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[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction
- From: "rearnsha at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 25 Jul 2011 09:46:24 +0000
- Subject: [Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction
- Auto-submitted: auto-generated
- References: <bug-49799-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799
--- Comment #7 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2011-07-25 09:45:51 UTC ---
No, you miss the point.
Internally we must not generate (ashift (reg) (const_int)) where the const is
negative.
Note that your testcasegenerates a reg shift.