From 8f3817f505029e97d28c54548069d5bbaa9d5527 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 23 Nov 2009 16:13:39 +0000
Subject: Fix a use of an invalidated iterator in the case where there are
 multiple adjacent uses of a dead basic block from the same user. This fixes
 PR5596.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89658 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../IPConstantProp/user-with-multiple-uses.ll      | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 test/Transforms/IPConstantProp/user-with-multiple-uses.ll

(limited to 'test/Transforms')

diff --git a/test/Transforms/IPConstantProp/user-with-multiple-uses.ll b/test/Transforms/IPConstantProp/user-with-multiple-uses.ll
new file mode 100644
index 0000000000..402ea41167
--- /dev/null
+++ b/test/Transforms/IPConstantProp/user-with-multiple-uses.ll
@@ -0,0 +1,30 @@
+; RUN: opt < %s -S -ipsccp | FileCheck %s
+; PR5596
+
+; IPSCCP should propagate the 0 argument, eliminate the switch, and propagate
+; the result.
+
+; CHECK: define i32 @main() noreturn nounwind {
+; CHECK-NEXT: entry:
+; CHECK-NEXT: %call2 = tail call i32 @wwrite(i64 0) nounwind
+; CHECK-NEXT: ret i32 123
+
+define i32 @main() noreturn nounwind {
+entry:
+  %call2 = tail call i32 @wwrite(i64 0) nounwind
+  ret i32 %call2
+}
+
+define internal i32 @wwrite(i64 %i) nounwind readnone {
+entry:
+  switch i64 %i, label %sw.default [
+    i64 3, label %return
+    i64 10, label %return
+  ]
+
+sw.default:
+  ret i32 123
+
+return:
+  ret i32 0
+}
-- 
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