[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.