[girvo]

Isn’t the reason they had to use inline assembly there because the compiler they’re using doesn’t have that particular instruction bound as an intrinsic?

What do you do in that case? I’m genuinely curious as it’s something I’ve run up against: the vector extensions for the LX7 processor in the ESP32-S3 don’t have intrinsics for them.

[corysama]

There are intrinsics for a wide range of ARM and PowerPC SIMD instructions, a huge range of Intel SIMD instructions and several useful instructions like ByteSwap or FindFirstSetBit on several architectures.

But, there is not an instrinsic for every instruction nor for useful instructions on every architecture. In those cases, you might be lucky to have the compiler recognize very specific patterns in C (compilers are great at recognizing C implementations of byteswap, for example). But, otherwise you’ll have to write inline assembly if you want to utilize those features.

[15155]

You continue doing what you are doing.

Intrinsics in many languages are just a file full of inline ASM somewhere.