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[Statepoints] Operand folding in presense of tied registers.

Authored by dantrushin on Jun 10 2020, 6:01 AM.

Description

[Statepoints] Operand folding in presense of tied registers.

Implement proper folding of statepoint meta operands (deopt and GC)
when statepoint uses tied registers.
For deopt operands it is just about properly preserving tiedness
in new instruction.
For tied GC operands folding is a little bit more tricky.
We can fold tied GC operands only from InlineSpiller, because it knows
how to properly reload tied def after it was turned into memory operand.
Other users (e.g. peephole) cannot properly fold such operands as they
do not know how (or when) to reload them from memory.
We do this by un-tieing operand we want to fold in InlineSpiller
and allowing to fold only untied operands in foldPatchpoint.

Details

Committed
dantrushinAug 5 2020, 6:18 AM
Parents
rG4dcbb9cef71a: [clang] Add -fno-delayed-template-parsing to the added unit tests in…
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