phase29ao(p40): release adopt pattern3 if-phi subset

src/mir/builder/control_flow/joinir/patterns/router.rs

@@ -392,6 +392,17 @@ pub(crate) fn route_loop_pattern(
                 PlanVerifier::verify(&core_plan)?;
                 return PlanLowerer::lower(builder, core_plan, ctx);
             }
+            if let Some(core_plan) =
+                composer::try_release_adopt_core_plan_for_pattern3_ifphi(
+                    builder,
+                    ctx,
+                    &domain_plan,
+                    &outcome,
+                )?
+            {
+                PlanVerifier::verify(&core_plan)?;
+                return PlanLowerer::lower(builder, core_plan, ctx);
+            }
         }
 
         return lower_via_plan(builder, domain_plan, ctx);

src/mir/builder/control_flow/plan/composer/mod.rs

@@ -12,6 +12,7 @@ use crate::mir::builder::MirBuilder;
 pub(in crate::mir::builder) use shadow_adopt::{
     try_release_adopt_core_plan_for_pattern1,
     try_release_adopt_core_plan_for_pattern2_break_subset,
+    try_release_adopt_core_plan_for_pattern3_ifphi,
     try_release_adopt_core_plan_for_pattern6_scan_with_init,
     try_release_adopt_core_plan_for_pattern7_split_scan,
     try_shadow_adopt_core_plan,

src/mir/builder/control_flow/plan/composer/shadow_adopt.rs

@@ -130,6 +130,32 @@ pub(in crate::mir::builder) fn try_release_adopt_core_plan_for_pattern2_break_su
     }
 }
 
+pub(in crate::mir::builder) fn try_release_adopt_core_plan_for_pattern3_ifphi(
+    builder: &mut MirBuilder,
+    ctx: &LoopPatternContext,
+    domain_plan: &DomainPlan,
+    outcome: &PlanBuildOutcome,
+) -> Result<Option<CorePlan>, String> {
+    if !matches!(domain_plan, DomainPlan::Pattern3IfPhi(_)) {
+        return Ok(None);
+    }
+    if !matches!(outcome.plan.as_ref(), Some(DomainPlan::Pattern3IfPhi(_))) {
+        return Ok(None);
+    }
+
+    let Some(facts) = outcome.facts.as_ref() else {
+        return Ok(None);
+    };
+    if facts.facts.pattern3_ifphi.is_none() {
+        return Ok(None);
+    }
+
+    match compose_coreplan_for_pattern3_ifphi(builder, facts, ctx) {
+        Ok(Some(core)) => Ok(Some(core)),
+        Ok(None) | Err(_) => Ok(None),
+    }
+}
+
 pub(in crate::mir::builder) fn compose_coreplan_for_pattern2_break_subset(
     builder: &mut MirBuilder,
     facts: &CanonicalLoopFacts,