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1; RUN: llc %s -o - | FileCheck %s2 3;; This test has had source-locations removed from the prologue, to simulate4;; heavily-optimised scenarios where a lot of debug-info gets dropped. Check5;; that we can pick a "worst-case" prologue_end position, of the first6;; instruction that does any meaningful computation (the add). It's better to7;; put the prologue_end flag here rather than deeper into the loop, past the8;; early-exit check.9;;10;; Generated from this code at -O2 -g in clang, with source locations then11;; deleted.12;;13;; int glob = 0;14;; int foo(int arg, int sum) {15;; arg += sum;16;; while (arg) {17;; glob--;18;; arg %= glob;19;; }20;; return 0;21;; }22 23; CHECK-LABEL: foo:24;; Scope-line location:25; CHECK: .loc 0 2 026;; Entry block:27; CHECK: movl %edi, %edx28; CHECK-NEXT: .loc 0 2 0 prologue_end29; CHECK-NEXT: addl %esi, %edx30; CHECK-NEXT: je .LBB0_431; CHECK-LABEL: # %bb.1:32 33target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"34target triple = "x86_64-unknown-linux-gnu"35 36@glob = dso_local local_unnamed_addr global i32 0, align 4, !dbg !037 38define dso_local noundef i32 @foo(i32 noundef %arg, i32 noundef %sum) local_unnamed_addr !dbg !9 {39entry:40 %add = add nsw i32 %sum, %arg41 %tobool.not4 = icmp eq i32 %add, 042 br i1 %tobool.not4, label %while.end, label %while.body.preheader43 44while.body.preheader:45 %glob.promoted = load i32, ptr @glob, align 446 br label %while.body, !dbg !1447 48while.body:49 %arg.addr.06 = phi i32 [ %rem, %while.body ], [ %add, %while.body.preheader ]50 %dec35 = phi i32 [ %dec, %while.body ], [ %glob.promoted, %while.body.preheader ]51 %dec = add nsw i32 %dec35, -1, !dbg !1552 %rem = srem i32 %arg.addr.06, %dec, !dbg !1753 %tobool.not = icmp eq i32 %rem, 0, !dbg !1454 br i1 %tobool.not, label %while.cond.while.end_crit_edge, label %while.body, !dbg !1455 56while.cond.while.end_crit_edge:57 store i32 %dec, ptr @glob, align 4, !dbg !1558 br label %while.end, !dbg !1459 60while.end:61 ret i32 0, !dbg !1862}63 64!llvm.dbg.cu = !{!2}65!llvm.module.flags = !{!6, !7}66!llvm.ident = !{!8}67 68!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())69!1 = distinct !DIGlobalVariable(name: "glob", scope: !2, file: !3, line: 1, type: !5, isLocal: false, isDefinition: true)70!2 = distinct !DICompileUnit(language: DW_LANG_C11, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)71!3 = !DIFile(filename: "foo.c", directory: "")72!4 = !{!0}73!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)74!6 = !{i32 7, !"Dwarf Version", i32 5}75!7 = !{i32 2, !"Debug Info Version", i32 3}76!8 = !{!"clang"}77!9 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 2, type: !10, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !12)78!10 = !DISubroutineType(types: !11)79!11 = !{!5, !5, !5}80!12 = !{}81!13 = !DILocation(line: 3, column: 7, scope: !9)82!14 = !DILocation(line: 4, column: 3, scope: !9)83!15 = !DILocation(line: 5, column: 9, scope: !16)84!16 = distinct !DILexicalBlock(scope: !9, file: !3, line: 4, column: 15)85!17 = !DILocation(line: 6, column: 9, scope: !16)86!18 = !DILocation(line: 8, column: 3, scope: !9)87