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[Jikesrvm-core] [ jikesrvm-Patches-1456622 ] Modified BURS to better handle a special case of COND_MOV
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From: SourceForge.net <no...@so...> - 2006-03-23 01:40:50
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Patches item #1456622, was opened at 2006-03-22 19:40 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=712770&aid=1456622&group_id=128805 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: G. Kolpin (gkolpin) Assigned to: Nobody/Anonymous (nobody) Summary: Modified BURS to better handle a special case of COND_MOV Initial Comment: Modified BURS to better handle the special case of a conditional move instruction where the true and false values are integers and differ by one. Previously, the code generated used the following to place either value into result: result = ((cond ? 0 : -1) & (false_const - true_const)) + true_const . In the special case where true_const - false_const == 1, we can optimize slightly so that result = (cond ? 1 : 0) + false_const . When false_const - true_const == 1, we first must negate the conditional result: result = (cond ? -1 : 0) + false_const . STATEMENT OF ORIGIN FOR A SINGLE CONTRIBUTOR I, _Garrett Kolpin_: (a) represent that either: (i) I am the only author and owner of the contributed software (described as/entitled _Modified BURS to handle special case for a conditional move instruction_), which was neither derived nor copied from any other software, or (ii) that any exception to (i) is software which was obtained under the CPL (Common Public License), and (b) hereby agree to license this contributed software under the CPL. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=712770&aid=1456622&group_id=128805 |