assertion failed while compiling libmng

[asl]

Bugzilla Link	1011
Resolution	FIXED
Resolved on	Feb 22, 2010 12:43
Version	trunk
OS	Linux
Attachments	Reduced sources, Original sources

Extended Description

While compiling libmng (via llvm-gcc4 -O2) I've got an assertion:

cc1: /home/asl/proj/llvm/src/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1116:
llvm::SDOperand llvm::SelectionDAG::getNode(unsigned int, llvm::MVT::ValueType,
llvm::SDOperand): Assertion `Operand.getValueType() > VT && "Invalid truncate
node, src < dst!"' failed.
libmng_pixels.i:137: internal compiler error: Aborted
Please submit a full bug report,
with preprocessed source if appropriate.
See URL:http://llvm.org/bugs for instructions.

Please find:

1. Original source
2. Reduced sources (via delta).

Everything was ok without any optimizations (but no ok with just -O), so the
problem itself can be not in backend, but in some optimization passes.

[asl]

assigned to @lattner

[lattner]

verified

[lattner]

Fixed, patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061120/040136.html

Testcase here: CodeGen/Generic/2006-11-20-DAGCombineCrash.ll

-Chris