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cmd/link: use m to store div/mod denominator on arm #6699

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rsc opened this issue Oct 31, 2013 · 7 comments

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commented Oct 31, 2013

Bring back CL 19810043.
However, also:

1. Disallow use of DIV/MOD in NOSPLIT functions.
That will catch functions that are running without a valid m.

2. Rewrite the functions that are caught (usleep, various 64-bit atomics)
to use magic multiplies instead of constant division.
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commented Oct 31, 2013

Comment 1:

This sounds like a great solution.
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commented Dec 4, 2013

Comment 2:

Labels changed: added release-go1.3.

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commented Dec 4, 2013

Comment 3:

Labels changed: removed go1.3.

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commented Dec 4, 2013

Comment 4:

Labels changed: added repo-main.

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commented Apr 3, 2014

Comment 5:

Too late.

Labels changed: added release-go1.4, removed release-go1.3.

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commented Sep 15, 2014

Comment 6:

We did disallow div/mod in nosplit, because they are not nosplit. So at least that's
taken care of.

Labels changed: added release-none, removed release-go1.4.

@rsc rsc added accepted labels Sep 15, 2014

@rsc rsc added this to the Unplanned milestone Apr 10, 2015

@rsc rsc changed the title cmd/5l: use m to store div/mod denominator cmd/link: use m to store div/mod denominator on arm Jun 8, 2015

rsc added a commit that referenced this issue Jul 30, 2015

runtime: replace divide with multiply in runtime.usleep on arm
We want to adjust the DIV calling convention to use m,
and usleep can be called without an m, so switch to a
multiplication by the reciprocal (and test).

Step toward a fix for #6699 and #10486.

Change-Id: Iccf76a18432d835e48ec64a2fa34a0e4d6d4b955
Reviewed-on: https://go-review.googlesource.com/12898
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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commented Jul 30, 2015

CL https://golang.org/cl/12899 mentions this issue.

@rsc rsc closed this in b2dfacf Jul 30, 2015

@mikioh mikioh modified the milestones: Go1.5, Unplanned Jul 31, 2015

@golang golang locked and limited conversation to collaborators Aug 5, 2016

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