| Davide Italiano | 1985e9b | 2017-07-19 21:39:51 +0000 | [diff] [blame^] | 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: marked as tail call candidate |
| 5 | ; CHECK: /home/davide/pat.c:2:20: transforming tail recursion into loop |
| 6 | define i32 @fib(i32 %n) nounwind ssp { |
| 7 | entry: |
| 8 | %cmp = icmp slt i32 %n, 2 |
| 9 | br i1 %cmp, label %if.then, label %if.end |
| 10 | |
| 11 | if.then: ; preds = %entry |
| 12 | br label %return |
| 13 | |
| 14 | if.end: ; preds = %entry |
| 15 | %sub = add nsw i32 %n, -2 |
| 16 | %call = call i32 @fib(i32 %sub) |
| 17 | %sub3 = add nsw i32 %n, -1 |
| 18 | %call4 = call i32 @fib(i32 %sub3), !dbg !8 |
| 19 | %add = add nsw i32 %call, %call4 |
| 20 | br label %return |
| 21 | |
| 22 | return: ; preds = %if.end, %if.then |
| 23 | %retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ] |
| 24 | ret i32 %retval.0 |
| 25 | } |
| 26 | |
| 27 | !llvm.dbg.cu = !{!0} |
| 28 | !llvm.module.flags = !{!3, !4} |
| 29 | !llvm.ident = !{!5} |
| 30 | |
| 31 | !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2) |
| 32 | !1 = !DIFile(filename: "/home/davide/pat.c", directory: "/tmp") |
| 33 | !2 = !{} |
| 34 | !3 = !{i32 2, !"Debug Info Version", i32 3} |
| 35 | !4 = !{i32 1, !"PIC Level", i32 2} |
| 36 | !5 = !{!"clang version 3.9.0 "} |
| 37 | !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) |
| 38 | !7 = !DISubroutineType(types: !2) |
| 39 | !8 = !DILocation(line: 2, column: 20, scope: !6) |