forked from OSchip/llvm-project
27 lines
973 B
LLVM
27 lines
973 B
LLVM
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; REQUIRES: asserts
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; This function contains two tail calls, which should be eliminated
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; RUN: opt < %s -tailcallelim -verify-dom-info -stats -disable-output 2>&1 | grep "2 tailcallelim"
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define i32 @Ack(i32 %M.1, i32 %N.1) {
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entry:
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%tmp.1 = icmp eq i32 %M.1, 0 ; <i1> [#uses=1]
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br i1 %tmp.1, label %then.0, label %endif.0
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then.0: ; preds = %entry
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%tmp.4 = add i32 %N.1, 1 ; <i32> [#uses=1]
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ret i32 %tmp.4
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endif.0: ; preds = %entry
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%tmp.6 = icmp eq i32 %N.1, 0 ; <i1> [#uses=1]
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br i1 %tmp.6, label %then.1, label %endif.1
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then.1: ; preds = %endif.0
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%tmp.10 = add i32 %M.1, -1 ; <i32> [#uses=1]
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%tmp.8 = call i32 @Ack( i32 %tmp.10, i32 1 ) ; <i32> [#uses=1]
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ret i32 %tmp.8
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endif.1: ; preds = %endif.0
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%tmp.13 = add i32 %M.1, -1 ; <i32> [#uses=1]
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%tmp.17 = add i32 %N.1, -1 ; <i32> [#uses=1]
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%tmp.14 = call i32 @Ack( i32 %M.1, i32 %tmp.17 ) ; <i32> [#uses=1]
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%tmp.11 = call i32 @Ack( i32 %tmp.13, i32 %tmp.14 ) ; <i32> [#uses=1]
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ret i32 %tmp.11
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}
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