[MergeFunctions] Replace all uses of unnamed_addr functions.

This reduces code size for constructs like vtables or interrupt
tables that refer to functions in global initializers.

Differential Revision: https://reviews.llvm.org/D34805

llvm-svn: 315852

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/Transforms/MergeFunc/merge-unnamed-addr-bitcast.ll b/llvm/test/Transforms/MergeFunc/merge-unnamed-addr-bitcast.ll
new file mode 100644
index 00000000000..3cefc3eb819
--- /dev/null
+++ b/llvm/test/Transforms/MergeFunc/merge-unnamed-addr-bitcast.ll
@@ -0,0 +1,30 @@
+; RUN: opt -S -mergefunc < %s | FileCheck %s
+
+%A = type { i32 }
+%B = type { i32 }
+
+; CHECK-NOT: @b
+
+@x = constant { i32 (i32)*, i32 (i32)* }
+  { i32 (i32)* bitcast (i32 (%A)* @a to i32 (i32)*),
+    i32 (i32)* bitcast (i32 (%B)* @b to i32 (i32)*) }
+; CHECK: { i32 (i32)* bitcast (i32 (%A)* @a to i32 (i32)*), i32 (i32)* bitcast (i32 (%A)* @a to i32 (i32)*) }
+
+define internal i32 @a(%A) unnamed_addr {
+  extractvalue %A %0, 0
+  xor i32 %2, 0
+  ret i32 %3
+}
+
+define internal i32 @b(%B) unnamed_addr {
+  extractvalue %B %0, 0
+  xor i32 %2, 0
+  ret i32 %3
+}
+
+define i32 @c(i32) {
+  insertvalue %B undef, i32 %0, 0
+  call i32 @b(%B %2)
+; CHECK: call i32 bitcast (i32 (%A)* @a to i32 (%B)*)(%B %2)
+  ret i32 %3
+}