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by anon-3988
258 days ago
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I feel like people should be writing stupid code, and in the case where its a compiled language, we should ask compiler or the language for better optimization. The other day, I was writing a check of a struct that have certain structures (protobuf probably have something like this) struct S { int a; int b; int c; int d; int e; /* about 15 more members */ } so I wrote const auto match_a = s.a == 10;
const auto match_b = s.c == 20;
const auto match_c = s.e == 30;
/* about 15 more of these */
if (match_a && match_b && match_c) { return -1; } Turns out compilers (I think because of the language) totally shit the bed at this. It generates a chain of 20 if-else instead of a mask using SIMD or whatever. I KNOW this is possible, so I asked an LLM, it was able to produce said code that uses SIMD. |
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