https://llvm.org/bugs/show_bug.cgi?id=31536
Bug ID: 31536
Summary: Assertion failed: (NodeToMatch->getOpcode() !=
ISD::DELETED_NODE && "NodeToMatch was removed partway
through selection"), function SelectCodeCommon
Product: new-bugs
Version: 3.9
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dimi...@andric.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
As noted in bug 28705, the following test case, reduced from
https://bugs.freebsd.org/215649:
//////////////////////////////////////////////////////////////////////
// clang -cc1 -triple x86_64 -S -O2 -vectorize-loops testcase.cpp
double x0;
int x1, x2, x3, x4;
double *x5;
void x6() {
x4 = (x1 & 512 - 1) + 1;
for (; x3; x3++, x5 += x4)
for (; x2 < 0; x2++)
x5[x2] = x0;
}
//////////////////////////////////////////////////////////////////////
results in:
Assertion failed: (NodeToMatch->getOpcode() != ISD::DELETED_NODE &&
"NodeToMatch was removed partway through selection"), function
SelectCodeCommon, file lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp, line
3387.
It turned out that this assertion already fired in the very first
release_39 branch point, r275826, and has not been fixed during the
3.9.0 and 3.9.1 release cycles.
When I followed trunk from r275826 onwards, I ended up at Wei Mi's r276136,
which seemed to fix this assertion. However, in bug 28705 he agrees that
r276136, and its follow-ups r278160 and r278161 just seem to paper over it.
Thus I am filing this bug as a separate case. It may or may not be related to
bug 30775, which is about the same assertion (but with a different test case,
and it still occurs with the latest trunk, as of 2017-01-01).
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