New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10533 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LICM/sink_multiple.ll b/test/Transforms/LICM/sink_multiple.ll
new file mode 100644 (file)
index 0000000..888dfbe
--- /dev/null
+++ b/test/Transforms/LICM/sink_multiple.ll
@@ -0,0 +1,19 @@
+; The loop sinker was running from the bottom of the loop to the top, causing
+; it to miss opportunities to sink instructions that depended on sinking other
+; instructions from the loop.  Instead they got hoisted, which is better than
+; leaving them in the loop, but increases register pressure pointlessly.
+
+; RUN: llvm-as < %s | opt -licm | llvm-dis | grep -C1 getelementptr | grep Out:
+
+%Ty = type { int, int }
+%X = external global %Ty
+
+int %test() {
+        br label %Loop
+Loop:
+        %dead = getelementptr %Ty* %X, long 0, ubyte 0
+        %sunk2 = load int* %dead
+        br bool false, label %Loop, label %Out
+Out:
+        ret int %sunk2
+}