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| author | Tim Northover <Tim.Northover@arm.com> | 2013-02-06 16:43:33 +0000 |
|---|---|---|
| committer | Tim Northover <Tim.Northover@arm.com> | 2013-02-06 16:43:33 +0000 |
| commit | 8a06229c89f848bf742e2b88423d02558b7ca638 (patch) | |
| tree | 199f15ef02b0e4e5077718feae6f418159dd965a /test/CodeGen/AArch64 | |
| parent | 2e402d5b5f2fce8bfe29509cc771b9919946003b (diff) | |
| download | llvm-8a06229c89f848bf742e2b88423d02558b7ca638.tar.gz llvm-8a06229c89f848bf742e2b88423d02558b7ca638.tar.bz2 llvm-8a06229c89f848bf742e2b88423d02558b7ca638.tar.xz | |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174518 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/AArch64')
| -rw-r--r-- | test/CodeGen/AArch64/extern-weak.ll | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/extern-weak.ll b/test/CodeGen/AArch64/extern-weak.ll new file mode 100644 index 0000000000..54baab2200 --- /dev/null +++ b/test/CodeGen/AArch64/extern-weak.ll @@ -0,0 +1,13 @@ +; 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: ldr x0, .LCPI0_0 + +; CHECK: .LCPI0_0: +; CHECK-NEXT: .xword var +} |