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6ff20f205b
If an otherwise weak var is actually defined in this unit, it can't be undefined at runtime so we can use normal global variable sequences (ADRP/ADD) to access it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176259 91177308-0d34-0410-b5e6-96231b3b80d8
35 lines
879 B
LLVM
35 lines
879 B
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -o - < %s | FileCheck %s
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declare extern_weak i32 @var()
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define i32()* @foo() {
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; The usual ADRP/ADD pair can't be used for a weak reference because it must
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; evaluate to 0 if the symbol is undefined. We use a litpool entry.
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ret i32()* @var
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; CHECK: .LCPI0_0:
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; CHECK-NEXT: .xword var
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; CHECK: ldr x0, [{{x[0-9]+}}, #:lo12:.LCPI0_0]
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}
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@arr_var = extern_weak global [10 x i32]
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define i32* @bar() {
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%addr = getelementptr [10 x i32]* @arr_var, i32 0, i32 5
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; CHECK: .LCPI1_0:
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; CHECK-NEXT: .xword arr_var
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; CHECK: ldr [[BASE:x[0-9]+]], [{{x[0-9]+}}, #:lo12:.LCPI1_0]
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; CHECK: add x0, [[BASE]], #20
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ret i32* %addr
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}
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@defined_weak_var = internal unnamed_addr global i32 0
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define i32* @wibble() {
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ret i32* @defined_weak_var
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; CHECK: adrp [[BASE:x[0-9]+]], defined_weak_var
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; CHECK: add x0, [[BASE]], #:lo12:defined_weak_var
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} |