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hanchenye-llvm-project/llvm/test/CodeGen/AArch64/extern-weak.ll

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Implement external weak (ELF) symbols on AArch64 Weakly defined symbols should evaluate to 0 if they're undefined at link-time. This is impossible to do with the usual address generation patterns, so we should use a literal pool entry to materlialise the address. llvm-svn: 174518
2013-02-07 00:43:33 +08:00
; RUN: llc -mtriple=aarch64-none-linux-gnu -o - < %s | FileCheck %s
declare extern_weak i32 @var()
define i32()* @foo() {
; The usual ADRP/ADD pair can't be used for a weak reference because it must
; evaluate to 0 if the symbol is undefined. We use a litpool entry.
ret i32()* @var
; CHECK: .LCPI0_0:
; CHECK-NEXT: .xword var
AArch64: remove ConstantIsland pass & put literals in separate section. This implements the review suggestion to simplify the AArch64 backend. If we later discover that we *really* need the extra complexity of the ConstantIslands pass for performance reasons it can be resurrected. llvm-svn: 175258
2013-02-15 17:33:43 +08:00
; CHECK: ldr x0, [{{x[0-9]+}}, #:lo12:.LCPI0_0]
Implement external weak (ELF) symbols on AArch64 Weakly defined symbols should evaluate to 0 if they're undefined at link-time. This is impossible to do with the usual address generation patterns, so we should use a literal pool entry to materlialise the address. llvm-svn: 174518
2013-02-07 00:43:33 +08:00
}