EE pass mishandles subregs of promoted variables

Bug #728315 reported by Richard Sandiford on 2011-03-03
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Linaro GCC
Fix Released
Undecided
Richard Sandiford
Linaro GCC Tracking
Invalid
Undecided
Richard Sandiford

Bug Description

The bug reported here:

    https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html

is caused by a mishandling of subregs of promoted variables in the Linaro/CS-specific extension-elimination pass. These subregs record that the inner register is known to be sign- or zero-extended beyond the outer mode, so the pass should should either remove the promoted flag or treat these subregs as referring to the whole of the inner register. the former would pessimise combine (which makes good use of these notes) and the latter seems more in keeping with this style of pass.

Related branches

I've just merged Richard's patch into lp:gcc-linaro/4.5

Changed in gcc-linaro:
milestone: none → 4.5-2011.04-0
status: In Progress → Fix Committed

Assigning Richard to submit this upstream (or mark it "Invalid", if that's not appropriate).

Related: lp:gcc-linaro/4.5,revno=99488

Changed in gcc-linaro-tracking:
assignee: nobody → Richard Sandiford (rsandifo)
milestone: none → 4.7.0
Changed in gcc-linaro-tracking:
status: New → Invalid
Michael Hope (michaelh1) on 2011-04-21
Changed in gcc-linaro:
status: Fix Committed → Fix Released
tags: added: 46merge
tags: removed: 46merge
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