47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
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"""
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Copy instruction lowering
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MIR13 PHI-off uses explicit copies along edges/blocks to model merges.
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"""
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import llvmlite.ir as ir
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from typing import Dict, Optional, Any
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from utils.values import resolve_i64_strict
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def lower_copy(
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builder: ir.IRBuilder,
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dst: int,
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src: int,
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vmap: Dict[int, ir.Value],
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resolver=None,
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current_block=None,
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preds=None,
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block_end_values=None,
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bb_map=None,
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ctx: Optional[Any] = None,
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):
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"""Lower a copy by mapping dst to src value in the current block scope.
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Prefer same-block SSA from vmap; fallback to resolver to preserve
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dominance and to localize values across predecessors.
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"""
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# If BuildCtx is provided, prefer its maps for consistency.
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if ctx is not None:
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try:
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if getattr(ctx, 'resolver', None) is not None:
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resolver = ctx.resolver
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if getattr(ctx, 'vmap', None) is not None and vmap is None:
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vmap = ctx.vmap
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if getattr(ctx, 'preds', None) is not None and preds is None:
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preds = ctx.preds
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if getattr(ctx, 'block_end_values', None) is not None and block_end_values is None:
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block_end_values = ctx.block_end_values
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if getattr(ctx, 'bb_map', None) is not None and bb_map is None:
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bb_map = ctx.bb_map
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except Exception:
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pass
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# Prefer local SSA; resolve otherwise to preserve dominance
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val = resolve_i64_strict(resolver, src, current_block, preds, block_end_values, vmap, bb_map)
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if val is None:
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val = ir.Constant(ir.IntType(64), 0)
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vmap[dst] = val
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