Hey compiler folks: about ten years back a lot of effort went into auto vectorization. Did it pan out? I see it lives on in compilers, does it get invoked much and does it have significant effects?
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Replying to @davidcrawshaw
If you haven't seen it already, you might be interested in LLVM's doc page on this: https://llvm.org/docs/Vectorizers.html …
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Replying to @McLean0 @davidcrawshaw
IIRC, the potential for pointer aliasing causes problems with autovectorization on most C code. In languages like Rust, though, it's much more frequently possible for the compiler to prove absence of aliasing, which makes autovectorization much more effective
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Replying to @McLean0 @davidcrawshaw
C programmers prefer writing and maintaining 1000s of loc of vector asm or intrinsics over learning to use the restrict keyword...
6:46 AM - 23 Aug 2018
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