TheOnlyDest = SI->case_begin()->getCaseSuccessor();
}
+ bool Changed = false;
+
// Figure out which case it goes to.
for (auto i = SI->case_begin(), e = SI->case_end(); i != e;) {
// Found case matching a constant operand?
DefaultDest->removePredecessor(ParentBB);
i = SI->removeCase(i);
e = SI->case_end();
+ Changed = true;
if (DTU)
DTU->applyUpdatesPermissive(
{{DominatorTree::Delete, ParentBB, DefaultDest}});
SI->eraseFromParent();
return true;
}
- return false;
+ return Changed;
}
if (auto *IBI = dyn_cast<IndirectBrInst>(T)) {
--- /dev/null
+; RUN: opt -simplifycfg -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @g()
+declare void @f()
+
+define void @foo(i32 %Kind) {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT:entry:
+; CHECK-NEXT: switch i32 %Kind, label %sw.epilog [
+; CHECK-NEXT: i32 15, label %sw.bb2
+; CHECK-NEXT: i32 2, label %sw.bb
+; CHECK-NEXT: ]
+; CHECK: sw.bb:
+; CHECK-NEXT: call void @g()
+; CHECK-NEXT: call void @g()
+; CHECK-NEXT: br label %sw.epilog
+; CHECK: sw.bb2:
+; CHECK-NEXT: call void @f()
+; CHECK-NEXT: br label %sw.epilog
+; CHECK: sw.epilog:
+; CHECK-NEXT: ret void
+; CHECK-NEXT:}
+
+entry:
+ switch i32 %Kind, label %sw.epilog [
+ i32 1, label %sw.epilog
+ i32 2, label %sw.bb
+ i32 15, label %sw.bb2
+ ]
+
+sw.bb:
+ call void @g()
+ call void @g()
+ br label %sw.epilog
+
+sw.bb2:
+ call void @f()
+ br label %sw.epilog
+
+sw.epilog:
+ ret void
+}