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Better to/from slice operations #571
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accessing slice by index will also check that the index is in range, are you suggesting that adding this here makes the compiler elide the other changes, is this one of the operations that you were looking at generated code for?
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Yes! Range check is performed only once now. For this code compiler output before:
after:
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Sorry, I just noticed the godbolt link.
Godbolt might not tell the full story though as there are different implementations of glam vectors, using simd in some cases and floats in others. It's better to look at the generated assembly. You can use cargo asm, because most things are inlined it's usually necessary to add public test functions that call glam functions and look at the asm for those.
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This PR does not change code for SIMD versions, only code for working with regular slice.
Even if code is inlined, the same branches stay, because it is observable behavior:
Anyway, looking at
cargo asm glam::test_xxx
forVec3A
on my Apple laptop.Code:
Before:
After:
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Thanks for checking. I was mostly wondering if
to_array
resulted in anything weird with underlying simd types since it will be dereferencing all the vector elements, seems fine though.