forked from OSchip/llvm-project
122 lines
4.9 KiB
LLVM
122 lines
4.9 KiB
LLVM
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; RUN: opt < %s -S -simplifycfg | FileCheck %s
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; SimplifyCFG can hoist any common code in the 'then' and 'else' blocks to
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; the 'if' basic block.
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;
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; For the special case, when hoisting the terminator instruction, its debug
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; location keep references to its basic block, causing the debug information
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; to become ambiguous. It causes the debugger to display unreached lines.
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; Change the debug location associated with the hoisted instruction, to
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; the debug location from the insertion point in the 'if' block.
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; The insertion point is the previous non-debug instruction before the
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; terminator in the parent basic block of the hoisted instruction.
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; IR with '-g':
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;
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; [...]
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; %frombool = zext i1 %cmp to i8, !dbg !26
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; call void @llvm.dbg.value(metadata i8 %frombool, metadata !15, metadata !DIExpression()), !dbg !26
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; call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !27
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; br i1 %cmp, label %if.then, label %if.else
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; [...]
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;
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; Insertion point is: %frombool = zext i1 %cmp to i8, !dbg !26
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; IR generated with:
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; clang -S -g -gno-column-info -O2 -emit-llvm pr39187.cpp -o pr39187-g.ll -mllvm -opt-bisect-limit=10
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; // pr39187.cpp
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; int main() {
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; volatile int foo = 0;
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;
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; int beards = 0;
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; bool cond = foo == 4;
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; int bar = 0;
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; if (cond)
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; beards = 8;
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; else
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; beards = 4;
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;
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; volatile bool face = cond;
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;
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; return face ? beards : 0;
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; }
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; CHECK-LABEL: entry
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; CHECK: %foo = alloca i32, align 4
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; CHECK: %face = alloca i8, align 1
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; CHECK: %foo.0..sroa_cast = bitcast i32* %foo to i8*
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; CHECK: store volatile i32 0, i32* %foo, align 4
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; CHECK: %foo.0. = load volatile i32, i32* %foo, align 4, !dbg !16
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; CHECK: %cmp = icmp eq i32 %foo.0., 4, !dbg !16
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; CHECK: %frombool = zext i1 %cmp to i8, !dbg !16
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; CHECK: call void @llvm.dbg.value(metadata i8 %frombool, metadata !13, metadata !DIExpression()), !dbg !16
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; CHECK: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !17
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; CHECK: %. = select i1 %cmp, i32 8, i32 4, !dbg !16
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; ModuleID = 'pr39187.cpp'
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source_filename = "pr39187.cpp"
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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-pc-linux-gnu"
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; Function Attrs: norecurse nounwind uwtable
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define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
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entry:
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%foo = alloca i32, align 4
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%face = alloca i8, align 1
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%foo.0..sroa_cast = bitcast i32* %foo to i8*
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store volatile i32 0, i32* %foo, align 4
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%foo.0. = load volatile i32, i32* %foo, align 4, !dbg !26
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%cmp = icmp eq i32 %foo.0., 4, !dbg !26
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%frombool = zext i1 %cmp to i8, !dbg !26
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call void @llvm.dbg.value(metadata i8 %frombool, metadata !15, metadata !DIExpression()), !dbg !26
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call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !27
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br i1 %cmp, label %if.then, label %if.else
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if.then: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 8, metadata !14, metadata !DIExpression()), !dbg !25
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br label %if.end
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if.else: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 4, metadata !14, metadata !DIExpression()), !dbg !25
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%beards.0 = phi i32 [ 8, %if.then ], [ 4, %if.else ]
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store volatile i8 %frombool, i8* %face, align 1
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%face.0. = load volatile i8, i8* %face, align 1
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%0 = and i8 %face.0., 1
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%tobool3 = icmp eq i8 %0, 0
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%cond4 = select i1 %tobool3, i32 0, i32 %beards.0
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ret i32 %cond4
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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) #2
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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_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 346301)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "pr39187.cpp", 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 (trunk 346301)"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!14, !15, !17}
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!14 = !DILocalVariable(name: "beards", scope: !7, file: !1, line: 4, type: !10)
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!15 = !DILocalVariable(name: "cond", scope: !7, file: !1, line: 5, type: !16)
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!16 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
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!17 = !DILocalVariable(name: "bar", scope: !7, file: !1, line: 6, type: !10)
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!25 = !DILocation(line: 4, scope: !7)
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!26 = !DILocation(line: 5, scope: !7)
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!27 = !DILocation(line: 6, scope: !7)
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