143 lines
6.8 KiB
LLVM
143 lines
6.8 KiB
LLVM
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; RUN: opt < %s -debug-only=loop-vectorize -loop-vectorize -mtriple=x86_64-unknown-linux -S 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; Test that the register usage estimation is not affected by the presence of
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; debug intrinsics.
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;
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; In the test below the values %0 and %r.08 are ended in the add instruction
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; preceding the call to the intrinsic, and will be recorded against the index
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; of the call instruction. This means the debug intrinsic must be considered
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; when erasing instructions from the list of open-intervals.
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;
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; Tests generated from following source (with and without -g):
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; unsigned test(unsigned *a, unsigned n) {
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; unsigned i, r = 0;
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; for(i = 0; i < n; i++)
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; r += a[i];
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; return r;
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; }
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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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; CHECK: LV: Checking a loop in "test_g"
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; CHECK: LV(REG): Found max usage: 2 item
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::ScalarRC, 2 registers
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::VectorRC, 2 registers
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; CHECK-NEXT: LV(REG): Found invariant usage: 1 item
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::VectorRC, 2 registers
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define i32 @test_g(i32* nocapture readonly %a, i32 %n) local_unnamed_addr !dbg !6 {
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entry:
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tail call void @llvm.dbg.value(metadata i32* %a, i64 0, metadata !12, metadata !16), !dbg !17
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tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !13, metadata !16), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !16), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !14, metadata !16), !dbg !20
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !16), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !14, metadata !16), !dbg !20
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%cmp6 = icmp eq i32 %n, 0, !dbg !21
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br i1 %cmp6, label %for.end, label %for.body.preheader, !dbg !25
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64, !dbg !21
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br label %for.body, !dbg !27
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%r.08 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv, !dbg !27
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%0 = load i32, i32* %arrayidx, align 4, !dbg !27, !tbaa !28
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%add = add i32 %0, %r.08, !dbg !32
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tail call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !15, metadata !16), !dbg !19
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !33
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tail call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !15, metadata !16), !dbg !19
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count, !dbg !21
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br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !25, !llvm.loop !35
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for.end.loopexit: ; preds = %for.body
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br label %for.end, !dbg !38
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for.end: ; preds = %for.end.loopexit, %entry
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%r.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
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ret i32 %r.0.lcssa, !dbg !38
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}
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; CHECK: LV: Checking a loop in "test"
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; CHECK: LV(REG): Found max usage: 2 item
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::ScalarRC, 2 registers
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::VectorRC, 2 registers
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; CHECK-NEXT: LV(REG): Found invariant usage: 1 item
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; CHECK-NEXT: LV(REG): RegisterClass: Generic::VectorRC, 2 registers
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define i32 @test(i32* nocapture readonly %a, i32 %n) local_unnamed_addr {
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entry:
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%cmp6 = icmp eq i32 %n, 0
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br i1 %cmp6, label %for.end, label %for.body.preheader
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%r.08 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4, !tbaa !28
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%add = add i32 %0, %r.08
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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%r.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
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ret i32 %r.0.lcssa
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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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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!6 = distinct !DISubprogram(name: "test_g", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !10, !9}
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!9 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!11 = !{!12, !13, !14, !15}
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!12 = !DILocalVariable(name: "a", arg: 1, scope: !6, file: !1, line: 1, type: !10)
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!13 = !DILocalVariable(name: "n", arg: 2, scope: !6, file: !1, line: 1, type: !9)
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!14 = !DILocalVariable(name: "i", scope: !6, file: !1, line: 2, type: !9)
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!15 = !DILocalVariable(name: "r", scope: !6, file: !1, line: 2, type: !9)
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!16 = !DIExpression()
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!17 = !DILocation(line: 1, column: 27, scope: !6)
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!18 = !DILocation(line: 1, column: 39, scope: !6)
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!19 = !DILocation(line: 2, column: 15, scope: !6)
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!20 = !DILocation(line: 2, column: 12, scope: !6)
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!21 = !DILocation(line: 3, column: 16, scope: !22)
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!22 = !DILexicalBlockFile(scope: !23, file: !1, discriminator: 1)
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!23 = distinct !DILexicalBlock(scope: !24, file: !1, line: 3, column: 3)
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!24 = distinct !DILexicalBlock(scope: !6, file: !1, line: 3, column: 3)
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!25 = !DILocation(line: 3, column: 3, scope: !26)
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!26 = !DILexicalBlockFile(scope: !24, file: !1, discriminator: 1)
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!27 = !DILocation(line: 4, column: 10, scope: !23)
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!28 = !{!29, !29, i64 0}
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!29 = !{!"int", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 4, column: 7, scope: !23)
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!33 = !DILocation(line: 3, column: 22, scope: !34)
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!34 = !DILexicalBlockFile(scope: !23, file: !1, discriminator: 2)
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!35 = distinct !{!35, !36, !37}
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!36 = !DILocation(line: 3, column: 3, scope: !24)
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!37 = !DILocation(line: 4, column: 13, scope: !24)
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!38 = !DILocation(line: 5, column: 3, scope: !6)
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