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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205090 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/test/CodeGen/ARM64/fp128-folding.ll b/test/CodeGen/ARM64/fp128-folding.ll
new file mode 100644
index 0000000000..6a7d203f5b
--- /dev/null
+++ b/test/CodeGen/ARM64/fp128-folding.ll
@@ -0,0 +1,17 @@
+; RUN: llc -march=arm64 -verify-machineinstrs < %s | FileCheck %s
+declare void @bar(i8*, i8*, i32*)
+
+; SelectionDAG used to try to fold some fp128 operations using the ppc128 type,
+; which is not supported.
+
+define fp128 @test_folding() {
+; CHECK-LABEL: test_folding:
+  %l = alloca i32
+  store i32 42, i32* %l
+  %val = load i32* %l
+  %fpval = sitofp i32 %val to fp128
+  ; If the value is loaded from a constant pool into an fp128, it's been folded
+  ; successfully.
+; CHECK: ldr {{q[0-9]+}}, [{{x[0-9]+}},
+  ret fp128 %fpval
+}