[tree-ssa] Mainline merge plan

[Jim Wilson]

Al Stone wrote:
> Probably true.  Mainline has not bootstrapped on
> ia64 for a couple of weeks; the day job has been

I am not aware of any lingering bootstrap problem, and messages to the 
gcc-testresults mailing list seem to confirm that.  There is a 
successful report on Feb 27.

I did an update and bootstrap today, and it did fail.  I tracked it down 
to a problem in global.c.  The list of registers to allocate had two of 
them swapped.  This is presumably a problem with allocno_compare, which 
does some FP arithmetic.  I see Steve Ellcey checked in a patch which 
enabled inline FP divides by default.  If I disable that (by changing 
TARGET_DEFAULT), then the bootstrap succeeds.

So the inline FP divide code is somehow causing allocno_compare in 
global.c to be miscompiled.  I haven't had a chance to look at why yet.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com