https://bugs.llvm.org/show_bug.cgi?id=39554
Bug ID: 39554
Summary: Add a unit test for frame index expansion
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AVR
Assignee: unassignedb...@nondot.org
Reporter: m...@dylanmckay.io
CC: llvm-bugs@lists.llvm.org
In avr-rust bug #112, we encountered a backend bug caused by invalid expansion
of a FRMIDX instruction into a MOVWRdRr instruction. The backend would leave an
extraneous operand from the original FRMIDX that was not consistent with the
definition of MOVWRdRr.
This would trigger an assertion:
Assertion failed: ((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
OpNo < MCID->getNumOperands() || isMetaDataOp) &&
"Trying to add an operand to a machine instr that is
already done!"),
function addOperand, file llvm/lib/CodeGen/MachineInstr.cpp
More informatiob about that bug can be found at:
https://github.com/avr-rust/rust/issues/112
We should write unit tests that cover the expansion of FRMIDX nodes into
MOVWRdRr instructions.
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