[Bug target/29825] [4.1 regression] ICE in extract_insn, at recog.c:2084
------- Comment #10 from jakub at gcc dot gnu dot org 2006-11-14 10:45 -------
The problem is in the make_tree change of PR28915.
make_tree is called with (const (unspec (something) ) ), before make_tree
would just create a dummy VAR_DECL with DECL_RTL set to this, but now
calls make_tree recursively and thus returns a dummy VAR_DECL with DECL_RTL
set to (unspec (something) ) - note that CONST is lost.
It is then folded and expanded, but CONST is never added back and i386 backend
relies on it (and I believe other backends have similar requirements).
I don't know why exactly the make_tree change was done, but certainly
it should be limited to RTLs inside CONST that the middle-end groks fully.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29825
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