RFR (S): 8067014: LinearScan::is_sorted significantly slows down fastdebug builds' performance (original) (raw)

Aleksey Shipilev aleksey.shipilev at oracle.com
Fri Mar 6 11:41:53 UTC 2015

Hi Filipp,

On 06.03.2015 14:33, Filipp Zhinkin wrote:

In certain cases (like -client -Xcomp) C1 compilation is very slow w/ fastdebug builds. A place where we spent enormous amount of time is LinearScan::issorted method, which simply verifies that a list that should be sorted is actually sorted and that both sorted and unsorted lists contains same intervals.

Okay, what caller of is_sorted dominates? Maybe instead of optimizing the is_sorted itself, you need to move/relax the assert in some selected places?

That is to say I am not fond of complicating the non-product code that does verification without a compelling reason to do so; let's first figure out if we "just" do excess asserts.

Thanks, -Aleksey.

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