TransformUtils: Introduce module splitter.

The module splitter splits a module into linkable partitions. It will
be used to implement parallel LTO code generation.

This initial version of the splitter does not attempt to deal with the
somewhat subtle symbol visibility issues around module splitting. These
will be dealt with in a future change.

Differential Revision: http://reviews.llvm.org/D12132

llvm-svn: 245662

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-split/unnamed.ll b/llvm/test/tools/llvm-split/unnamed.ll
new file mode 100644
index 00000000000..96a7fe4e1b7
--- /dev/null
+++ b/llvm/test/tools/llvm-split/unnamed.ll
@@ -0,0 +1,31 @@
+; RUN: llvm-split -o %t %s
+; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
+; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
+
+; CHECK0: declare hidden void @__llvmsplit_unnamed()
+; CHECK1: define hidden void @__llvmsplit_unnamed()
+define internal void @0() {
+  ; CHECK1: call void @foo()
+  call void @foo()
+  ret void
+}
+
+; CHECK0: declare hidden void @__llvmsplit_unnamed1()
+; CHECK1: define hidden void @__llvmsplit_unnamed1()
+define internal void @1() {
+  ; CHECK1: call void @foo()
+  ; CHECK1: call void @foo()
+  call void @foo()
+  call void @foo()
+  ret void
+}
+
+; CHECK0: define void @foo()
+; CHECK1: declare void @foo()
+define void @foo() {
+  ; CHECK0: call void @__llvmsplit_unnamed1()
+  ; CHECK0: call void @__llvmsplit_unnamed()
+  call void @1()
+  call void @0()
+  ret void
+}