| ; RUN: opt %s -tailcallelim -verify-dom-info -pass-remarks=tailcallelim -o /dev/null 2>&1 | FileCheck %s |
| ; RUN: opt %s -o /dev/null -passes='require<opt-remark-emit>,tailcallelim' -pass-remarks=tailcallelim 2>&1 | FileCheck %s |
| |
| ; 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, retainedNodes: !2) |
| !7 = !DISubroutineType(types: !2) |
| !8 = !DILocation(line: 2, column: 20, scope: !6) |