Looking at the screenshot, the vertical line indicates bug 2013142. Enabling simd code makes sense to increase binary size I think. Looks like we have an decrease just before this, I think this likely corresponds to https://hg-edge.mozilla.org/integration/autoland/rev/45aab1808108 and https://hg-edge.mozilla.org/mozilla-central/rev/7f78b26ed53d which removed the old C++ jpegxl code. And even after bug 2013142 we are still below the previous baseline. But then at some point after bug 2013142 we increase. If we care about binary size increase that is the increase that we should bisect down.
Bug 2016471 Comment 2 Edit History
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Looking at the screenshot, the vertical line indicates bug 2013142. Enabling simd code makes sense to increase binary size I think. Looks like we have an decrease just before this, I think this likely corresponds to https://hg-edge.mozilla.org/integration/autoland/rev/45aab1808108 and https://hg-edge.mozilla.org/mozilla-central/rev/7f78b26ed53d which removed the old C++ jpegxl code. And even after bug 2013142 we are still below the previous baseline. But then at some point after bug 2013142 we increase. If we care about binary size increase then that is the increase that we should bisect down.