Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Which operation should be faster on a x86 CPU on Linux and what are the average differences (in %):
unsigned int x, y, z;
x = y / z;
or:
double x, y, z;
x = y / z;
The operation on double will be executed by the FPU and the CPU may continue to other commands. Is it correct?
Does it depend on compilation flags (I’m using gcc with the -O3 flag)?
If your work is inherently integer-based, the int-float and float-int conversions may ruin any performance benefit. C’s default conversion (truncation) can be particularly slow on older Intel chips.
Apart from that, there are correctness issues with your idea and that’s probably sufficient reason not to do it.