1 ; RUN: opt %s -tailcallelim -pass-remarks=tailcallelim -o /dev/null 2>&1 | FileCheck %s 2 ; RUN: opt %s -o /dev/null -passes='require<opt-remark-emit>,tailcallelim' -pass-remarks=tailcallelim 2>&1 | FileCheck %s 3 4 ; CHECK: /home/davide/pat.c:2:20: transforming tail recursion into loop 5 define i32 @fib(i32 %n) nounwind ssp { 6 entry: 7 %cmp = icmp slt i32 %n, 2 8 br i1 %cmp, label %if.then, label %if.end 9 10 if.then: ; preds = %entry 11 br label %return 12 13 if.end: ; preds = %entry 14 %sub = add nsw i32 %n, -2 15 %call = call i32 @fib(i32 %sub) 16 %sub3 = add nsw i32 %n, -1 17 %call4 = call i32 @fib(i32 %sub3), !dbg !8 18 %add = add nsw i32 %call, %call4 19 br label %return 20 21 return: ; preds = %if.end, %if.then 22 %retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ] 23 ret i32 %retval.0 24 } 25 26 !llvm.dbg.cu = !{!0} 27 !llvm.module.flags = !{!3, !4} 28 !llvm.ident = !{!5} 29 30 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2) 31 !1 = !DIFile(filename: "/home/davide/pat.c", directory: "/tmp") 32 !2 = !{} 33 !3 = !{i32 2, !"Debug Info Version", i32 3} 34 !4 = !{i32 1, !"PIC Level", i32 2} 35 !5 = !{!"clang version 3.9.0 "} 36 !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, retainedNodes: !2) 37 !7 = !DISubroutineType(types: !2) 38 !8 = !DILocation(line: 2, column: 20, scope: !6) 39
