Vendor import of llvm RELEASE_360/rc1 tag r226102 (effectively, 3.6.0 RC1):vendor/llvm/llvm-release_360-r226102

https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_360/rc1@226102

1 files changed, 26 insertions, 0 deletions

diff --git a/test/Transforms/TailCallElim/EraseBB.ll b/test/Transforms/TailCallElim/EraseBB.ll
new file mode 100644
index 000000000000..c8290d7ea951
--- /dev/null
+++ b/test/Transforms/TailCallElim/EraseBB.ll
@@ -0,0 +1,26 @@
+; RUN: opt -tailcallelim -S < %s 2>&1 | FileCheck %s
+
+; CHECK: add nsw i32
+; CHECK-NEXT: br label
+; CHECK: add nsw i32
+; CHECK-NEXT: br label
+; CHECK-NOT: Uses remain when a value is destroyed
+define i32 @test(i32 %n) {
+entry:
+  %cmp = icmp slt i32 %n, 2
+  br i1 %cmp, label %if.then, label %if.else
+
+if.then:                                          ; preds = %entry
+  %v1 = add nsw i32 %n, -2
+  %call1 = tail call i32 @test(i32 %v1)
+  br label %return
+
+if.else:                                          ; preds = %entry
+  %v2 = add nsw i32 %n, 4
+  %call2 = tail call i32 @test(i32 %v2)
+  br label %return
+
+return:                                           ; preds = %if.end, %if.else
+  %retval = phi i32 [ %call1, %if.then ], [ %call2, %if.else ]
+  ret i32 %retval
+}