5a4ec5c42b
Only when load-hoisted we can be sure the base pointer is invariant during the SCoP's execution. Most of the time it would be added to the required hoists for the alias checks anyway, except with -polly-ignore-aliasing, -polly-use-runtime-alias-checks=0 or if AliasAnalysis is already sure it doesn't alias with anything (for instance if there is no other pointer to alias with). Two more parts in Polly assume that this load-hoisting took place: - setNewAccessRelation() which contains an assert which tests this. - BlockGenerator which would use to the base ptr from the original code if not load-hoisted (if the access expression is regenerated) Differential Revision: https://reviews.llvm.org/D30694 llvm-svn: 297195
103 lines
5.2 KiB
LLVM
103 lines
5.2 KiB
LLVM
; RUN: opt %loadPolly -pass-remarks-missed="polly-detect" -polly-detect-track-failures -polly-detect -analyze < %s 2>&1| FileCheck %s
|
|
|
|
; struct b {
|
|
; double **b;
|
|
; };
|
|
;
|
|
; void a(struct b *A) {
|
|
; for (int i=0; i<32; i++)
|
|
; A[i].b[i] = 0;
|
|
; }
|
|
|
|
; The loads are currently just adds %7 to the list of required invariant loads
|
|
; and only -polly-scops checks whether it is actionally possible the be load
|
|
; hoisted. The SCoP is still rejected by -polly-detect because it may alias
|
|
; with %A and is not considered to be eligble for runtime alias checking.
|
|
|
|
; CHECK: remark: ReportVariantBasePtr01.c:6:8: The following errors keep this region from being a Scop.
|
|
; CHECK: remark: ReportVariantBasePtr01.c:7:5: Accesses to the arrays "A", " <unknown> " may access the same memory.
|
|
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
%struct.b = type { double** }
|
|
|
|
define void @a(%struct.b* nocapture readonly %A) #0 !dbg !4 {
|
|
entry:
|
|
br label %entry.split
|
|
|
|
entry.split: ; preds = %entry
|
|
tail call void @llvm.dbg.value(metadata %struct.b* %A, i64 0, metadata !16, metadata !DIExpression()), !dbg !23
|
|
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !25
|
|
br label %for.body, !dbg !27
|
|
|
|
for.body: ; preds = %for.body, %entry.split
|
|
%indvar4 = phi i64 [ %indvar.next, %for.body ], [ 0, %entry.split ]
|
|
%b = getelementptr inbounds %struct.b, %struct.b* %A, i64 %indvar4, i32 0, !dbg !26
|
|
%0 = mul i64 %indvar4, 4, !dbg !26
|
|
%1 = add i64 %0, 3, !dbg !26
|
|
%2 = add i64 %0, 2, !dbg !26
|
|
%3 = add i64 %0, 1, !dbg !26
|
|
%4 = load double**, double*** %b, align 8, !dbg !26, !tbaa !28
|
|
%arrayidx = getelementptr double*, double** %4, i64 %0, !dbg !26
|
|
store double* null, double** %arrayidx, align 8, !dbg !26, !tbaa !33
|
|
%5 = load double**, double*** %b, align 8, !dbg !26, !tbaa !28
|
|
%arrayidx.1 = getelementptr double*, double** %5, i64 %3, !dbg !26
|
|
store double* null, double** %arrayidx.1, align 8, !dbg !26, !tbaa !33
|
|
%6 = load double**, double*** %b, align 8, !dbg !26, !tbaa !28
|
|
%arrayidx.2 = getelementptr double*, double** %6, i64 %2, !dbg !26
|
|
store double* null, double** %arrayidx.2, align 8, !dbg !26, !tbaa !33
|
|
%7 = load double**, double*** %b, align 8, !dbg !26, !tbaa !28
|
|
%arrayidx.3 = getelementptr double*, double** %7, i64 %1, !dbg !26
|
|
store double* null, double** %arrayidx.3, align 8, !dbg !26, !tbaa !33
|
|
%indvar.next = add i64 %indvar4, 1, !dbg !27
|
|
%exitcond = icmp eq i64 %indvar.next, 8, !dbg !27
|
|
br i1 %exitcond, label %for.end, label %for.body, !dbg !27
|
|
|
|
for.end: ; preds = %for.body
|
|
ret void, !dbg !34
|
|
}
|
|
|
|
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
|
|
|
|
attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
|
attributes #1 = { nounwind readnone }
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!20, !21}
|
|
!llvm.ident = !{!22}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
|
|
!1 = !DIFile(filename: "ReportVariantBasePtr01.c", directory: "test/ScopDetectionDiagnostics")
|
|
!2 = !{}
|
|
!4 = distinct !DISubprogram(name: "a", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 5, file: !1, scope: !5, type: !6, variables: !15)
|
|
!5 = !DIFile(filename: "ReportVariantBasePtr01.c", directory: "test/ScopDetectionDiagnostics")
|
|
!6 = !DISubroutineType(types: !7)
|
|
!7 = !{null, !8}
|
|
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
|
|
!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "b", line: 1, size: 64, align: 64, file: !1, elements: !10)
|
|
!10 = !{!11}
|
|
!11 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 2, size: 64, align: 64, file: !1, scope: !9, baseType: !12)
|
|
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13)
|
|
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !14)
|
|
!14 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
|
|
!15 = !{!16, !17}
|
|
!16 = !DILocalVariable(name: "A", line: 5, arg: 1, scope: !4, file: !5, type: !8)
|
|
!17 = !DILocalVariable(name: "i", line: 6, scope: !18, file: !5, type: !19)
|
|
!18 = distinct !DILexicalBlock(line: 6, column: 3, file: !1, scope: !4)
|
|
!19 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
|
!20 = !{i32 2, !"Dwarf Version", i32 4}
|
|
!21 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!22 = !{!"clang version 3.5.0 "}
|
|
!23 = !DILocation(line: 5, column: 18, scope: !4)
|
|
!24 = !{i32 0}
|
|
!25 = !DILocation(line: 6, column: 12, scope: !18)
|
|
!26 = !DILocation(line: 7, column: 5, scope: !18)
|
|
!27 = !DILocation(line: 6, column: 8, scope: !18)
|
|
!28 = !{!29, !30, i64 0}
|
|
!29 = !{!"b", !30, i64 0}
|
|
!30 = !{!"any pointer", !31, i64 0}
|
|
!31 = !{!"omnipotent char", !32, i64 0}
|
|
!32 = !{!"Simple C/C++ TBAA"}
|
|
!33 = !{!30, !30, i64 0}
|
|
!34 = !DILocation(line: 8, column: 1, scope: !4)
|