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All Compiler Optimization Solutions on Gang of Coders
Total of 56 Compiler Optimization Solutions
Java program runs slower when code that is never executed is commented out
Java
Recursion
Compiler Optimization
Understanding the as-if rule, "the program was executed as written"
C++
Compiler Optimization
How to compile Tensorflow with SSE4.2 and AVX instructions?
Tensorflow
X86
Compiler Optimization
Simd
Compiler Options
Optimize in CMake by default
C++
Cmake
Compiler Optimization
Why is gcc allowed to speculatively load from a struct?
C
Gcc
Assembly
X86
Compiler Optimization
Why is Clang optimizing this code out?
C++
Clang
Compiler Optimization
Swift Beta performance: sorting arrays
Swift
Performance
Sorting
Xcode6
Compiler Optimization
What is &&& operation in C
C++
C
Operators
Compiler Optimization
Gcc Warning
How to see which flags -march=native will activate?
Gcc
G++
Compiler Optimization
Compiler Flags
Why can lambdas be better optimized by the compiler than plain functions?
C++
Optimization
C++11
Lambda
Compiler Optimization
Why does GCC generate such radically different assembly for nearly the same C code?
C
Gcc
Assembly
X86
Compiler Optimization
Can I hint the optimizer by giving the range of an integer?
C++
Optimization
Integer
Range
Compiler Optimization
Limits of Nat type in Shapeless
Scala
Numbers
Compiler Optimization
Shapeless
Why does the enhanced GCC 6 optimizer break practical C++ code?
C++
Gcc
Compiler Optimization
Undefined Behavior
How do I make an infinite empty loop that won't be optimized away?
C
Clang
Language Lawyer
Compiler Optimization
Bubble sort slower with -O3 than -O2 with GCC
C
Gcc
X86 64
Cpu Architecture
Compiler Optimization
Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
C
Performance
Compiler Optimization
Using this pointer causes strange deoptimization in hot loop
C++
C++11
Optimization
Compiler Optimization
Strict Aliasing
Clang optimization levels
Clang
Compiler Optimization
User Manual
Why are elementwise additions much faster in separate loops than in a combined loop?
C++
Performance
X86
Vectorization
Compiler Optimization
Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
Gcc
Assembly
Floating Point
Compiler Optimization
Fast Math
Why can't C compilers rearrange struct members to eliminate alignment padding?
C
Struct
Compiler Optimization
Memory Alignment
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
C++
Performance
Gcc
X86 64
Compiler Optimization
Efficiency of premature return in a function
C#
Java
C++
C
Compiler Optimization
Why do we use volatile keyword?
C++
Volatile
Compiler Optimization
How to remove "noise" from GCC/clang assembly output?
C++
Assembly
Gcc
Clang
Compiler Optimization
How to disable compiler optimizations in gcc?
C
Gcc
Compiler Optimization
Compiler Options
G++ optimization beyond -O3/-Ofast
C++
G++
Compiler Optimization
Why can't GCC generate an optimal operator== for a struct of two int32s?
C++
Gcc
X86 64
Compiler Optimization
Micro Optimization
Why doesn't 'd /= d' throw a division by zero exception when d == 0?
C++
Compiler Optimization
Undefined Behavior
Division
Divide by-Zero
How to turn off gcc compiler optimization to enable buffer overflow
C
Gcc
Buffer Overflow
Compiler Optimization
Why would code actively try to prevent tail-call optimization?
C++
C
Optimization
Compiler Optimization
Tail Call-Optimization
Is there a reason why not to use link-time optimization (LTO)?
C++
C
Performance
Compilation
Compiler Optimization
Is it possible to tell the branch predictor how likely it is to follow the branch?
C
Gcc
X86
Compiler Optimization
Micro Optimization
What is supercompilation?
Haskell
Compilation
Compiler Optimization
Can compiler optimization introduce bugs?
Optimization
Compiler Construction
Compiler Optimization
What is the difference between the /Ox and /O2 compiler options?
C++
Visual Studio
Visual C++
Compiler Optimization
Compiler Options
Why is "while (i++ < n) {}" significantly slower than "while (++i < n) {}"
Java
Performance
Compiler Optimization
Post Increment
Pre Increment
Compiler stops optimizing unused string away when adding characters
C++
Gcc
Compilation
Clang
Compiler Optimization
Why is std::fill(0) slower than std::fill(1)?
C++
Performance
X86
Compiler Optimization
Memset
What kind of optimization does const offer in C/C++?
C++
C
Constants
Compiler Optimization
Is this a JVM bug or "expected behavior"?
Java
Jvm
Compiler Optimization
Integer Overflow
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
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
Why does the Rust compiler not optimize code assuming that two mutable references cannot alias?
Rust
Reference
Compiler Optimization
Llvm Codegen
Why is memcmp(a, b, 4) only sometimes optimized to a uint32 comparison?
C
Gcc
Clang
X86 64
Compiler Optimization
Why can't GCC optimize the logical / bitwise AND pair in "x && (x & 4242)" to "x & 4242"?
C++
Gcc
Optimization
Compiler Optimization
De Morgan's Law optimization with overloaded operators
C++
Operator Overloading
Language Lawyer
Compiler Optimization
Is it possible to implement bitwise operators using integer arithmetic?
Bitwise Operators
Discrete Mathematics
Compiler Optimization
Why don't modern compilers coalesce neighboring memory accesses?
C++
Assembly
Optimization
Compiler Optimization
Why is -march=native used so rarely?
Gcc
Clang
Compiler Optimization
How does GCC optimize out an unused variable incremented inside a loop?
C
Gcc
Compiler Optimization
Disassembly
Can the compiler optimize from heap to stack allocation?
C++
Memory Management
Language Lawyer
Compiler Optimization
Is a C compiler allowed to coalesce sequential assignments to volatile variables?
C
Language Lawyer
Compiler Optimization
Volatile
Why is there no implicit parallelism in Haskell?
Haskell
Concurrency
Parallel Processing
Compiler Optimization
Why don't compilers merge redundant std::atomic writes?
C++
Multithreading
C++11
Compiler Optimization
Stdatomic