1 files changed, 69 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/global-alignment.ll b/test/CodeGen/AArch64/global-alignment.ll
new file mode 100644
index 000000000000..8ed6e551cdeb
--- /dev/null
+++ b/test/CodeGen/AArch64/global-alignment.ll
@@ -0,0 +1,69 @@
+; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s
+
+@var32 = global [3 x i32] zeroinitializer
+@var64 = global [3 x i64] zeroinitializer
+@var32_align64 = global [3 x i32] zeroinitializer, align 8
+
+define i64 @test_align32() {
+; CHECK: test_align32:
+  %addr = bitcast [3 x i32]* @var32 to i64*
+
+  ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to
+  ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load.
+  %val = load i64* %addr
+; CHECK: adrp [[HIBITS:x[0-9]+]], var32
+; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:var32
+; CHECK: ldr x0, [x[[ADDR]]]
+
+  ret i64 %val
+}
+
+define i64 @test_align64() {
+; CHECK: test_align64:
+  %addr = bitcast [3 x i64]* @var64 to i64*
+
+  ; However, var64 *is* properly aligned and emitting an adrp/add/ldr would be
+  ; inefficient.
+  %val = load i64* %addr
+; CHECK: adrp x[[HIBITS:[0-9]+]], var64
+; CHECK-NOT: add x[[HIBITS]]
+; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var64]
+
+  ret i64 %val
+}
+
+define i64 @test_var32_align64() {
+; CHECK: test_var32_align64:
+  %addr = bitcast [3 x i32]* @var32_align64 to i64*
+
+  ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to
+  ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load.
+  %val = load i64* %addr
+; CHECK: adrp x[[HIBITS:[0-9]+]], var32_align64
+; CHECK-NOT: add x[[HIBITS]]
+; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var32_align64]
+
+  ret i64 %val
+}
+
+@yet_another_var = external global {i32, i32}
+
+define i64 @test_yet_another_var() {
+; CHECK: test_yet_another_var:
+
+  ; @yet_another_var has a preferred alignment of 8, but that's not enough if
+  ; we're going to be linking against other things. Its ABI alignment is only 4
+  ; so we can't fold the load.
+  %val = load i64* bitcast({i32, i32}* @yet_another_var to i64*)
+; CHECK: adrp [[HIBITS:x[0-9]+]], yet_another_var
+; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:yet_another_var
+; CHECK: ldr x0, [x[[ADDR]]]
+  ret i64 %val
+}
+
+define i64()* @test_functions() {
+; CHECK: test_functions:
+  ret i64()* @test_yet_another_var
+; CHECK: adrp [[HIBITS:x[0-9]+]], test_yet_another_var
+; CHECK: add x0, [[HIBITS]], #:lo12:test_yet_another_var
+}