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submitted 1 year ago by ray@lemmy.ml to c/opensource@lemmy.ml
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[-] MigratingApe@lemmy.dbzer0.com 47 points 1 year ago

The reason is SIMD instructions / vectorized assembly instructions with consideration for delay slots, instruction latency, memory access times etc., for which GCC and Clang optimizers are both terrible and cannot automatically transform C code to them in any but simple cases.

This is also a reason why specialized DSP processors with SIMD capabilities have dedicated proprietary compilers for them.

this post was submitted on 09 Oct 2023
247 points (98.8% liked)

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