c65b4d64d4
Alignment of an alloca in IR can be lower than the preferred alignment on purpose, but this override essentially treats the preferred alignment as the minimum alignment. The patch changes this behavior to always use the specified alignment. If alignment is not set explicitly in LLVM IR, it is set to DL.getPrefTypeAlign(Ty) in computeAllocaDefaultAlign. Tests are changed as well: explicit alignment is increased to match the preferred alignment if it changes output, or omitted when it is hard to determine the right value (e.g. for pointers, some structs, or weird types). Differential Revision: https://reviews.llvm.org/D135462
63 lines
2.5 KiB
LLVM
63 lines
2.5 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; RUN: llc < %s -filetype=obj | llvm-dwarfdump -v - --debug-info | FileCheck %s --check-prefix=DWARF
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; This should use the frame index side table for allocas, not DBG_VALUE
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; instructions. For SDAG ISel, this test would see an SDNode materializing the
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; argument to escape_foo and we'd get DBG_VALUE MachineInstr.
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; CHECK-LABEL: use_dbg_declare:
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; CHECK-NOT: #DEBUG_VALUE
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; DWARF: DW_TAG_variable
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; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +0)
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}} = "o")
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64--linux"
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind uwtable
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define void @use_dbg_declare() #0 !dbg !7 {
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entry:
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%o = alloca %struct.Foo, align 8
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call void @llvm.dbg.declare(metadata ptr %o, metadata !10, metadata !15), !dbg !16
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call void @escape_foo(ptr %o), !dbg !17
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ret void, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @escape_foo(ptr)
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attributes #0 = { noinline nounwind uwtable }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 6.0.0 "}
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!7 = distinct !DISubprogram(name: "use_dbg_declare", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !11)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIExpression()
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!16 = !DILocation(line: 4, column: 14, scope: !7)
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!17 = !DILocation(line: 5, column: 3, scope: !7)
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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