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There seems to be a large regression in performance when function pointer calls where changed to use the link register instead of the count register. Based on when this change went in, this likely affects all versions back to go1.14. The impact can be mitigated by setting the appropriate branch hint for this usage e.g
We realize this is during the freeze but thought we would see if it might possibly go in since it makes a nice improvement and is a very simple fix.
ianlancetaylor
changed the title
ppc64 function pointer call performance regression
cmd/compile: ppc64 function pointer call performance regression
Nov 19, 2020
There seems to be a large regression in performance when function pointer calls where changed to use the link register instead of the count register. Based on when this change went in, this likely affects all versions back to go1.14. The impact can be mitigated by setting the appropriate branch hint for this usage e.g
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