Don't replace an alias in llvm.used with its target.

When we replace an internal alias with its target, be careful not to
replace the entry in llvm.used (and llvm.compiler_used).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181524 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 42 insertions, 0 deletions

diff --git a/test/Transforms/GlobalOpt/alias-used.ll b/test/Transforms/GlobalOpt/alias-used.ll
new file mode 100644
index 0000000..f91579b
--- /dev/null
+++ b/test/Transforms/GlobalOpt/alias-used.ll
@@ -0,0 +1,42 @@
+; RUN: opt < %s -globalopt -S | FileCheck %s
+
+@c = global i8 42
+
+@llvm.used = appending global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca], section "llvm.metadata"
+; CHECK: @llvm.used = appending global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca], section "llvm.metadata"
+
+@llvm.compiler_used = appending global [2 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @fa3 to i8*)], section "llvm.metadata"
+
+@sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca]
+; CHECK: @sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @f to i8*), i8* bitcast (void ()* @f to i8*), i8* @c]
+
+@other = global i32* bitcast (void ()* @fa to i32*)
+; CHECK: @other = global i32* bitcast (void ()* @f to i32*)
+
+@fa = alias internal void ()* @f
+; CHECK: @fa = alias internal void ()* @f
+
+@fa2 = alias internal void ()* @f
+; CHECK-NOT: @fa2
+
+@fa3 = alias internal void ()* @f
+; CHECK: @fa3
+
+@ca = alias internal i8* @c
+; CHECK: @ca = alias internal i8* @c
+
+define void @f() {
+  ret void
+}
+
+define i8* @g() {
+  ret i8* bitcast (void ()* @fa to i8*);
+}
+
+define i8* @g2() {
+  ret i8* bitcast (void ()* @fa2 to i8*);
+}
+
+define i8* @h() {
+  ret i8* @ca
+}