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e57faad0f4
Summary: Add an additional bit to ModRefInfo, ModRefInfo::Must, to be cleared for known must aliases. Shift existing Mod/Ref/ModRef values to include an additional most significant bit. Update wrappers that modify ModRefInfo values to reflect the change. Notes: * ModRefInfo::Must is almost entirely cleared in the AAResults methods, the remaining changes are trying to preserve it. * Only some small changes to make custom AA passes set ModRefInfo::Must (BasicAA). * GlobalsModRef already declares a bit, who's meaning overlaps with the most significant bit in ModRefInfo (MayReadAnyGlobal). No changes to shift the value of MayReadAnyGlobal (see AlignedMap). FunctionInfo.getModRef() ajusts most significant bit so correctness is preserved, but the Must info is lost. * There are cases where the ModRefInfo::Must is not set, e.g. 2 calls that only read will return ModRefInfo::NoModRef, though they may read from exactly the same location. Reviewers: dberlin, hfinkel, george.burgess.iv Subscribers: llvm-commits, sanjoy Differential Revision: https://reviews.llvm.org/D38862 llvm-svn: 321309
43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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declare void @readonly_attr(i8* readonly nocapture)
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declare void @writeonly_attr(i8* writeonly nocapture)
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declare void @readnone_attr(i8* readnone nocapture)
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declare void @readonly_func(i8* nocapture) readonly
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declare void @writeonly_func(i8* nocapture) writeonly
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declare void @readnone_func(i8* nocapture) readnone
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declare void @read_write(i8* writeonly nocapture, i8* readonly nocapture, i8* readnone nocapture)
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declare void @func()
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define void @test(i8* noalias %p) {
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entry:
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call void @readonly_attr(i8* %p)
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call void @readonly_func(i8* %p)
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call void @writeonly_attr(i8* %p)
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call void @writeonly_func(i8* %p)
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call void @readnone_attr(i8* %p)
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call void @readnone_func(i8* %p)
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call void @read_write(i8* %p, i8* %p, i8* %p)
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call void @func() ["deopt" (i8* %p)]
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call void @writeonly_attr(i8* %p) ["deopt" (i8* %p)]
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ret void
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}
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; CHECK: Just Ref (MustAlias): Ptr: i8* %p <-> call void @readonly_attr(i8* %p)
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; CHECK: Just Ref: Ptr: i8* %p <-> call void @readonly_func(i8* %p)
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; CHECK: Just Mod (MustAlias): Ptr: i8* %p <-> call void @writeonly_attr(i8* %p)
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; CHECK: Just Mod: Ptr: i8* %p <-> call void @writeonly_func(i8* %p)
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; CHECK: NoModRef: Ptr: i8* %p <-> call void @readnone_attr(i8* %p)
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; CHECK: NoModRef: Ptr: i8* %p <-> call void @readnone_func(i8* %p)
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; CHECK: Both ModRef: Ptr: i8* %p <-> call void @read_write(i8* %p, i8* %p, i8* %p)
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; CHECK: Just Ref (MustAlias): Ptr: i8* %p <-> call void @func() [ "deopt"(i8* %p) ]
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; CHECK: Both ModRef: Ptr: i8* %p <-> call void @writeonly_attr(i8* %p) [ "deopt"(i8* %p) ]
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