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Is this floating-point optimization allowed?

c++ floating-point clang asked Jul 12, 2019 at 9:15

stackoverflow.com

83 votes

Is it allowed for a compiler to optimize away a local volatile variable?

c++ language-lawyer c++17 volatile asked Jul 23, 2018 at 6:01

stackoverflow.com

73 votes

std::tuple sizeof, is it a missed optimization?

c++ tuples language-lawyer padding asked Sep 3, 2019 at 12:34

stackoverflow.com

55 votes

Is std::memcpy between different trivially copyable types undefined behavior?

c++ language-lawyer c++17 undefined-behavior strict-aliasing asked Jul 12, 2018 at 8:22

stackoverflow.com

54 votes

Is it possible to get a pointer to one subobject via a pointer to a different, unreleated subobject?

c++ pointers language-lawyer c++17 offsetof asked Sep 17, 2019 at 17:06

stackoverflow.com

47 votes

Floating point equality

c++ floating-point language-lawyer precision floating-point-comparison asked Jul 2, 2018 at 10:26

stackoverflow.com

41 votes

How do I iterate equal values with the standard library?

c++ algorithm c++17 c++-standard-library iterator-range asked Jul 2, 2019 at 20:38

stackoverflow.com

37 votes

Is delete allowed to modify its parameter?

c++ language-lawyer c++1z asked Jul 17, 2017 at 16:57

stackoverflow.com

32 votes

Why doesn't the standard consider a template constructor as a copy constructor?

c++ constructor language-lawyer copy-constructor asked Apr 25, 2019 at 9:22

stackoverflow.com

28 votes

Is it a missed optimization, when a compile-time known reference takes space in a struct?

c++ struct reference initialization language-lawyer asked Sep 5, 2019 at 18:33

stackoverflow.com

Top Answers

Why are the outputs of printf and std::cout different?

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Can the compiler optimize from heap to stack allocation?

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How do I create a "spacer" in a C++ class memory structure?

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Are packed structs portable?

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Repeated integer division by a runtime constant value

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Should I avoid using goto here? If so, how?

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Why does an inline function have lower efficiency than an in-built function?

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Scalar `new T` vs array `new T[1]`

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Foreground service getting killed from Oreo

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Comparing two values in the form (a + sqrt(b)) as fast as possible?

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What are the accuracy & performance benefits of using Math.fma?

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How to improve logic to check whether 4 boolean values match some cases

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Why is there now a difference between "{static const char a[]={...}" and "{const char a[]={...}"?

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Why does const_cast remove constness for a pointer but not for a pointer to a const?

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Base91, how is it calculated?

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Pointer to unique_ptr - is this a loophole?

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Why is an integer array search loop slower in C++ than Java?

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Single quotes as separator in large number?

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Why is stack memory allocated when it is not used?

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Is it safe to link gcc 6, gcc 7, and gcc 8 objects?

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c++ fastest way to check if char is vowel or consonant

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Why is casting from char to std::byte potentially undefined behavior?

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default return value 1 in function with return type int?

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Are inline variables unique across boundaries?

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Can a reinterpret_cast change the object representation?

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Simple example where [[likely]] and [[unlikely]] affect program assembly?

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g++: optimization -march=haswell and newer changes numerical result

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Alignment of array with 0 elements

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Why return value optimization does not work when return ()

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Is there some meaningful statistical data to justify keeping signed integer arithmetic overflow undefined?

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