JDK-6251002 : Math.exp() needs to be intrinsified
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 6
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris
  • CPU: sparc
  • Submitted: 2005-04-05
  • Updated: 2015-11-13
  • Resolved: 2005-04-20
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JDK 6
6 b33Fixed
Related Reports
Relates :  
JDK-7175279 - Don't use x87 FPU on x86-64
Relates :  
JDK-6849984 - Value methods for platform dependent math functions constant fold incorrectly
Description
Math.exp() should be intrinsified to use hardware...
###@###.### 2005-04-05 21:45:13 GMT
Comments
EVALUATION Performance Improvements: 2x3.2Ghz P4 (Linux) EXP avg 71.2 ns total 1.42E0 s for exp (~ 228.0 cycles) avg 519.4 ns total 1.04E1 s for pow (~ 1662.1 cycles) avg 71.2 ns total 1.42E0 s for exp (~ 227.7 cycles) avg 539.6 ns total 1.08E1 s for pow (~ 1726.9 cycles) Java6-b30 avg 168.0 ns total 3.36E0 s for exp (~ 537.8 cycles) avg 571.4 ns total 1.14E1 s for pow (~ 1828.6 cycles) avg 176.0 ns total 3.52E0 s for exp (~ 563.2 cycles) avg 583.1 ns total 1.17E1 s for pow (~ 1865.8 cycles) U80 450Mhz EXP avg 293.4 ns total 5.87E0 s for exp (~ 938.9 cycles) avg 935.0 ns total 1.87E1 s for pow (~ 2992.0 cycles) avg 297.5 ns total 5.95E0 s for exp (~ 952.0 cycles) avg 935.8 ns total 1.87E1 s for pow (~ 2994.7 cycles) Java6-b30 avg 735.8 ns total 1.47E1 s for exp (~ 2354.7 cycles) avg 1129.6 ns total 2.26E1 s for pow (~ 3614.7 cycles) avg 732.1 ns total 1.46E1 s for exp (~ 2342.7 cycles) avg 1131.6 ns total 2.26E1 s for pow (~ 3621.3 cycles) AMD64 2x1.8Ghz (Linux) EXP avg 82.8 ns total 1.66E0 s for exp (~ 265.0 cycles) avg 289.4 ns total 5.79E0 s for pow (~ 926.2 cycles) avg 82.8 ns total 1.66E0 s for exp (~ 265.0 cycles) avg 289.5 ns total 5.79E0 s for pow (~ 926.4 cycles) Java6-b30 avg 169.0 ns total 3.38E0 s for exp (~ 541.0 cycles) avg 323.7 ns total 6.47E0 s for pow (~ 1035.7 cycles) avg 169.2 ns total 3.38E0 s for exp (~ 541.3 cycles) avg 323.9 ns total 6.48E0 s for pow (~ 1036.5 cycles) ###@###.### 2005-04-12 18:23:03 GMT
12-04-2005
SUGGESTED FIX http://analemma.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2005/20050411153633.azeem.exp/workspace/webrevs/webrev-2005.04.12/index.html ###@###.### 2005-04-12 18:23:03 GMT Also this is required as well: http://analemma.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2005/20050413113329.azeem.exp/workspace/webrevs/webrev-2005.04.13/index.html ###@###.### 2005-04-13 23:22:18 GMT
12-04-2005