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cmd/compile: don't use REP prefix for reverse-order copying on amd64, 386 #7681

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randall77 opened this issue Apr 1, 2014 · 2 comments
Open

cmd/compile: don't use REP prefix for reverse-order copying on amd64, 386 #7681

randall77 opened this issue Apr 1, 2014 · 2 comments
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@randall77
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REP prefixes have a high startup cost.  Most were eliminated with CL 81370046.  For
overlapping source/destinations when we have to copy in descending address order, they
are still used.  Fix that.
@ianlancetaylor
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Comment 1:

Labels changed: added repo-main, release-go1.4.

@rsc
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rsc commented Sep 15, 2014

Comment 2:

Labels changed: added release-go1.5, removed release-go1.4.

Status changed to Accepted.

@bradfitz bradfitz modified the milestone: Go1.5 Dec 16, 2014
@rsc rsc removed accepted labels Apr 14, 2015
@rsc rsc modified the milestones: Unplanned, Go1.5 Apr 26, 2015
@rsc rsc changed the title cmd/6g, cmd/8g: don't use REP prefix for reverse-order copying cmd/compile: don't use REP prefix for reverse-order copying on amd64, 386 Jun 8, 2015
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@bradfitz @rsc @ianlancetaylor @randall77