This computes a structural hash while allowing for selective ignoring of
certain operands based on a custom function that is provided. Instead of
a single hash value, it now returns FunctionHashInfo which includes a
hash value, an instruction mapping, and a map to track the operand
location and its corresponding hash value that is ignored.
Depends on https://github.com/llvm/llvm-project/pull/112621.
This is a patch for
https://discourse.llvm.org/t/rfc-global-function-merging/82608.
This pass extends StructuralHash to include much more information about
the IR under analysis. This is done with a flag (Detailed) to configure
the behavior. The detailed behavior is intended for use in expensive
checks and downstream.
Differential Revision: https://reviews.llvm.org/D158250
Reviewed-By: aeubanks, nikic
