Add new SCEV, SCEVSMax. This allows LLVM to analyze do-while loops.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44319 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/ScalarEvolution/do-loop.ll b/test/Analysis/ScalarEvolution/do-loop.ll
new file mode 100644
index 0000000..c6b3298
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/do-loop.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | opt -analyze -scalar-evolution | grep smax
+; PR1614
+
+define i32 @f(i32 %x, i32 %y) {
+entry:
+ br label %bb
+
+bb: ; preds = %bb, %entry
+ %indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=2]
+ %x_addr.0 = add i32 %indvar, %x ; <i32> [#uses=1]
+ %tmp2 = add i32 %x_addr.0, 1 ; <i32> [#uses=2]
+ %tmp5 = icmp slt i32 %tmp2, %y ; <i1> [#uses=1]
+ %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
+ br i1 %tmp5, label %bb, label %bb7
+
+bb7: ; preds = %bb
+ ret i32 %tmp2
+}