Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/CodeGen/AArch64/arm64-extern-weak.ll

@@ -0,0 +1,53 @@
+; RUN: llc -mtriple=arm64-none-linux-gnu -relocation-model=pic -o - < %s | FileCheck %s
+; RUN: llc -mtriple=arm64-none-linux-gnu -relocation-model=static -o - < %s | FileCheck %s
+; RUN: llc -mtriple=arm64-none-linux-gnu -code-model=large -o - < %s | FileCheck --check-prefix=CHECK-LARGE %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 GOT entry for PIC
+; otherwise a litpool entry.
+  ret i32()* @var
+
+; CHECK: adrp x[[VAR:[0-9]+]], :got:var
+; CHECK: ldr x0, [x[[VAR]], :got_lo12:var]
+
+  ; In the large model, the usual relocations are absolute and can
+  ; materialise 0.
+; CHECK-LARGE: movz x0, #:abs_g0_nc:var
+; CHECK-LARGE: movk x0, #:abs_g1_nc:var
+; CHECK-LARGE: movk x0, #:abs_g2_nc:var
+; CHECK-LARGE: movk x0, #:abs_g3:var
+}
+
+
+@arr_var = extern_weak global [10 x i32]
+
+define i32* @bar() {
+  %addr = getelementptr [10 x i32], [10 x i32]* @arr_var, i32 0, i32 5
+; CHECK: adrp x[[ARR_VAR_HI:[0-9]+]], :got:arr_var
+; CHECK: ldr [[ARR_VAR:x[0-9]+]], [x[[ARR_VAR_HI]], :got_lo12:arr_var]
+; CHECK: add x0, [[ARR_VAR]], #20
+  ret i32* %addr
+
+  ; In the large model, the usual relocations are absolute and can
+  ; materialise 0.
+; CHECK-LARGE: movz [[ARR_VAR:x[0-9]+]], #:abs_g0_nc:arr_var
+; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g1_nc:arr_var
+; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g2_nc:arr_var
+; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g3:arr_var
+}
+
+@defined_weak_var = internal unnamed_addr global i32 0
+
+define i32* @wibble() {
+  ret i32* @defined_weak_var
+; CHECK: adrp [[BASE:x[0-9]+]], defined_weak_var
+; CHECK: add x0, [[BASE]], :lo12:defined_weak_var
+
+; CHECK-LARGE: movz x0, #:abs_g0_nc:defined_weak_var
+; CHECK-LARGE: movk x0, #:abs_g1_nc:defined_weak_var
+; CHECK-LARGE: movk x0, #:abs_g2_nc:defined_weak_var
+; CHECK-LARGE: movk x0, #:abs_g3:defined_weak_var
+}