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bd0298b1e1
The code have been developed by Daniel Berlin over the years, and the new implementation goal is that of addressing shortcomings of the current GVN infrastructure, i.e. long compile time for large testcases, lack of phi predication, no load/store value numbering etc... The current code just implements the "core" GVN algorithm, although other pieces (load coercion, phi handling, predicate system) are already implemented in a branch out of tree. Once the core is stable, we'll start adding pieces on top of the base framework. The test currently living in test/Transform/NewGVN are a copy of the ones in GVN, with proper `XFAIL` (missing features in NewGVN). A flag will be added in a future commit to enable NewGVN, so that interested parties can exercise this code easily. Differential Revision: https://reviews.llvm.org/D26224 llvm-svn: 290346
110 lines
3.8 KiB
LLVM
110 lines
3.8 KiB
LLVM
; XFAIL: *
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; RUN: opt < %s -newgvn -o /dev/null -pass-remarks-output=%t -S -pass-remarks=gvn \
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; RUN: 2>&1 | FileCheck %s
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; RUN: cat %t | FileCheck -check-prefix=YAML %s
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; CHECK: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
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; CHECK-NEXT: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
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; CHECK-NEXT: remark: <unknown>:0:0: load of type i32 eliminated{{$}}
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; CHECK-NOT: remark:
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; YAML: --- !Passed
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; YAML-NEXT: Pass: gvn
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; YAML-NEXT: Name: LoadElim
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; YAML-NEXT: Function: arg
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; YAML-NEXT: Args:
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; YAML-NEXT: - String: 'load of type '
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; YAML-NEXT: - Type: i32
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; YAML-NEXT: - String: ' eliminated'
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; YAML-NEXT: - String: ' in favor of '
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; YAML-NEXT: - InfavorOfValue: i
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; YAML-NEXT: ...
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; YAML-NEXT: --- !Passed
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; YAML-NEXT: Pass: gvn
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; YAML-NEXT: Name: LoadElim
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; YAML-NEXT: Function: const
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; YAML-NEXT: Args:
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; YAML-NEXT: - String: 'load of type '
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; YAML-NEXT: - Type: i32
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; YAML-NEXT: - String: ' eliminated'
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; YAML-NEXT: - String: ' in favor of '
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; YAML-NEXT: - InfavorOfValue: '4'
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; YAML-NEXT: ...
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; YAML-NEXT: --- !Passed
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; YAML-NEXT: Pass: gvn
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; YAML-NEXT: Name: LoadElim
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; YAML-NEXT: Function: inst
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; YAML-NEXT: Args:
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; YAML-NEXT: - String: 'load of type '
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; YAML-NEXT: - Type: i32
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; YAML-NEXT: - String: ' eliminated'
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; YAML-NEXT: - String: ' in favor of '
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; YAML-NEXT: - InfavorOfValue: load
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; YAML-NEXT: ...
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; YAML-NEXT: --- !Missed
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; YAML-NEXT: Pass: gvn
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; YAML-NEXT: Name: LoadClobbered
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; YAML-NEXT: DebugLoc: { File: /tmp/s.c, Line: 3, Column: 3 }
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; YAML-NEXT: Function: may_alias
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; YAML-NEXT: Args:
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; YAML-NEXT: - String: 'load of type '
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; YAML-NEXT: - Type: i32
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; YAML-NEXT: - String: ' not eliminated'
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; YAML-NEXT: - String: ' in favor of '
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; YAML-NEXT: - OtherAccess: load
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; YAML-NEXT: DebugLoc: { File: /tmp/s.c, Line: 1, Column: 13 }
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; YAML-NEXT: - String: ' because it is clobbered by '
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; YAML-NEXT: - ClobberedBy: store
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; YAML-NEXT: DebugLoc: { File: /tmp/s.c, Line: 2, Column: 10 }
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; YAML-NEXT: ...
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define i32 @arg(i32* %p, i32 %i) {
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entry:
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store i32 %i, i32* %p
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%load = load i32, i32* %p
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ret i32 %load
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}
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define i32 @const(i32* %p) {
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entry:
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store i32 4, i32* %p
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%load = load i32, i32* %p
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ret i32 %load
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}
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define i32 @inst(i32* %p) {
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entry:
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%load1 = load i32, i32* %p
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%load = load i32, i32* %p
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%add = add i32 %load1, %load
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ret i32 %add
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}
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define i32 @may_alias(i32* %p, i32* %r) !dbg !7 {
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entry:
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%load1 = load i32, i32* %p, !tbaa !13, !dbg !9
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store i32 4, i32* %r, !tbaa !13, !dbg !10
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%load = load i32, i32* %p, !tbaa !13, !dbg !11
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%add = add i32 %load1, %load
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ret i32 %add
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}
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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_C99, file: !1, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!1 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
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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, !"PIC Level", i32 2}
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!6 = !{!"clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)"}
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!7 = distinct !DISubprogram(name: "may_alias", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
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!8 = !DISubroutineType(types: !2)
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!9 = !DILocation(line: 1, column: 13, scope: !7)
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!10 = !DILocation(line: 2, column: 10, scope: !7)
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!11 = !DILocation(line: 3, column: 3, scope: !7)
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!12 = !{ !"tbaa root" }
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!13 = !{ !"int", !12 }
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