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From "Alex Astapchuk (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2223) [drlvm][jit][performance]Inlined int64 arithmetic routines - speedup of 64 arithmetics
Date Fri, 17 Nov 2006 09:03:40 GMT
[drlvm][jit][performance]Inlined int64 arithmetic routines - speedup of 64 arithmetics
--------------------------------------------------------------------------------------

                 Key: HARMONY-2223
                 URL: http://issues.apache.org/jira/browse/HARMONY-2223
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
            Reporter: Alex Astapchuk


The attached 2 patches contain IA-32 codegenerator fixes that generate inlined long 64 bit
arithmetics 
code instead of currently used internal or VM helper.

One of the patches contains Encoder fixes and new instructions (so the whole VM must be rebuild),
and the 
second one exploits them in Jitrino CG.

The proposed code generates routines for 64bit multiplications, division and remainder.

The attached test case shows nearly 20% speedup with the fix. 
I got from 2954ms to 2344ms on WinXP/Pentium4 on the provided test.

YMMV: this is a microbenchmark, and results on real apps may vary depending on workload.

Please, run the test as follows:

===== run_measure.sh =====
#!/bin/bash
NOINLINE_ARGS="-Djit.arg.inline_mul64=false -Djit.arg.inline_mul64_checks=false -Djit.arg.inline_div64=false
-Djit.arg.inline_rem64=false"

echo "*** No inlining"
java ${NOINLINE_ARGS} test_longmuldiv_speed

echo "***  With inlining"
java test_longmuldiv_speed
==========================


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