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Branch on strides[1] == sizeof(R) so LLVM can version loops on the contiguous case. No change to the type parameters.
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#715 was closed because the type parameters can't say an array is contiguous. A runtime check turns out to be enough: branching on
strides[1] == sizeof(R)lets LLVM version the loop and vectorise the contiguous case.Float32, Julia 1.13.1, Apple M1, ms:
Arraysum, 1e7 vectorsum, 4-D F-order (4e7)sum,v[::2]Strided and C-order arrays are unchanged within noise.
Broadcasting into an
Array(x .* 2) is still ~3x slower than with anArrayinput. That one is on the Julia side: LLVM won't emit a runtime alias check between theArraystore and thePtrload.The new test uses
_testbuffer, so it doesn't need numpy.