Fix PR9331. Simplified version of a patch by Jakub Staszak.

llvm-svn: 127243

1 files changed, 50 insertions, 0 deletions

diff --git a/llvm/test/Transforms/JumpThreading/pr9331.ll b/llvm/test/Transforms/JumpThreading/pr9331.ll
new file mode 100644
index 00000000000..4c06d526ca1
--- /dev/null
+++ b/llvm/test/Transforms/JumpThreading/pr9331.ll
@@ -0,0 +1,50 @@
+; RUN: opt -jump-threading -S < %s
+
+define void @func(i8 zeroext %p_44) nounwind {
+entry:
+  br i1 false, label %for.cond2, label %if.end50
+
+for.cond2:                                        ; preds = %for.inc46, %lor.end, %entry
+  %p_44.addr.1 = phi i8 [ %p_44.addr.1, %lor.end ], [ %p_44, %entry ], [ %p_44.addr.1, %for.inc46 ]
+  br i1 undef, label %for.inc46, label %for.body5
+
+for.body5:                                        ; preds = %for.cond2
+  br i1 undef, label %lbl_465, label %if.then9
+
+if.then9:                                         ; preds = %for.body5
+  br label %return
+
+lbl_465:                                          ; preds = %lbl_465, %for.body5
+  %tobool19 = icmp eq i8 undef, 0
+  br i1 %tobool19, label %if.end21, label %lbl_465
+
+if.end21:                                         ; preds = %lbl_465
+  %conv23 = zext i8 %p_44.addr.1 to i64
+  %xor = xor i64 %conv23, 1
+  %tobool.i = icmp eq i64 %conv23, 0
+  br i1 %tobool.i, label %cond.false.i, label %safe_mod_func_uint64_t_u_u.exit
+
+cond.false.i:                                     ; preds = %if.end21
+  %div.i = udiv i64 %xor, %conv23
+  br label %safe_mod_func_uint64_t_u_u.exit
+
+safe_mod_func_uint64_t_u_u.exit:                  ; preds = %cond.false.i, %if.end21
+  %cond.i = phi i64 [ %div.i, %cond.false.i ], [ %conv23, %if.end21 ]
+  %tobool28 = icmp eq i64 %cond.i, 0
+  br i1 %tobool28, label %lor.rhs, label %lor.end
+
+lor.rhs:                                          ; preds = %safe_mod_func_uint64_t_u_u.exit
+  br label %lor.end
+
+lor.end:                                          ; preds = %lor.rhs, %safe_mod_func_uint64_t_u_u.exit
+  br label %for.cond2
+
+for.inc46:                                        ; preds = %for.cond2
+  br label %for.cond2
+
+if.end50:                                         ; preds = %entry
+  br label %return
+
+return:                                           ; preds = %if.end50, %if.then9
+  ret void
+}