1 files changed, 69 insertions, 0 deletions
diff --git a/test/CodeGen/X86/early-ifcvt.ll b/test/CodeGen/X86/early-ifcvt.ll
new file mode 100644
index 000000000000..7883ffabd565
--- /dev/null
+++ b/test/CodeGen/X86/early-ifcvt.ll
@@ -0,0 +1,69 @@
+; RUN: llc < %s -enable-early-ifcvt -stress-early-ifcvt | FileCheck %s
+target triple = "x86_64-apple-macosx10.8.0"
+
+; CHECK: mm2
+define i32 @mm2(i32* nocapture %p, i32 %n) nounwind uwtable readonly ssp {
+entry:
+  br label %do.body
+
+; CHECK: do.body
+; Loop body has no branches before the backedge.
+; CHECK-NOT: LBB
+do.body:
+  %max.0 = phi i32 [ 0, %entry ], [ %max.1, %do.cond ]
+  %min.0 = phi i32 [ 0, %entry ], [ %min.1, %do.cond ]
+  %n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %do.cond ]
+  %p.addr.0 = phi i32* [ %p, %entry ], [ %incdec.ptr, %do.cond ]
+  %incdec.ptr = getelementptr inbounds i32* %p.addr.0, i64 1
+  %0 = load i32* %p.addr.0, align 4
+  %cmp = icmp sgt i32 %0, %max.0
+  br i1 %cmp, label %do.cond, label %if.else
+
+if.else:
+  %cmp1 = icmp slt i32 %0, %min.0
+  %.min.0 = select i1 %cmp1, i32 %0, i32 %min.0
+  br label %do.cond
+
+do.cond:
+  %max.1 = phi i32 [ %0, %do.body ], [ %max.0, %if.else ]
+  %min.1 = phi i32 [ %min.0, %do.body ], [ %.min.0, %if.else ]
+; CHECK: decl %esi
+; CHECK: jne LBB
+  %dec = add i32 %n.addr.0, -1
+  %tobool = icmp eq i32 %dec, 0
+  br i1 %tobool, label %do.end, label %do.body
+
+do.end:
+  %sub = sub nsw i32 %max.1, %min.1
+  ret i32 %sub
+}
+
+; CHECK: multipreds
+; Deal with alternative tail predecessors
+; CHECK-NOT: LBB
+; CHECK: cmov
+; CHECK-NOT: LBB
+; CHECK: cmov
+; CHECK-NOT: LBB
+; CHECK: fprintf
+
+define void @multipreds(i32 %sw) nounwind uwtable ssp {
+entry:
+  switch i32 %sw, label %if.then29 [
+    i32 0, label %if.then37
+    i32 127, label %if.end41
+  ]
+
+if.then29:
+  br label %if.end41
+
+if.then37:
+  br label %if.end41
+
+if.end41:
+  %exit_status.0 = phi i32 [ 2, %if.then29 ], [ 0, %if.then37 ], [ 66, %entry ]
+  call void (...)* @fprintf(i32 %exit_status.0) nounwind
+  unreachable
+}
+
+declare void @fprintf(...) nounwind