http://llvm.org/bugs/show_bug.cgi?id=4664
Summary: instcombine generates invalid constant operands
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3270)
--> (http://llvm.org/bugs/attachment.cgi?id=3270)
input bitcode file
Instcombine generates invalid constant operands in the presence of certain
sext/trunc instructions.
To reproduce:
$ opt -inline -instcombine bug.bc -f -o out.bc
Observe that the disassembly file out.ll contains bogus constants, for example:
%0 = malloc [3758096388 x i8*]
In addition, if you try to run llc on the output:
$ llc out.bc
llc: /home/kevin/llvm/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:872:
llvm::SDValue llvm::SelectionDAG::getConstant(uint64_t, llvm::MVT, bool):
Assertion `(EltVT.getSizeInBits() >= 64 || (uint64_t)((int64_t)Val >>
EltVT.getSizeInBits()) + 1 < 2) && "getConstant with a uint64_t value that
doesn't fit in the type!"' failed.
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