[Bug tree-optimization/40464] [4.5 Regression] FAIL: g++.dg/torture/pr34099.C -O1 (internal compiler error) at -O1 and above

[jamborm at gcc dot gnu dot org]

------- Comment #10 from jamborm at gcc dot gnu dot org  2009-08-06 17:31 -------
Created an attachment (id=18311)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18311&action=view)
workaround patch

I still  believe that the  gimplifier should not do  this substitution
this late in  the compilation.  However, since I do  not have time nor
am I brave enough to attempt to fix it there, I at least tried to make
sure that SRA does not create  situations which lead to this error and
the attached patch is the result of that effort.  I am currently
bootstrapping it on an x86_64.

However, it  should be noted that it  comes at a slight  cost, both in
run  time as this  leads to  less structure  copy propagation  (and at
least java uses DECL_VALUE_EXPR even on x86_64, I believe) and compile
time, as we  have to check for it  everywhere.  Moreover, every single
user  of force_gimple_operand  is  still  at risk  of  running into  a
problem like this.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40464