SILOptimizer: Disable PackSpecialization pass to unblock SWBs

aidan-hall · aidan-hall · commit 305a5efaef49 · 2025-11-17T17:38:13.000Z
rdar://164515160
diff --git a/lib/SILOptimizer/PassManager/PassPipeline.cpp b/lib/SILOptimizer/PassManager/PassPipeline.cpp
@@ -527,7 +527,7 @@ void addFunctionPasses(SILPassPipelinePlan &P,
   // of embedded Swift.
   if (!P.getOptions().EmbeddedSwift) {
     P.addGenericSpecializer();
-    P.addPackSpecialization();
+    // P.addPackSpecialization();
     // Run devirtualizer after the specializer, because many
     // class_method/witness_method instructions may use concrete types now.
     P.addDevirtualizer();
diff --git a/test/SILOptimizer/pack_specialization.swift b/test/SILOptimizer/pack_specialization.swift
@@ -1,3 +1,4 @@
+// XFAIL: *
 // RUN: %target-swift-frontend %s -emit-ir -O | %FileCheck %s
 
 // REQUIRES: swift_in_compiler

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+// XFAIL: *`
`1`	`2`	`// RUN: %target-swift-frontend %s -emit-ir -O \| %FileCheck %s`
`2`	`3`
`3`	`4`	`// REQUIRES: swift_in_compiler`