840e8ea740
Rewrite map() to allow any number of arguments, now also used for 2-argument (pow) and 3-argument (fma) operations. I left a note about fma()... I can't understand why, but calling as map(fmaf, x,y,z) ends up with scalar calls to fmaf(), but with the lambda indirection we see perfect vector codegen. I had to break map() back into two parts. I don't see any way to pass both a variadic number of arguments and play our trick with the default std::index_sequence parameter. The lane lambda similarly exists only to split up the expansion of the Rest... type pack from the I... index pack; you can't use two pack expansions in the same expression. Change-Id: Ia156a7fd846237f687d6018a7f95550c9fd4a56d Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325736 Commit-Queue: Mike Klein <mtklein@google.com> Reviewed-by: Herb Derby <herb@google.com> |
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