Sneaky, sneaky: move the -1 to the outside of the SMax. Reinstate the
optimization of SGE/SLE with unit stride, now that it works properly.
llvm-svn: 60881
diff --git a/llvm/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll b/llvm/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll
new file mode 100644
index 0000000..1e8787d
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll
@@ -0,0 +1,27 @@
+; RUN: llvm-as < %s | opt -analyze -scalar-evolution | grep {0 smax}
+
+define i32 @f(i32 %c.idx.val) {
+
+bb2:
+ %k.018 = add i32 %c.idx.val, -1 ; <i32> [#uses=2]
+ %a14 = icmp slt i32 %k.018, 0 ; <i1> [#uses=1]
+ br i1 %a14, label %bb19, label %bb16.preheader
+
+bb16.preheader:
+ %k.019 = phi i32 [ %k.0, %bb18 ], [ %k.018, %bb2 ] ; <i32> [#uses=5]
+ %x = phi i32 [ 0, %bb2 ], [ %x.1, %bb18]
+ br label %bb18
+
+bb18: ; preds = %bb18.loopexit
+ %x.1 = add i32 %x, 1
+ %k.0 = add i32 %k.019, -1 ; <i32> [#uses=2]
+ %a107 = icmp slt i32 %k.0, 0 ; <i1> [#uses=1]
+ br i1 %a107, label %bb18.bb19_crit_edge, label %bb16.preheader
+
+bb18.bb19_crit_edge:
+ ret i32 %x
+
+bb19:
+ ret i32 0
+
+}