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LLVM provides target hooks to recognise stack spill and restore instructions, such as isLoadFromStackSlot, and it also provides post frame elimination versions such as isLoadFromStackSlotPostFE. These are supposed to return the store-source and load-destination registers; unfortunately on X86, the PostFE recognisers just return "1", apparently to signify "yes it's a spill/load". This patch alters the hooks to correctly return the store-source and load-destination registers: This is really useful for debug-info as we it helps follow variable values as they move on/off the stack. There should be no codegen changes: the only other users of these PostFE target hooks are MachineInstr::getRestoreSize and MachineInstr::getSpillSize, which don't attempt to interpret the returned register location. While we're here, delete the (InstrRef) LiveDebugValues heuristic that tries to find the spill source register by looking for a killed reg -- we should be able to rely on the target hooks for that. This involves temporarily turning off a n InstrRef LivedDebugValues test on aarch64 (patch to re-enable it is in D104521). Differential Revision: https://reviews.llvm.org/D105428 |
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| .. | ||
| InstrRefBasedImpl.cpp | ||
| LiveDebugValues.cpp | ||
| LiveDebugValues.h | ||
| VarLocBasedImpl.cpp | ||