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35 lines
836 B
LLVM
35 lines
836 B
LLVM
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; RUN: opt %s -tailcallelim -S | FileCheck %s
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define i64 @fib(i64 %n) nounwind readnone {
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; CHECK: @fib
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entry:
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; CHECK: tailrecurse:
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; CHECK: %accumulator.tr = phi i64 [ %n, %entry ], [ %3, %bb1 ]
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; CHECK: %n.tr = phi i64 [ %n, %entry ], [ %2, %bb1 ]
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switch i64 %n, label %bb1 [
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; CHECK: switch i64 %n.tr, label %bb1 [
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i64 0, label %bb2
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i64 1, label %bb2
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]
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bb1:
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; CHECK: bb1:
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%0 = add i64 %n, -1
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; CHECK: %0 = add i64 %n.tr, -1
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%1 = tail call i64 @fib(i64 %0) nounwind
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; CHECK: %1 = tail call i64 @fib(i64 %0)
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%2 = add i64 %n, -2
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; CHECK: %2 = add i64 %n.tr, -2
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%3 = tail call i64 @fib(i64 %2) nounwind
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; CHECK-NOT: tail call i64 @fib
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%4 = add nsw i64 %3, %1
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; CHECK: add nsw i64 %accumulator.tr, %1
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ret i64 %4
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; CHECK: br label %tailrecurse
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bb2:
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; CHECK: bb2:
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ret i64 %n
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; CHECK: ret i64 %accumulator.tr
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}
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