[all-commits] [llvm/llvm-project] 565fe7: [mlirbc] Add AffineMap serialization support

[Jacques Pienaar via All-commits]

  Branch: refs/heads/users/jpienaar/bcaffinemapadd
  Home:   https://github.com/llvm/llvm-project
  Commit: 565fe7af6110985d5a7509795ae99632469a61cf
      https://github.com/llvm/llvm-project/commit/565fe7af6110985d5a7509795ae99632469a61cf
  Author: Jacques Pienaar <jpienaar at google.com>
  Date:   2026-06-03 (Wed, 03 Jun 2026)

  Changed paths:
    M mlir/include/mlir/IR/BuiltinDialectBytecode.td
    M mlir/lib/IR/BuiltinDialectBytecode.cpp
    M mlir/test/Dialect/Builtin/Bytecode/attrs.mlir
    M mlir/test/Dialect/Builtin/Bytecode/builtin_fixed_0.mlirbc

  Log Message:
  -----------
  [mlirbc] Add AffineMap serialization support

Add binary bytecode encoding for AffineMapAttr, replacing the textual fallback.
AffineMap is encoded as numDims, numSymbols, numResults, followed by the result
expressions. Where each expression, AffineExpr, is encoded as a recursive tree
with a VarInt kind tag followed by kind-specific data.

This uses pre-order encoding to avoid needing a sentinel and adds some special
casing for the common cases. To guard a bit more against malformed bytecode it
uses an iterative parser for these.

Updated the checked in mlirbc file as memref has a default affinemap, so
updating it pre snap.

Assisted-by: Antigravity : Gemini



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