diff options
Diffstat (limited to 'test/Transforms/TailCallElim/dup_tail.ll')
| -rw-r--r-- | test/Transforms/TailCallElim/dup_tail.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/test/Transforms/TailCallElim/dup_tail.ll b/test/Transforms/TailCallElim/dup_tail.ll new file mode 100644 index 0000000000..f5b87f2764 --- /dev/null +++ b/test/Transforms/TailCallElim/dup_tail.ll @@ -0,0 +1,26 @@ +; REQUIRES: asserts +; Duplicate the return into if.end to enable TCE. +; RUN: opt -tailcallelim -stats -disable-output < %s 2>&1 | FileCheck %s + +; CHECK: Number of return duplicated + +define i32 @fib(i32 %n) nounwind ssp { +entry: + %cmp = icmp slt i32 %n, 2 + br i1 %cmp, label %if.then, label %if.end + +if.then: ; preds = %entry + br label %return + +if.end: ; preds = %entry + %sub = add nsw i32 %n, -2 + %call = call i32 @fib(i32 %sub) + %sub3 = add nsw i32 %n, -1 + %call4 = call i32 @fib(i32 %sub3) + %add = add nsw i32 %call, %call4 + br label %return + +return: ; preds = %if.end, %if.then + %retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ] + ret i32 %retval.0 +} |