[LLVMbugs] [Bug 1815] codegen crash without DAG combiner

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1815


Dan Gohman <djg at cray.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #4 from Dan Gohman <djg at cray.com>  2007-11-26 17:57:39 ---
The xform is producing a divide only because it expects the divide will be
optimized into something else, so checking for legality of the divide isn't
exactly what's needed.

It looks like LLVM's division-by-integer-constant logic only handles i32 and
i64 right now, so that's why this i8 udiv isn't being optimized.

I fixed the bug by disabling the xform in the case that the division isn't
optimized. When it is optimized, the expanded code is already be legal.

The commit is here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20071126/055807.html


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