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, 63 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM64/tls-execs.ll b/llvm/test/CodeGen/ARM64/tls-execs.ll
new file mode 100644
index 00000000000..f0130d85889
--- /dev/null
+++ b/llvm/test/CodeGen/ARM64/tls-execs.ll
@@ -0,0 +1,63 @@
+; RUN: llc -mtriple=arm64-none-linux-gnu -verify-machineinstrs -show-mc-encoding < %s | FileCheck %s
+; RUN: llc -mtriple=arm64-none-linux-gnu -filetype=obj < %s | llvm-objdump -r - | FileCheck --check-prefix=CHECK-RELOC %s
+
+@initial_exec_var = external thread_local(initialexec) global i32
+
+define i32 @test_initial_exec() {
+; CHECK-LABEL: test_initial_exec:
+  %val = load i32* @initial_exec_var
+
+; CHECK: adrp x[[GOTADDR:[0-9]+]], :gottprel:initial_exec_var
+; CHECK: ldr x[[TP_OFFSET:[0-9]+]], [x[[GOTADDR]], :gottprel_lo12:initial_exec_var]
+; CHECK: mrs x[[TP:[0-9]+]], TPIDR_EL0
+; CHECK: ldr w0, [x[[TP]], x[[TP_OFFSET]]]
+
+; CHECK-RELOC: R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
+; CHECK-RELOC: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
+
+  ret i32 %val
+}
+
+define i32* @test_initial_exec_addr() {
+; CHECK-LABEL: test_initial_exec_addr:
+  ret i32* @initial_exec_var
+
+; CHECK: adrp x[[GOTADDR:[0-9]+]], :gottprel:initial_exec_var
+; CHECK: ldr [[TP_OFFSET:x[0-9]+]], [x[[GOTADDR]], :gottprel_lo12:initial_exec_var]
+; CHECK: mrs [[TP:x[0-9]+]], TPIDR_EL0
+; CHECK: add x0, [[TP]], [[TP_OFFSET]]
+
+; CHECK-RELOC: R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
+; CHECK-RELOC: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
+
+}
+
+@local_exec_var = thread_local(localexec) global i32 0
+
+define i32 @test_local_exec() {
+; CHECK-LABEL: test_local_exec:
+  %val = load i32* @local_exec_var
+
+; CHECK: movz [[TP_OFFSET:x[0-9]+]], #:tprel_g1:local_exec_var // encoding: [0bAAA{{[01]+}},A,0b101AAAAA,0x92]
+; CHECK: movk [[TP_OFFSET]], #:tprel_g0_nc:local_exec_var
+; CHECK: mrs x[[TP:[0-9]+]], TPIDR_EL0
+; CHECK: ldr w0, [x[[TP]], [[TP_OFFSET]]]
+
+; CHECK-RELOC: R_AARCH64_TLSLE_MOVW_TPREL_G1
+; CHECK-RELOC: R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
+
+  ret i32 %val
+}
+
+define i32* @test_local_exec_addr() {
+; CHECK-LABEL: test_local_exec_addr:
+  ret i32* @local_exec_var
+
+; CHECK: movz [[TP_OFFSET:x[0-9]+]], #:tprel_g1:local_exec_var
+; CHECK: movk [[TP_OFFSET]], #:tprel_g0_nc:local_exec_var
+; CHECK: mrs [[TP:x[0-9]+]], TPIDR_EL0
+; CHECK: add x0, [[TP]], [[TP_OFFSET]]
+
+; CHECK-RELOC: R_AARCH64_TLSLE_MOVW_TPREL_G1
+; CHECK-RELOC: R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
+}