[Hexagon] Handle spills of partially defined double vector registers
After register allocation it is possible to have a spill of a register
that is only partially defined. That in itself it fine, but creates a
problem for double vector registers. Stores of such registers are pseudo
instructions that are expanded into pairs of individual vector stores,
and in case of a partially defined source, one of the stores may use
an entirely undefined register. To avoid this, track the defined parts
and only generate actual stores for those.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284841 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed