5d17ae2d5d
For fully promoted variables dbg.assigns and dbg.values convey the same information and can be used interchangeably. This patch converts dbg.assigns to dbg.values for variables promoted by mem2reg. This reduces resource usage by reducing the amount of unnecessary function local metadata. The compile time tracker reports that CTMark projects build with LTO-O3-g with 0.4% fewer instructions retired and peak memory usage is reduced by 2.2%. Reviewed By: jryans Differential Revision: https://reviews.llvm.org/D145511
72 lines
3.9 KiB
LLVM
72 lines
3.9 KiB
LLVM
; RUN: opt -passes=sroa -S -o - %s \
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; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
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;
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;; Based on llvm/test/DebugInfo/ARM/sroa-complex.ll
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;; generated from:
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;; $ cat test.c
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;; void f(_Complex double c) { c = 0; }
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;; $ clang test.c -g -O2 -c -Xclang -disable-llvm-passes -S \
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;; -emit-llvm -o - --target="thumbv7-apple-unknown"
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;;
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;; Commented out some parts of the function that are not relevant to the test.
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;;
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;; Check that a split store gets dbg.assigns fragments. Ensure that only the
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;; value-expression gets fragment info; that the address-expression remains
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;; untouched.
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;; dbg.assigns for the split (then promoted) stores.
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; CHECK: %c.coerce.fca.0.extract = extractvalue [2 x i64] %c.coerce, 0
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; CHECK: %c.coerce.fca.1.extract = extractvalue [2 x i64] %c.coerce, 1
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; CHECK: call void @llvm.dbg.value(metadata i64 %c.coerce.fca.0.extract,{{.+}}, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64))
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; CHECK: call void @llvm.dbg.value(metadata i64 %c.coerce.fca.1.extract,{{.+}}, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64))
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7-apple-unknown"
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define dso_local arm_aapcscc void @f([2 x i64] %c.coerce) #0 !dbg !8 {
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entry:
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%c = alloca { double, double }, align 8, !DIAssignID !14
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call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(), metadata !14, metadata ptr %c, metadata !DIExpression()), !dbg !15
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%0 = bitcast ptr %c to [2 x i64]*
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store [2 x i64] %c.coerce, [2 x i64]* %0, align 8, !DIAssignID !16
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call void @llvm.dbg.assign(metadata [2 x i64] %c.coerce, metadata !13, metadata !DIExpression(), metadata !16, metadata [2 x i64]* %0, metadata !DIExpression()), !dbg !15
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; --- The rest of this function isn't useful for the test ---
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;%c.realp = getelementptr inbounds { double, double }, ptr %c, i32 0, i32 0, !dbg !17
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;%c.imagp = getelementptr inbounds { double, double }, ptr %c, i32 0, i32 1, !dbg !17
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;store double 0.000000e+00, ptr %c.realp, align 8, !dbg !17, !DIAssignID !18
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;call void @llvm.dbg.assign(metadata double 0.000000e+00, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !18, metadata ptr %c.realp, metadata !DIExpression()), !dbg !15
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;store double 0.000000e+00, ptr %c.imagp, align 8, !dbg !17, !DIAssignID !19
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;call void @llvm.dbg.assign(metadata double 0.000000e+00, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !19, metadata ptr %c.imagp, metadata !DIExpression()), !dbg !15
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ret void, !dbg !20
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6, !1000}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/")
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!2 = !{}
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!3 = !{i32 7, !"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 = !{i32 1, !"min_enum_size", i32 4}
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!7 = !{!"clang version 12.0.0"}
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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !9, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(name: "complex", size: 128, encoding: DW_ATE_complex_float)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "c", arg: 1, scope: !8, file: !1, line: 2, type: !11)
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!14 = distinct !DIAssignID()
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!15 = !DILocation(line: 0, scope: !8)
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!16 = distinct !DIAssignID()
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!17 = !DILocation(line: 2, column: 31, scope: !8)
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!18 = distinct !DIAssignID()
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!19 = distinct !DIAssignID()
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!20 = !DILocation(line: 2, column: 36, scope: !8)
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!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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