9a05a89d1e
After https://reviews.llvm.org/D81730: `SpeculativeExecutionPass::considerHoistingFromTo` hoists instructions, including debug intrinsics, as long as none of their used values are instructions that appear prior in the block that are not being hoisted. This behaviour has been duplicated for DPValues to get rid of a binary difference. The correct solution is not hoist these debug values at all, whichever format they're in.
90 lines
3.6 KiB
LLVM
90 lines
3.6 KiB
LLVM
; RUN: opt < %s -S -passes='speculative-execution' | FileCheck %s
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; RUN: opt --try-experimental-debuginfo-iterators < %s -S -passes='speculative-execution' | FileCheck %s
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%class.B = type { ptr }
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; Testing that two bitcasts are not hoisted to the first BB
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define ptr @foo(ptr readonly %b) {
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; CHECK-LABEL: foo
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; CHECK-LABEL: entry
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; CHECK-NEXT: %i = icmp eq ptr %b, null
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; CHECK-NEXT: br i1 %i, label %end, label %notnull
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entry:
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%i = icmp eq ptr %b, null
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br i1 %i, label %end, label %notnull
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; CHECK-LABEL: notnull:
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notnull: ; preds = %entry
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%vtable = load ptr, ptr %b, align 8
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%i2 = getelementptr inbounds i32, ptr %vtable, i64 -2
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%offset.to.top = load i32, ptr %i2, align 4
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%i4 = sext i32 %offset.to.top to i64
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%i5 = getelementptr inbounds i8, ptr %b, i64 %i4
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br label %end
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end: ; preds = %notnull, %entry
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%i6 = phi ptr [ %i5, %notnull ], [ null, %entry ]
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ret ptr %i6
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}
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define void @f(i32 %i) {
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entry:
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; CHECK-LABEL: @f(
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; CHECK: %a2 = add i32 %i, 0
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br i1 undef, label %land.rhs, label %land.end
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land.rhs: ; preds = %entry
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; CHECK: land.rhs:
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; CHECK-NEXT: call void @llvm.dbg.label
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; CHECK-NEXT: %y = alloca i32, align 4
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; CHECK-NEXT: call void @llvm.dbg.declare(metadata ptr %y
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; CHECK-NEXT: %a0 = load i32, ptr undef, align 1
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %a0
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; CHECK-NEXT: call void @llvm.dbg.label
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %a2
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call void @llvm.dbg.label(metadata !11), !dbg !10
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%y = alloca i32, align 4
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call void @llvm.dbg.declare(metadata ptr %y, metadata !14, metadata !DIExpression()), !dbg !10
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%a0 = load i32, ptr undef, align 1
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call void @llvm.dbg.value(metadata i32 %a0, metadata !9, metadata !DIExpression()), !dbg !10
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;; RemoveDIs: Check a label that is attached to a hoisted instruction
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;; gets left behind (match intrinsic-style debug info behaviour).
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call void @llvm.dbg.label(metadata !15), !dbg !10
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%a2 = add i32 %i, 0
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call void @llvm.dbg.value(metadata i32 %a2, metadata !13, metadata !DIExpression()), !dbg !10
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br label %land.end
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land.end: ; preds = %land.rhs, %entry
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ret void
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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declare void @llvm.dbg.label(metadata)
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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attributes #1 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "foo.c", directory: "/bar")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !7, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !DILocalVariable(name: "a0", scope: !6, file: !1, line: 3, type: !4)
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!10 = !DILocation(line: 0, scope: !6)
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!11 = !DILabel(scope: !6, name: "label", file: !1, line: 1)
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!12 = !DILocalVariable(name: "x", scope: !6, file: !1, line: 3, type: !4)
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!13 = !DILocalVariable(name: "a2", scope: !6, file: !1, line: 3, type: !4)
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!14 = !DILocalVariable(name: "y", scope: !6, file: !1, line: 3, type: !4)
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!15 = !DILabel(scope: !6, name: "label2", file: !1, line: 2)
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