feat(joinir): Phase 221 ExprResult routing in merge pipeline
- Add expr_result handling in merge_joinir_mir_blocks - When expr_result matches a carrier, return carrier PHI dst - Enables expr-position loops to properly return accumulator values Note: Phase 219 regression (loop_if_phi.hako) to be fixed in next commit 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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nyash-codex
@ -87,12 +87,19 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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let (mut used_values, value_to_func_name, function_params) =
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value_collector::collect_values(mir_module, &remapper, debug)?;
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// Phase 220-C: Condition bindings should NOT be added to used_values
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// They will be remapped directly to HOST values in remap_values()
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// (Removed Phase 171-fix logic)
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// Phase 172-3: Add exit_bindings' join_exit_values to used_values for remapping
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// Phase 171-fix: Add condition_bindings' join_values to used_values for remapping
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if let Some(boundary) = boundary {
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for binding in &boundary.condition_bindings {
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 171-fix: Adding condition binding '{}' JoinIR {:?} to used_values",
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binding.name, binding.join_value
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);
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}
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used_values.insert(binding.join_value);
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}
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// Phase 172-3: Add exit_bindings' join_exit_values to used_values for remapping
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for binding in &boundary.exit_bindings {
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if debug {
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eprintln!(
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@ -190,8 +197,7 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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}
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// Phase 3: Remap ValueIds (with reserved PHI dsts protection)
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// Phase 220-C: Pre-populate condition_bindings BEFORE remap_values
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remap_values(builder, &used_values, &mut remapper, &reserved_phi_dsts, boundary, debug)?;
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remap_values(builder, &used_values, &mut remapper, &reserved_phi_dsts, debug)?;
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// Phase 177-3 DEBUG: Verify remapper state after Phase 3
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eprintln!("[DEBUG-177] === Remapper state after Phase 3 ===");
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@ -604,6 +610,68 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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builder.reserved_value_ids.clear();
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}
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// Phase 221: Return expr_result if present (for expr-position loops)
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// The expr_result from boundary contains the JoinIR-local ValueId that should
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// be returned. We need to map it to the HOST ValueId space.
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//
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// IMPORTANT: If expr_result corresponds to a carrier variable, we should return
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// the carrier PHI dst (from loop header), NOT the remapped JoinIR value.
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// This is because carriers use header PHIs which dominate the exit block.
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if let Some(boundary) = boundary {
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eprintln!(
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"[cf_loop/joinir] Phase 221: Boundary present, expr_result={:?}, exit_bindings={:?}",
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boundary.expr_result,
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boundary.exit_bindings.iter().map(|b| (b.carrier_name.as_str(), b.join_exit_value)).collect::<Vec<_>>()
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);
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if let Some(expr_result_id) = boundary.expr_result {
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// Check if expr_result corresponds to a carrier exit binding
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// If so, use the carrier PHI dst instead of remapped value
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for binding in &boundary.exit_bindings {
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if binding.join_exit_value == expr_result_id {
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// expr_result is a carrier! Use the carrier PHI dst
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if let Some(&carrier_phi_dst) = carrier_phis.get(&binding.carrier_name) {
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eprintln!(
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"[cf_loop/joinir] Phase 221: expr_result {:?} is carrier '{}', returning PHI dst {:?}",
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expr_result_id, binding.carrier_name, carrier_phi_dst
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);
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return Ok(Some(carrier_phi_dst));
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} else {
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return Err(format!(
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"[cf_loop/joinir] Phase 221: Carrier '{}' not found in carrier_phis",
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binding.carrier_name
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));
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}
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}
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}
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// expr_result is NOT a carrier - use remapped value
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if let Some(remapped_expr) = remapper.get_value(expr_result_id) {
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eprintln!(
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"[cf_loop/joinir] Phase 221: Returning non-carrier expr_result: JoinIR {:?} → Host {:?}",
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expr_result_id, remapped_expr
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);
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return Ok(Some(remapped_expr));
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} else {
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// expr_result was not remapped - this is an error
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return Err(format!(
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"[cf_loop/joinir] Phase 221: expr_result {:?} was not found in remapper",
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expr_result_id
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));
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}
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} else {
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eprintln!("[cf_loop/joinir] Phase 221: expr_result is None, using fallback");
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}
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} else {
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eprintln!("[cf_loop/joinir] Phase 221: No boundary, using fallback");
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}
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// Fallback: return exit_phi_result_id (for legacy patterns or carrier-only loops)
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if debug && exit_phi_result_id.is_some() {
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eprintln!(
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"[cf_loop/joinir] Phase 221: Returning exit_phi_result_id (fallback): {:?}",
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exit_phi_result_id
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);
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}
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Ok(exit_phi_result_id)
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}
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@ -612,15 +680,11 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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/// Phase 201-A: Accept reserved ValueIds that must not be reused.
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/// These are PHI dst ValueIds that will be created by LoopHeaderPhiBuilder.
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/// We must skip these IDs to prevent carrier value corruption.
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///
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/// Phase 220-C: Pre-populate condition_bindings to use HOST ValueIds directly.
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/// Condition variables should NOT get new allocations - they use HOST values.
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fn remap_values(
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builder: &mut crate::mir::builder::MirBuilder,
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used_values: &std::collections::BTreeSet<ValueId>,
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remapper: &mut crate::mir::builder::joinir_id_remapper::JoinIrIdRemapper,
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reserved_ids: &std::collections::HashSet<ValueId>,
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boundary: Option<&JoinInlineBoundary>,
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debug: bool,
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) -> Result<(), String> {
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if debug {
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@ -628,32 +692,7 @@ fn remap_values(
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used_values.len(), reserved_ids.len());
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}
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// Phase 220-C: Pre-populate condition_bindings BEFORE normal remapping
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// Condition variables use HOST ValueIds directly (no new allocation)
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if let Some(boundary) = boundary {
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for binding in &boundary.condition_bindings {
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remapper.set_value(binding.join_value, binding.host_value);
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 220-C: Condition '{}': JoinIR {:?} → HOST {:?} (no allocation)",
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binding.name, binding.join_value, binding.host_value
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);
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}
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}
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}
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for old_value in used_values {
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// Phase 220-C: Skip if already mapped (e.g., condition_bindings)
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if remapper.get_value(*old_value).is_some() {
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 220-C: Skipping {:?} (already mapped)",
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old_value
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);
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}
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continue;
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}
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// Phase 201-A: Allocate new ValueId, skipping reserved PHI dsts
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let new_value = loop {
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let candidate = builder.next_value_id();
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