c2281f1565
This patch introduces AAPointerInfo which tracks the uses of a pointer and places them in "bins" based on their offset from the base and access size. As with other AAs, any pointer can be tracked but it is up to the user to make sense of the results. The user in this patch is AAValueSimplify and AAPotentialValues which both utilize AAPointerInfo to determine the value of a load. For now, this is restricted to loads of allocas and internal globals. Through the use of AAPointerInfo and the "bins" we can track struct members separately. The users also know that storing only zeros (at unknown indices) will result in loading only 0 (from unknown indices). Other than that, the users are flow and context insensitive (for now). To deal with the "bins" more easily, AAPointerInfo provides a forallInterfearingAccesses that applies a callback on all accesses that might interfere with a given load or store. Differential Revision: https://reviews.llvm.org/D104432
68 lines
3.2 KiB
LLVM
68 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes --check-globals
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; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=4 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
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; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=4 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
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; RUN: opt -attributor-cgscc -enable-new-pm=0 -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
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; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM
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@_ZL6test1g = internal global i32 42, align 4
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;.
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; CHECK: @[[_ZL6TEST1G:[a-zA-Z0-9_$"\\.-]+]] = internal global i32 42, align 4
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;.
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define void @_Z7test1f1v() nounwind {
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; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
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; IS__TUNIT____-LABEL: define {{[^@]+}}@_Z7test1f1v
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; IS__TUNIT____-SAME: () #[[ATTR0:[0-9]+]] {
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; IS__TUNIT____-NEXT: entry:
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; IS__TUNIT____-NEXT: br label [[IF_END:%.*]]
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; IS__TUNIT____: if.then:
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; IS__TUNIT____-NEXT: unreachable
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; IS__TUNIT____: if.end:
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; IS__TUNIT____-NEXT: ret void
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;
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; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
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; IS__CGSCC____-LABEL: define {{[^@]+}}@_Z7test1f1v
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; IS__CGSCC____-SAME: () #[[ATTR0:[0-9]+]] {
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; IS__CGSCC____-NEXT: entry:
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; IS__CGSCC____-NEXT: br label [[IF_END:%.*]]
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; IS__CGSCC____: if.then:
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; IS__CGSCC____-NEXT: unreachable
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; IS__CGSCC____: if.end:
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; IS__CGSCC____-NEXT: ret void
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;
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entry:
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%tmp = load i32, i32* @_ZL6test1g, align 4
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%cmp = icmp eq i32 %tmp, 0
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 0, i32* @_ZL6test1g, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret void
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}
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define i32 @_Z7test1f2v() nounwind {
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; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
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; IS__TUNIT____-LABEL: define {{[^@]+}}@_Z7test1f2v
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; IS__TUNIT____-SAME: () #[[ATTR0]] {
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; IS__TUNIT____-NEXT: entry:
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; IS__TUNIT____-NEXT: ret i32 42
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;
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; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
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; IS__CGSCC____-LABEL: define {{[^@]+}}@_Z7test1f2v
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; IS__CGSCC____-SAME: () #[[ATTR0]] {
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; IS__CGSCC____-NEXT: entry:
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; IS__CGSCC____-NEXT: ret i32 42
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;
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entry:
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%tmp = load i32, i32* @_ZL6test1g, align 4
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ret i32 %tmp
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}
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;.
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; IS__TUNIT____: attributes #[[ATTR0]] = { nofree nosync nounwind readnone willreturn }
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;.
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; IS__CGSCC____: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone willreturn }
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;.
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