Bjorn Pettersson 109cc5adcc [DAGCombine] Fold SRA of a load into a narrower sign-extending load ...

An sra is basically sign-extending a narrower value. Fold away the
shift by doing a sextload of a narrower value, when it is legal to
reduce the load width accordingly.

Differential Revision: https://reviews.llvm.org/D116930

2022-01-25 12:14:48 +01:00

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