ARM64: initial backend import

This adds a second implementation of the AArch64 architecture to LLVM,
accessible in parallel via the "arm64" triple. The plan over the
coming weeks & months is to merge the two into a single backend,
during which time thorough code review should naturally occur.

Everything will be easier with the target in-tree though, hence this
commit.

llvm-svn: 205090

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM64/stack-no-frame.ll b/llvm/test/CodeGen/ARM64/stack-no-frame.ll
new file mode 100644
index 00000000000..b5970c00ff9
--- /dev/null
+++ b/llvm/test/CodeGen/ARM64/stack-no-frame.ll
@@ -0,0 +1,20 @@
+; RUN: llc -mtriple=arm64-apple-ios7.0 -o - %s | FileCheck %s
+
+@global = global [20 x i64] zeroinitializer, align 8
+
+; The following function has enough locals to need some restoring, but not a
+; frame record. In an intermediate frame refactoring, prologue and epilogue were
+; inconsistent about how much to move SP.
+define void @test_stack_no_frame() {
+; CHECK: test_stack_no_frame
+; CHECK: sub sp, sp, #[[STACKSIZE:[0-9]+]]
+  %local = alloca [20 x i64]
+  %val = load volatile [20 x i64]* @global, align 8
+  store volatile [20 x i64] %val, [20 x i64]* %local, align 8
+
+  %val2 = load volatile [20 x i64]* %local, align 8
+  store volatile [20 x i64] %val2, [20 x i64]* @global, align 8
+
+; CHECK: add sp, sp, #[[STACKSIZE]]
+  ret void
+}