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b3b970744d
Imported functions and variable get the visibility from the module supplying the definition. However, non-imported definitions do not get the visibility from (ELF) the most constraining visibility among all modules (Mach-O) the visibility of the prevailing definition. This patch * adds visibility bits to GlobalValueSummary::GVFlags * computes the result visibility and propagates it to all definitions Protected/hidden can imply dso_local which can enable some optimizations (this is stronger than GVFlags::DSOLocal because the implied dso_local can be leveraged for ELF -shared while default visibility dso_local has to be cleared for ELF -shared). Note: we don't have summaries for declarations, so for ELF if a declaration has the most constraining visibility, the result visibility may not be that one. Differential Revision: https://reviews.llvm.org/D92900
27 lines
1.3 KiB
LLVM
27 lines
1.3 KiB
LLVM
; Test that instruction operands from loads are not cached when
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; processing stores. Reference from @foo to @obj should not be
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; readonly or writeonly
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; RUN: opt -module-summary %s -o %t.bc
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; RUN: llvm-dis %t.bc -o - | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.S = type { %struct.Derived* }
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%struct.Derived = type { i32 }
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%struct.Base = type { i32 }
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@obj = dso_local local_unnamed_addr global %struct.S zeroinitializer, align 8
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define dso_local %struct.Base* @foo() local_unnamed_addr {
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entry:
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%0 = load %struct.Base*, %struct.Base** bitcast (%struct.S* @obj to %struct.Base**), align 8
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store %struct.Base* null, %struct.Base** bitcast (%struct.S* @obj to %struct.Base**), align 8
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ret %struct.Base* %0
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}
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; CHECK: ^0 = module:
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; CHECK-NEXT: ^1 = gv: (name: "obj", summaries: (variable: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 0, dsoLocal: 1, canAutoHide: 0), varFlags: (readonly: 1, writeonly: 1, constant: 0)))) ; guid =
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; CHECK-NEXT: ^2 = gv: (name: "foo", summaries: (function: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 0, dsoLocal: 1, canAutoHide: 0), insts: 3, refs: (^1)))) ; guid =
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