[WIP][DAG] visitFREEZE - always allow freezing multiple operands #152107
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RKSimon
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Aug 22, 2025
…te poison/undef Add AMDGPUTargetLowering::canCreateUndefOrPoisonForTargetNode handler and tag BFE_I32/U32 nodes as they can only propagate poison, not create poison/undef. Fighting some of the remaining regressions in llvm#152107 - need advice on the v_round_f64 change
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RKSimon
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…2P8AFFINEQB / GF2P8MULB handling All 3 instructions are well defined bit twiddling operations - they do not introduce undef/poison with well defined inputs. Fixes regressions in llvm#152107
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RKSimon
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…NLOG handling Basic bitlogic operations don't create undef/poison. Its proving really annoying to create proper test coverage for these specific opcodes as they tend to appear in later stages - their presence does help in some upcoming patches (e.g. llvm#152107) and I'd prefer to get them committed early.
RKSimon
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…NLOG handling (#155600) Basic bitlogic operations don't create undef/poison. Its proving really annoying to create proper test coverage for these specific opcodes as they tend to appear in later stages - their presence does help in some upcoming patches (e.g. #152107) and I'd prefer to get them committed early.
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Remove the limited freeze multiple operand handling, always freeze all operands and rely on later visitFREEZE calls to merge frozen/unfrozen versions of each node to prevent infinite loops. This also removes the special handling of frozen SRA/SRL nodes as most of the regressions are related Fixes llvm#149798 Fixes llvm#150204
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Remove the limited freeze multiple operand handling, always freeze all operands and rely on later visitFREEZE calls to merge frozen/unfrozen versions of each node to prevent infinite loops.
This also removes the special handling of frozen SRA/SRL nodes as most of the regressions are related
Fixes #149798
Fixes #150204