4796b4ae7b
Currently global SRA uses the GEP structure to determine how to split the global. This patch instead analyses the loads and stores that are performed on the global, and collects which types are used at which offset, and then splits the global according to those. This is both more general, and works fine with opaque pointers. This is also closer to how ordinary SROA is performed. Differential Revision: https://reviews.llvm.org/D117223
51 lines
2.2 KiB
LLVM
51 lines
2.2 KiB
LLVM
; RUN: opt < %s -passes=globalopt -S | FileCheck %s
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; rdar://12580965.
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; ObjC++ test case.
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; Make it easier to verify that alignment is correct/optimal:
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; 16-bit pointers with 32-bit ABI alignment and 128-bit preferred alignment
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target datalayout = "p:16:32:128"
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%struct.ButtonInitData = type { i8* }
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@_ZL14buttonInitData = internal global [1 x %struct.ButtonInitData] zeroinitializer, align 4
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@"\01L_OBJC_METH_VAR_NAME_40" = internal global [7 x i8] c"print:\00", section "__TEXT,__objc_methname,cstring_literals", align 1
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@"\01L_OBJC_SELECTOR_REFERENCES_41" = internal externally_initialized global i8* getelementptr inbounds ([7 x i8], [7 x i8]* @"\01L_OBJC_METH_VAR_NAME_40", i32 0, i32 0), section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"
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@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__I_a, i8* null }]
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@llvm.used = appending global [2 x i8*] [i8* getelementptr inbounds ([7 x i8], [7 x i8]* @"\01L_OBJC_METH_VAR_NAME_40", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_41" to i8*)]
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; Choose the preferred alignment.
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; CHECK: @[[_ZL14BUTTONINITDATA_0_0:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr global i8* null, align 16
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;.
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define internal void @__cxx_global_var_init() section "__TEXT,__StaticInit,regular,pure_instructions" {
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%1 = load i8*, i8** @"\01L_OBJC_SELECTOR_REFERENCES_41", !invariant.load !2009
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store i8* %1, i8** getelementptr inbounds ([1 x %struct.ButtonInitData], [1 x %struct.ButtonInitData]* @_ZL14buttonInitData, i32 0, i32 0, i32 0), align 4
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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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declare void @test(i8*)
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; The preferred alignment is available.
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define void @print() {
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; CHECK-LABEL: @print(
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; CHECK-NEXT: [[TMP1:%.*]] = load i8*, i8** @_ZL14buttonInitData.0, align 16
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; CHECK-NEXT: call void @test(i8* [[TMP1]])
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; CHECK-NEXT: ret void
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;
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%1 = load i8*, i8** getelementptr inbounds ([1 x %struct.ButtonInitData], [1 x %struct.ButtonInitData]* @_ZL14buttonInitData, i32 0, i32 0, i32 0), align 4
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call void @test(i8* %1)
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ret void
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}
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!2009 = !{}
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