LLVM IR LLVM IR Assembly Code Object Code 0000 2800 0080 1800 0000 ........(....... 803f 0000 0000 0000 0000 0000 0000 0000 .?..............Optimizer Compiler backend Linker Assembler Parser CodeGen LLVM IR LLVM IR Assembly Code Object Code0 码力 | 153 页 | 1.38 MB | 6 月前3
How to Build Your First C++ Automated Refactoring Tool - CppCon 2023ast_matchers::MatchFinder::MatchResult &Result) override; };Compilation in C++ 04 31 31Lexer Parser Optimizer Assembler Compilation in C++ Front End Back End 32 32a + b , <+>, <+> Lexer0 码力 | 83 页 | 6.03 MB | 6 月前3
Back to Basics: C++ Templates - Part 1copy and paste our implementation and changes types or values. ■ Depending on the compiler and optimizer, this can result in a larger binary. ■ Sometimes we overlook this, and people then refer to it0 码力 | 17 页 | 817.47 KB | 6 月前3
Just-in-Time Compilation - J F Bastien - CppCon 2020optimizes based on information about a program’s control flow during execution. The continuous optimizer itself executes in the background, as a separate low-priority thread which executes only during0 码力 | 111 页 | 3.98 MB | 6 月前3
deploying the networking TS0:11653 2021-10-06T04:01:26.490785365Z 10.244.0.119:42972 => 0.0.0.0:11653 request: {"version":"v1","query":"p 2021-10-06T04:01:26.721512358Z 10.244.0.119:42972 => 0.0.0.0:11653 accept: {"format":"application/json System interacts with outside world via WebSockets HTTP/REST Front-end selects back-end to handle query Front-end and back-end communicate with separate protocol Back-end implemented with Asio Queries serviced and server state to briefly desynchronize Consider following sequence of events 1. Server completes query processing 2. Client sends cancel 3. Client receives final chunk 4. Server receives cancel Similar0 码力 | 44 页 | 892.77 KB | 6 月前3
C++20 镶 SQL= customerid WHERE price > 5; id name item price discount_code 1 “John” “Hoodie” 10.0 “CppCon”Query for orders with input from user SELECT orders.id, name, item, price, discount_code FROM orders customer_id, arg<"price"> = 2000, arg<"item"> = "MacBook", ftsd::arg<"discount_code"> = "BIGSALE"});Query orders ftsd::prepared_statement< R"(SELECT orders.id /*:integer*/, name/*:text*/, item/*:text*/ customers ON customers.id = customerid WHERE price > ?/*:min_price:real*/;)" // > select_orders{sqldb};Query orders for (auto &row : select_orders.execute_rows({arg<"min_price"> = min_price})) { std::cout0 码力 | 46 页 | 775.02 KB | 6 月前3
Data Is All You Need for Fusionint64_t len1 = len; Arraya_q = a.query(x0, len1); Array b_q = b.query(x0, len1); Array c_q = c.query(x0, len1); Array out_2_q = out_2.query(x0, len1); vadd(a_q, b_q, len, out_1_q); int64_t len1 = len; Array a_q = a.query(x0, len1); Array b_q = b.query(x0, len1); Array c_q = c.query(x0, len1); Array out_2_q = out_2.query(x0, len1); vadd(a_q, b_q, len, out_1_q); int64_t len1 = len; Array a_q = a.query(x0, len1); Array b_q = b.query(x0, len1); Array c_q = c.query(x0, len1); Array out_2_q = out_2.query(x0, len1); vadd(a_q, b_q, len, out_1_q); 0 码力 | 151 页 | 9.90 MB | 6 月前3
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