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3a5b1043d0
This moves most of GlobalOpt's constructor optimization
code out of GlobalOpt into Transforms/Utils/CDtorUtils.{h,cpp}. The
public interface is a single function OptimizeGlobalCtorsList() that
takes a predicate returning which constructors to remove.
GlobalOpt calls this with a function that statically evaluates all
constructors, just like it did before. This part of the change is
behavior-preserving.
Also add a call to this from GlobalDCE with a filter that removes global
constructors that contain a "ret" instruction and nothing else – this
fixes PR19590.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207856 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.6 KiB
LLVM
46 lines
1.6 KiB
LLVM
; RUN: opt -S -O2 < %s | FileCheck %s
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; This test checks that -O2 is able to delete constructors that become empty
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; only after some optimization passes have run, even if the pass structure
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; changes.
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; CHECK-NOT: @_GLOBAL__I_a
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%class.Foo = type { i32 }
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@foo = global %class.Foo zeroinitializer, align 4
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@_ZN3Bar18LINKER_INITIALIZEDE = external constant i32
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
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define internal void @__cxx_global_var_init() section "__TEXT,__StaticInit,regular,pure_instructions" {
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%1 = load i32* @_ZN3Bar18LINKER_INITIALIZEDE, align 4
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call void @_ZN3FooC1E17LinkerInitialized(%class.Foo* @foo, i32 %1)
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ret void
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}
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; Function Attrs: ssp uwtable
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define linkonce_odr void @_ZN3FooC1E17LinkerInitialized(%class.Foo* %this, i32) unnamed_addr #0 align 2 {
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%2 = alloca %class.Foo*, align 8
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%3 = alloca i32, align 4
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store %class.Foo* %this, %class.Foo** %2, align 8
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store i32 %0, i32* %3, align 4
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%4 = load %class.Foo** %2
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%5 = load i32* %3, align 4
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call void @_ZN3FooC2E17LinkerInitialized(%class.Foo* %4, i32 %5)
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ret void
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}
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; Function Attrs: nounwind ssp uwtable
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define linkonce_odr void @_ZN3FooC2E17LinkerInitialized(%class.Foo* %this, i32) unnamed_addr #1 align 2 {
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%2 = alloca %class.Foo*, align 8
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%3 = alloca i32, align 4
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store %class.Foo* %this, %class.Foo** %2, align 8
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store i32 %0, i32* %3, align 4
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%4 = load %class.Foo** %2
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ret void
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}
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define internal void @_GLOBAL__I_a() section "__TEXT,__StaticInit,regular,pure_instructions" {
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call void @__cxx_global_var_init()
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ret void
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}
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