1; RUN: llc -start-after=codegenprepare -stop-before=finalize-isel -o - < %s | FileCheck %s 2; Test for correct placement of DBG_VALUE, which in PR40427 is placed before 3; the load instruction it refers to. The circumstance replicated here is where 4; two instructions in a row, trunc and add, begin with no-op Copy{To,From}Reg 5; SDNodes that produce no instructions. 6; The DBG_VALUE instruction should come immediately after the load instruction 7; because the truncate is optimised out, and the DBG_VALUE should be placed 8; in front of the first instruction that occurs after the dbg.value. 9 10; CHECK: ![[DBGVAR:[0-9]+]] = !DILocalVariable(name: "bees", 11 12target triple = "x86_64-unknown-linux-gnu" 13 14define i16 @lolwat(i1 %spoons, i64 *%bees, i16 %yellow, i64 *%more) { 15entry: 16 br i1 %spoons, label %trueb, label %falseb 17trueb: 18 br label %block 19falseb: 20 br label %block 21block: 22; CHECK: [[PHIREG:%[0-9]+]]:gr64 = PHI %6, %bb.2, %4, %bb.1 23; CHECK-NEXT: [[LOADR:%[0-9]+]]:gr16 = MOV16rm %0 24; CHECK-NEXT: DBG_VALUE [[LOADR]], $noreg, ![[DBGVAR]] 25; CHECK-NEXT: %{{[0-9]+}}:gr32 = IMPLICIT_DEF 26 %foo = phi i64 *[%bees, %trueb], [%more, %falseb] 27 %forks = bitcast i64 *%foo to i32 * 28 %ret = load i32, i32 *%forks, !dbg !6 29 %cast = trunc i32 %ret to i16, !dbg !6 30 call void @llvm.dbg.value(metadata i16 %cast, metadata !1, metadata !DIExpression()), !dbg !6 31 %orly2 = add i16 %yellow, 1 32 br label %bb1 33bb1: 34 %cheese = add i16 %orly2, %cast 35 ret i16 %cheese, !dbg !6 36} 37 38declare void @llvm.dbg.value(metadata, metadata, metadata) 39 40!llvm.module.flags = !{!4} 41!llvm.dbg.cu = !{!2} 42!1 = !DILocalVariable(name: "bees", scope: !5, type: null) 43!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "beards", isOptimized: true, runtimeVersion: 4, emissionKind: FullDebug) 44!3 = !DIFile(filename: "bees.cpp", directory: "") 45!4 = !{i32 2, !"Debug Info Version", i32 3} 46!5 = distinct !DISubprogram(name: "nope", scope: !2, file: !3, line: 1, unit: !2) 47!6 = !DILocation(line: 0, scope: !5) 48!7 = !DILocalVariable(name: "flannel", scope: !5, type: null) 49