2019-06-19 08:25:39 +08:00
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; RUN: llc -mtriple=x86_64-unknown-unknown -start-after=codegenprepare -stop-before=finalize-isel %s -o - | FileCheck %s
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2019-02-13 21:37:33 +08:00
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; Test the movement of dbg.values of arguments. SelectionDAG tries to be
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; helpful and places DBG_VALUEs of Arguments at the start of functions.
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; Unfortunately, this doesn't necessarily make sense, as one can specify an
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; Argument IR Value as a variable location anywhere in the program.
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;
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; Distinguish cases where we want to hoist DBG_VALUEs, and those where we
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; don't, by whether the referred to variable is a parameter to the current
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; function. In the test below, 'xyzzy' is a parameter to an inlined function,
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; but should not be hoisted to the start of the function.
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;
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; Original test case, in which 'xyzzy' became unavailable because its DBG_VALUE
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; landed far from any uses, compiled "clang -O2 -g" with inlining,
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;
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; int ext(void);
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;
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; int
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; foo(int xyzzy)
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; {
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; xyzzy = ext() * xyzzy;
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; xyzzy += 1;
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; ext();
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; return xyzzy;
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; }
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;
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; int
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; bar(int baz, int qux)
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; {
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; int fish;
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; switch (qux) {
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; case 12: fish = 8; break;
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; case 848: fish = 0; break;
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; case 99999: fish = -1; break;
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; default: fish = 12;
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; }
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; qux %= fish;
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; qux += foo(baz);
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; return qux;
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; }
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; CHECK: [[BAZVAR:![0-9]+]] = !DILocalVariable(name: "baz",
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; CHECK: [[XYZVAR:![0-9]+]] = !DILocalVariable(name: "xyzzy",
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; Start of MIR function block,
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; CHECK-LABEL: body
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; Expect DBG_VALUE of physreg,
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; CHECK: DBG_VALUE $edi, $noreg, [[BAZVAR]]
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; Expect DBG_VALUE of virtreg,
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; CHECK: DBG_VALUE [[ARGREG:%[0-9]+]], $noreg, [[BAZVAR]]
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; Label for next block,
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; CHECK-LABEL: bb.1.next
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; Correctly place dbg.value in the 'next' block.
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; CHECK: DBG_VALUE [[ARGREG]], $noreg, [[XYZVAR]]
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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-unknown-linux-gnu"
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declare i32 @ext()
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define dso_local i32 @bar(i32, i32) local_unnamed_addr !dbg !7 {
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%3 = srem i32 %1, %0, !dbg !15
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call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression()), !dbg !16
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br label %next
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next: ; preds = %2
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call void @llvm.dbg.value(metadata i32 %0, metadata !17, metadata !DIExpression()), !dbg !22
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%4 = tail call i32 @ext(), !dbg !24
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%5 = mul nsw i32 %3, %4, !dbg !25
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%6 = add i32 %5, %0, !dbg !25
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ret i32 %6, !dbg !25
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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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: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: ".")
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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 8.0.0"}
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!7 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 19, type: !8, scopeLine: 20, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "baz", arg: 1, scope: !7, file: !1, line: 19, type: !10)
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!15 = !DILocation(line: 35, column: 7, scope: !7)
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!16 = !DILocation(line: 19, column: 9, scope: !7)
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!17 = !DILocalVariable(name: "xyzzy", arg: 1, scope: !18, file: !1, line: 10, type: !10)
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!18 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !19, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !21)
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!19 = !DISubroutineType(types: !20)
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!20 = !{!10, !10}
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!21 = !{!17}
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!22 = !DILocation(line: 10, column: 9, scope: !18, inlinedAt: !23)
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!23 = distinct !DILocation(line: 36, column: 10, scope: !7)
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!24 = !DILocation(line: 12, column: 11, scope: !18, inlinedAt: !23)
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!25 = !DILocation(line: 37, column: 3, scope: !7)
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