forked from OSchip/llvm-project
27 lines
769 B
LLVM
27 lines
769 B
LLVM
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; RUN: opt -tailcallelim -S < %s 2>&1 | FileCheck %s
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; CHECK: add nsw i32
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; CHECK-NEXT: br label
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; CHECK: add nsw i32
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; CHECK-NEXT: br label
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; CHECK-NOT: Uses remain when a value is destroyed
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define i32 @test(i32 %n) {
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entry:
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%cmp = icmp slt i32 %n, 2
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br i1 %cmp, label %if.then, label %if.else
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if.then: ; preds = %entry
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%v1 = add nsw i32 %n, -2
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%call1 = tail call i32 @test(i32 %v1)
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br label %return
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if.else: ; preds = %entry
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%v2 = add nsw i32 %n, 4
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%call2 = tail call i32 @test(i32 %v2)
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br label %return
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return: ; preds = %if.end, %if.else
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%retval = phi i32 [ %call1, %if.then ], [ %call2, %if.else ]
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ret i32 %retval
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}
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