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Questions - ceil

Why does NVCC not optimize away ceilf() for literals?

(Followup question for Compile-time ceiling function, for literals, in C?) Considering the following CUDA function: __device__ int foo_f() { return ceilf(1007.1111); } It should be easy to optimize t...
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ein supports Moderator Strike

floating-point

cuda

compiler-optimization

ceil

ptx

Votes: 0

Answers: 1

Latest Answer

As you are no doubt fully aware, PTX is a virtual assembly language and isn't run by the GPU. If we compile your code to machine code, we see this: $ cat bogogogo.cu __device__ int foo_f() { return ce...
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talonmies

Compile-time ceiling function, for literals, in C?

I have a C program which involves some floating-point literal that's defined by a macro. And - it just so happens that in a performance-critical part of the code, I need the ceiling of that floating-p...
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ein supports Moderator Strike

c

floating-point

compile-time

ceil

compile-time-constant

Votes: 0

Answers: 2

Latest Answer

If your literal fits nicely within the int representation range, you will often be able to rely on compiler optimizations. clang and gcc, for example, will go as far as simply optimizing ceilf() away ...
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ein supports Moderator Strike

is it possible to round the last 3 digits of a number in c?

i would like to round the last 3 digits of the float number 169786.122 and leaving only 3 digits is it possible to do it with the math.h library and the ceil function? in case of 169786.122 == 170 in ...
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user14570759

c

math

numbers

rounding

ceil

Votes: 0

Answers: 1

Latest Answer

If: breaking ties by choosing the even multiple of 1000 is satisfactory, the desired multiple of 1000 is representable in the float format, and the float format uses base two or ten, then (x - remai...
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Eric Postpischil

Storing ceil( divison ) in an integer in c++

Sorry for the maybe stupid question. I wanted to write a straightforward c++ code that takes the number of people and returns how many baking trays of 12 muffins I have to bake when everyone gets two ...
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buttercup

c++

ceil

Votes: 0

Answers: 0

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