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150 lines
6.9 KiB
LLVM
150 lines
6.9 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; Reduced manually from C source:
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; unsigned __attribute__((noinline, optnone)) useslot(unsigned v) { return v; }
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; void __attribute__((noinline)) f(unsigned cell_offset, unsigned *page_start_) {
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; unsigned cell = page_start_[0];
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; while (cell) {
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; unsigned bit_offset = cell_offset ? __builtin_ctz(cell) : 32;
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; unsigned bit_mask = 1U << bit_offset;
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; unsigned slot = (cell_offset + bit_offset) << /*log2(sizeof(void*))*/ 3;
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; cell ^= bit_mask + page_start_[slot];
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; }
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; }
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; int main() {
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; static unsigned pages[32] = {1, 2, 3, 4, 5, 6, 7};
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; f(3, &pages[0]);
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; }
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; We had a bug where the DBG_VALUE instruction for bit_offset would be emitted
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; at the end of the basic block, long after its actual program point. What's
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; interesting in this example is that the !range metadata produces an AssertSext
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; DAG node that gets replaced during ISel. This leads to an unordered SDDbgValue
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; vector, which has to be sorted by IR order before it is processed in parallel
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; with the Orders insertion point vector.
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; CHECK-LABEL: f: # @f
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; CHECK: .LBB0_1: # %while.body
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; CHECK: movl $32, %ecx
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; CHECK: testl {{.*}}
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; CHECK: jne .LBB0_3
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; CHECK: # %bb.2: # %if.then
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; CHECK: callq if_then
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; CHECK: movl %eax, %ecx
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; CHECK: .LBB0_3: # %if.end
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; Check that this DEBUG_VALUE comes before the left shift.
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; CHECK: #DEBUG_VALUE: bit_offset <- %ecx
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; CHECK: .cv_loc 0 1 8 28 # t.c:8:28
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; CHECK: movl $1, %[[reg:[^ ]*]]
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; CHECK: shll %cl, %[[reg]]
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.0.24215"
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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 i32 @if_then()
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; Function Attrs: noinline nounwind readonly uwtable
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define void @f(i32 %cell_offset, i32* nocapture %page_start_) local_unnamed_addr #0 !dbg !31 {
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entry:
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%0 = load i32, i32* %page_start_, align 4, !dbg !45
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%tobool14 = icmp eq i32 %0, 0, !dbg !47
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br i1 %tobool14, label %while.end, label %while.body, !dbg !47
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while.body: ; preds = %while.body.lr.ph, %while.body
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%cell.015 = phi i32 [ %0, %entry ], [ %xor, %if.end ]
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%tobool1 = icmp eq i32 %cell_offset, 0
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br i1 %tobool1, label %if.then, label %if.end
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if.then:
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%1 = call i32 @if_then(), !dbg !48, !range !49
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br label %if.end
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if.end:
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%cond = phi i32 [ %1, %if.then ], [ 32, %while.body ]
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tail call void @llvm.dbg.value(metadata i32 %cond, metadata !39, metadata !DIExpression()), !dbg !51
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%shl = shl i32 1, %cond, !dbg !52
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%add = add i32 %cond, %cell_offset, !dbg !54
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%shl2 = shl i32 %add, 3, !dbg !55
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%idxprom = zext i32 %shl2 to i64, !dbg !57
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%arrayidx3 = getelementptr inbounds i32, i32* %page_start_, i64 %idxprom, !dbg !57
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%2 = load i32, i32* %arrayidx3, align 4, !dbg !57
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%add4 = add i32 %2, %shl, !dbg !58
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%xor = xor i32 %add4, %cell.015, !dbg !59
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tail call void @llvm.dbg.value(metadata i32 %xor, metadata !38, metadata !DIExpression()), !dbg !46
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%tobool = icmp eq i32 %xor, 0, !dbg !47
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br i1 %tobool, label %while.end, label %while.body, !dbg !47, !llvm.loop !60
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while.end: ; preds = %while.body, %entry
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ret void, !dbg !62
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}
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; Function Attrs: nounwind readnone speculatable
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declare i32 @llvm.cttz.i32(i32, i1) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { noinline nounwind readonly 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 = !{!14, !15, !16, !17}
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!llvm.ident = !{!18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "f80d0003faf76554dfdec6c95da285cc")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
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!5 = distinct !DIGlobalVariable(name: "pages", scope: !6, file: !1, line: 18, type: !10, isLocal: true, isDefinition: true)
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!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !7, isLocal: false, isDefinition: true, scopeLine: 17, isOptimized: true, unit: !0, variables: !2)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 1024, elements: !12)
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!11 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!12 = !{!13}
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!13 = !DISubrange(count: 32)
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!14 = !{i32 2, !"CodeView", i32 1}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 2}
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!17 = !{i32 7, !"PIC Level", i32 2}
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!18 = !{!"clang version 6.0.0 "}
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!31 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !32, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !35)
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!32 = !DISubroutineType(types: !33)
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!33 = !{null, !11, !34}
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!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
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!35 = !{!36, !37, !38, !39, !41, !42}
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!36 = !DILocalVariable(name: "page_start_", arg: 2, scope: !31, file: !1, line: 4, type: !34)
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!37 = !DILocalVariable(name: "cell_offset", arg: 1, scope: !31, file: !1, line: 4, type: !11)
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!38 = !DILocalVariable(name: "cell", scope: !31, file: !1, line: 5, type: !11)
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!39 = !DILocalVariable(name: "bit_offset", scope: !40, file: !1, line: 7, type: !11)
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!40 = distinct !DILexicalBlock(scope: !31, file: !1, line: 6, column: 16)
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!41 = !DILocalVariable(name: "bit_mask", scope: !40, file: !1, line: 8, type: !11)
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!42 = !DILocalVariable(name: "slot", scope: !40, file: !1, line: 9, type: !11)
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!43 = !DILocation(line: 4, column: 66, scope: !31)
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!44 = !DILocation(line: 4, column: 43, scope: !31)
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!45 = !DILocation(line: 5, column: 19, scope: !31)
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!46 = !DILocation(line: 5, column: 12, scope: !31)
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!47 = !DILocation(line: 6, column: 3, scope: !31)
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!48 = !DILocation(line: 7, column: 41, scope: !40)
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!49 = !{i32 0, i32 33}
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!50 = !DILocation(line: 7, column: 27, scope: !40)
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!51 = !DILocation(line: 7, column: 14, scope: !40)
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!52 = !DILocation(line: 8, column: 28, scope: !40)
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!53 = !DILocation(line: 8, column: 14, scope: !40)
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!54 = !DILocation(line: 9, column: 34, scope: !40)
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!55 = !DILocation(line: 9, column: 48, scope: !40)
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!56 = !DILocation(line: 9, column: 14, scope: !40)
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!57 = !DILocation(line: 13, column: 24, scope: !40)
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!58 = !DILocation(line: 13, column: 22, scope: !40)
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!59 = !DILocation(line: 13, column: 10, scope: !40)
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!60 = distinct !{!60, !47, !61}
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!61 = !DILocation(line: 14, column: 3, scope: !31)
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!62 = !DILocation(line: 15, column: 1, scope: !31)
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