Add an LLVM IR version of code sinking. This uses the same simple algorithm
as MachineSink, but it isn't constrained by MachineInstr-level details.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103257 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/Sink/basic.ll b/test/Transforms/Sink/basic.ll
new file mode 100644
index 0000000..beb9481
--- /dev/null
+++ b/test/Transforms/Sink/basic.ll
@@ -0,0 +1,22 @@
+; RUN: opt < %s -sink -S | FileCheck %s
+
+@A = external global i32
+@B = external global i32
+
+; Sink should sink the load past the store (which doesn't overlap) into
+; the block that uses it.
+
+; CHECK: @foo
+; CHECK: true:
+; CHECK-NEXT: %l = load i32* @A
+; CHECK-NEXT: ret i32 %l
+
+define i32 @foo(i1 %z) {
+ %l = load i32* @A
+ store i32 0, i32* @B
+ br i1 %z, label %true, label %false
+true:
+ ret i32 %l
+false:
+ ret i32 0
+}