Initial commit: add .gitignore and README

.venv/lib/python3.12/site-packages/mypyc/transform/lower.py

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+"""Transform IR to lower-level ops.
+
+Higher-level ops are used in earlier compiler passes, as they make
+various analyses, optimizations and transforms easier to implement.
+Later passes use lower-level ops, as they are easier to generate code
+from, and they help with lower-level optimizations.
+
+Lowering of various primitive ops is implemented in the mypyc.lower
+package.
+"""
+
+from __future__ import annotations
+
+from mypyc.ir.func_ir import FuncIR
+from mypyc.ir.ops import PrimitiveOp, Value
+from mypyc.irbuild.ll_builder import LowLevelIRBuilder
+from mypyc.lower.registry import lowering_registry
+from mypyc.options import CompilerOptions
+from mypyc.transform.ir_transform import IRTransform
+
+
+def lower_ir(ir: FuncIR, options: CompilerOptions) -> None:
+    builder = LowLevelIRBuilder(None, options)
+    visitor = LoweringVisitor(builder)
+    visitor.transform_blocks(ir.blocks)
+    ir.blocks = builder.blocks
+
+
+class LoweringVisitor(IRTransform):
+    def visit_primitive_op(self, op: PrimitiveOp) -> Value | None:
+        # The lowering implementation functions of various primitive ops are stored
+        # in a registry, which is populated using function decorators. The name
+        # of op (such as "int_eq") is used as the key.
+        lower_fn = lowering_registry[op.desc.name]
+        return lower_fn(self.builder, op.args, op.line)