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116 lines
4.7 KiB
116 lines
4.7 KiB
4 months ago
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; RUN: llc -run-pass=machinelicm -o - %s | FileCheck %s
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; Line numbers should not be retained when loop invariant instructions are hoisted.
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; Doing so causes poor stepping bevavior.
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;
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; Created from:
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; int x;
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; void Process(const unsigned int *p)
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; {
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; while (1)
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; x = *p++;
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; }
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;
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; with clang -emit-llvm -S -O2 -g -o t.ll t.c
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; llc -relocation-model=pic -stop-after=machine-combine -O2 t.ll -o t.mir
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;
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; We check that when the machine loop invariant pass hoists instructions
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; out of a loop the debug information is not retained.
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;
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; CHECK-LABEL: bb.0.entry:
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; CHECK: MOV64rm $rip, 1, $noreg, target-flags(x86-gotpcrel) @x, $noreg :: (load 8 from got)
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; CHECK-LABEL: bb.1.while.body:
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;
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; ModuleID = 'tx.ll'
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source_filename = "t.c"
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target triple = "x86_64-unknown-linux-gnu"
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@x = common local_unnamed_addr global i32 0, align 4, !dbg !0
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; Function Attrs: noreturn nounwind uwtable
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define void @Process(i32* nocapture readonly %p) local_unnamed_addr !dbg !9 {
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entry:
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tail call void @llvm.dbg.value(metadata i32* %p, i64 0, metadata !16, metadata !17), !dbg !18
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br label %while.body, !dbg !19
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while.body: ; preds = %while.body, %entry
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%p.addr.0 = phi i32* [ %p, %entry ], [ %incdec.ptr, %while.body ]
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tail call void @llvm.dbg.value(metadata i32* %p.addr.0, i64 0, metadata !16, metadata !17), !dbg !18
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%incdec.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 1, !dbg !20
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tail call void @llvm.dbg.value(metadata i32* %incdec.ptr, i64 0, metadata !16, metadata !17), !dbg !18
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%0 = load i32, i32* %p.addr.0, align 4, !dbg !21, !tbaa !22
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store i32 %0, i32* @x, align 4, !dbg !26, !tbaa !22
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br label %while.body, !dbg !27, !llvm.loop !29
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!6, !7}
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!llvm.ident = !{!8}
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!0 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true), expr: !DIExpression())
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 4.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
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!2 = !DIFile(filename: "t.c", directory: "/home/test")
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!3 = !{}
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!4 = !{!0}
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!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{!"clang version 4.0.0 "}
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!9 = distinct !DISubprogram(name: "Process", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !15)
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!10 = !DISubroutineType(types: !11)
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!11 = !{null, !12}
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
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!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14)
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!14 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!15 = !{!16}
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!16 = !DILocalVariable(name: "p", arg: 1, scope: !9, file: !2, line: 2, type: !12)
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!17 = !DIExpression()
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!18 = !DILocation(line: 2, column: 34, scope: !9)
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!19 = !DILocation(line: 4, column: 3, scope: !9)
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!20 = !DILocation(line: 5, column: 11, scope: !9)
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!21 = !DILocation(line: 5, column: 9, scope: !9)
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!22 = !{!23, !23, i64 0}
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!23 = !{!"int", !24, i64 0}
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!24 = !{!"omnipotent char", !25, i64 0}
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!25 = !{!"C++"}
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!26 = !DILocation(line: 5, column: 7, scope: !9)
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!27 = !DILocation(line: 4, column: 3, scope: !28)
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!28 = !DILexicalBlockFile(scope: !9, file: !2, discriminator: 1)
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!29 = distinct !{!29, !19, !20}
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...
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---
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name: Process
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr64 }
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- { id: 1, class: gr64 }
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- { id: 2, class: gr64 }
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- { id: 3, class: gr32 }
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- { id: 4, class: gr64 }
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body: |
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bb.0.entry:
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successors: %bb.1.while.body(0x80000000)
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liveins: $rdi
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DBG_VALUE $rdi, _, !16, !17, debug-location !18
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%2 = COPY $rdi
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DBG_VALUE %2, _, !16, !17, debug-location !18
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bb.1.while.body:
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successors: %bb.1.while.body(0x80000000)
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%0 = PHI %2, %bb.0.entry, %1, %bb.1.while.body
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DBG_VALUE %0, _, !16, !17, debug-location !18
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%1 = ADD64ri8 %0, 4, implicit-def dead $eflags, debug-location !20
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DBG_VALUE %1, _, !16, !17, debug-location !18
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%3 = MOV32rm %0, 1, _, 0, _, debug-location !21 :: (load 4 from %ir.p.addr.0, !tbaa !22)
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%4 = MOV64rm $rip, 1, _, target-flags(x86-gotpcrel) @x, _, debug-location !26 :: (load 8 from got)
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MOV32mr killed %4, 1, _, 0, _, killed %3, debug-location !26 :: (store 4 into @x, !tbaa !22)
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JMP_1 %bb.1.while.body, debug-location !27
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...
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