RFR(M): 8073480: C2 should optimize explicit range checks (original) (raw)

Aleksey Shipilev aleksey.shipilev at oracle.com
Mon Mar 2 17:56:07 UTC 2015

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Hi Roland,

On 02/25/2015 07:28 PM, Roland Westrelin wrote:

And here is the same on jdk9/hs-rt with your patch applied:

0x0000000110355f40: movslq %r10d,%r9 0x0000000110355f43: add 0x10(%r8,%r9,4),%eax ;*iadd ; - arrays.ArrayTest::uloop at 22 (line 65) 0x0000000110355f48: inc %r10d ;*iinc ; - arrays.ArrayTest::uloop at 24 (line 64) 0x0000000110355f4b: cmp %r11d,%r10d 0x0000000110355f4e: jl 0x0000000110355f40 ;*ificmpge ; - arrays.ArrayTest::uloop at 12 (line 64) I wish we could get rid of those pesky "movslq" instructions :-) but IIUC that is tricky. Are the movslq there only for the uloop() case? Can you send me your test case. I’ll see if I can make them go away.

Do you still want a testcase? I have a JMH nanobenchmark that reproduces exactly this behavior.

-Aleksey.

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