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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2984) [drlvm][jit] More peephole optimizations implemented: IMUL and AND+CMP->TEST
Date Fri, 12 Jan 2007 13:33:27 GMT
[drlvm][jit] More peephole optimizations implemented: IMUL and AND+CMP->TEST
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                 Key: HARMONY-2984
                 URL: https://issues.apache.org/jira/browse/HARMONY-2984
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
            Reporter: Mikhail Fursov
         Attachments: peephole.diff

This patch adds 2 new peephole optimizations
1) IMUL 0, 1, 2 or power of 2 is simplified to ADD, MOV or SHIFT. This can not be done in
HLO because these constants appears during HIR->LIR translation
2) AND, CMP, JZ sequence is simplified to TEST, JZ

Linux guru, please check min/max bit asm functions in my patch. What do you think, should
we use platform independed but slow algorithms here instead of asm?

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