https://llvm.org/bugs/show_bug.cgi?id=28753
Bug ID: 28753
Summary: SystemZ backend: failing assert in ScheduleDAGRRList
Product: new-bugs
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: colp...@ca.ibm.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16831
--> https://llvm.org/bugs/attachment.cgi?id=16831&action=edit
C source
To reproduce, compile bug.c with
clang -O1 -target s390x-linux-gnu -c bug.c
Compilation aborts during "DAG->DAG Pattern Instruction Selection" with this
failed assert:
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp:1197: llvm::MVT
getPhysicalRegisterVT(llvm::SDNode*, unsigned int, const
llvm::TargetInstrInfo*): Assertion `MCID.ImplicitDefs && "Physical reg def must
be in implicit def list!"' failed.
Compiling at -O0 does not reproduce the failure. Changing "shift" in bug.c to a
value lower than 64 also causes compilation to pass.
LLVM/Clang is from SVN trunk 276984.
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