Timeline for Is it always wrong to optimize before profiling?
Current License: CC BY-SA 2.5
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| Mar 31, 2011 at 20:57 | comment | added | Cercerilla | This is pretty much my thought as well. There are things that I would classify as optimizations, but sometimes it seems quite obvious that it's going to be a bottleneck. When I know that I'm trying to squeeze all the performance I can out of the hardware, sometimes it makes sense to do a little performance tweaking while I'm working in a function if it won't hurt maintainability and is going to be called a lot. | |
| Mar 31, 2011 at 15:13 | comment | added | unholysampler | @dbyrne: This. You said it better than I did. | |
| Mar 31, 2011 at 15:11 | comment | added | unholysampler | @BerinLoritsch: There are never perfect generalizations, but many compilers can optimize, especially when the result is not being stored anywhere. I am more focused on the fact that there a likely other things you will be able to change that have a much bigger impact than changing how you increment a number. | |
| Mar 31, 2011 at 15:06 | comment | added | dbyrne | @Berin most (all?) fine-grained optimizations depend on the processor and what the compiler produces. Thats why its not bad to make some obvious, high-level optimizations early on, and wait until after you've done some profiling to do any sort of micro-tuning. | |
| Mar 31, 2011 at 15:05 | comment | added | David Thornley | @unholysampler: There is the fact that ++i will always be at least as good as i++, but the reverse isn't true. | |
| Mar 31, 2011 at 15:03 | history | edited | dbyrne | CC BY-SA 2.5 |
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| Mar 31, 2011 at 15:00 | comment | added | Berin Loritsch | @unholysampler, doesn't that really depend on the processor and what the compiler produces? Those types of optimizations will work on some machines and not others. Kind of silly if you ask me. | |
| Mar 31, 2011 at 14:49 | comment | added | unholysampler | +1: There has been so much talk about i++ vs ++i it makes me want to punch babies. | |
| Mar 31, 2011 at 14:44 | history | answered | dbyrne | CC BY-SA 2.5 |