diff --git a/llvm/test/Transforms/TailCallElim/opt-remarks-recursion.ll b/llvm/test/Transforms/TailCallElim/opt-remarks-recursion.ll new file mode 100644 index 000000000000..c290f795854f --- /dev/null +++ b/llvm/test/Transforms/TailCallElim/opt-remarks-recursion.ll @@ -0,0 +1,39 @@ +; RUN: opt %s -tailcallelim -pass-remarks=tailcallelim -o /dev/null 2>&1 | FileCheck %s +; RUN: opt %s -o /dev/null -passes='require,tailcallelim' -pass-remarks=tailcallelim 2>&1 | FileCheck %s + +; CHECK: /home/davide/pat.c:2:20: marked as tail call candidate +; CHECK: /home/davide/pat.c:2:20: transforming tail recursion into loop +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), !dbg !8 + %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 +} + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2) +!1 = !DIFile(filename: "/home/davide/pat.c", directory: "/tmp") +!2 = !{} +!3 = !{i32 2, !"Debug Info Version", i32 3} +!4 = !{i32 1, !"PIC Level", i32 2} +!5 = !{!"clang version 3.9.0 "} +!6 = distinct !DISubprogram(name: "success", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2) +!7 = !DISubroutineType(types: !2) +!8 = !DILocation(line: 2, column: 20, scope: !6)