Fix an infinite alternation in JumpThreading where two transforms would repeatedly undo each other. The solution is to perform more aggressive constant folding to make one of the edges just folded away rather than trying to thread it.

Fixes <rdar://problem/9284786>.

Discovered with CSmith.

llvm-svn: 129538

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/test/Transforms/JumpThreading/2011-04-14-InfLoop.ll b/llvm/test/Transforms/JumpThreading/2011-04-14-InfLoop.ll
new file mode 100644
index 00000000000..46aaa00380e
--- /dev/null
+++ b/llvm/test/Transforms/JumpThreading/2011-04-14-InfLoop.ll
@@ -0,0 +1,31 @@
+; RUN: opt -jump-threading < %s
+; <rdar://problem/9284786>
+
+%0 = type <{ i64, i16, i64, i8, i8 }>
+
+@g_338 = external global %0, align 8
+
+define void @func_1() nounwind ssp {
+entry:
+  ret void
+
+for.cond1177:
+  %inc1187 = add nsw i32 0, 1
+  %cmp1179 = icmp slt i32 %inc1187, 5
+  br i1 %cmp1179, label %for.cond1177, label %land.rhs1320
+
+land.rhs1320:
+  %tmp1324 = volatile load i64* getelementptr inbounds (%0* @g_338, i64 0, i32 2), align 1, !tbaa !0
+  br label %if.end.i
+
+if.end.i:
+  %tobool.pr.i = phi i1 [ false, %if.end.i ], [ false, %land.rhs1320 ]
+  br i1 %tobool.pr.i, label %return, label %if.end.i
+
+return:
+  ret void
+}
+
+!0 = metadata !{metadata !"long long", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA", null}