RFR(M): 8073480: C2 should optimize explicit range checks
aleksey.shipilev at oracle.com
Mon Mar 2 17:56:07 UTC 2015
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::u_loop at 22 (line 65)
>> 0x0000000110355f48: inc %r10d ;*iinc
>> ; - arrays.ArrayTest::u_loop at 24 (line 64)
>> 0x0000000110355f4b: cmp %r11d,%r10d
>> 0x0000000110355f4e: jl 0x0000000110355f40 ;*if_icmpge
>> ; - arrays.ArrayTest::u_loop 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 u_loop() 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.
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