From e85de03b8114c0cd99557fbfb4ae37dfc974c843 Mon Sep 17 00:00:00 2001
From: Martin Ertsaas <mertsas@cisco.com>
Date: Thu, 22 Jan 2015 08:58:20 +0100
Subject: [PATCH] Add support for the TILE-Gx processor family.

---
 src/Makefile.am                               |  1 +
 src/google/protobuf/stubs/atomicops.h         |  2 +
 .../stubs/atomicops_internals_tile_gcc.h      | 77 +++++++++++++++++++
 src/google/protobuf/stubs/platform_macros.h   |  3 +
 4 files changed, 83 insertions(+)
 create mode 100644 src/google/protobuf/stubs/atomicops_internals_tile_gcc.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 3a469fd7de..60cd26d160 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -42,6 +42,7 @@ nobase_include_HEADERS =                                        \
   google/protobuf/stubs/atomicops.h                             \
   google/protobuf/stubs/atomicops_internals_aix.h               \
   google/protobuf/stubs/atomicops_internals_arm64_gcc.h         \
+  google/protobuf/stubs/atomicops_internals_tile_gcc.h          \
   google/protobuf/stubs/atomicops_internals_arm_gcc.h           \
   google/protobuf/stubs/atomicops_internals_arm_qnx.h           \
   google/protobuf/stubs/atomicops_internals_atomicword_compat.h \
diff --git a/src/google/protobuf/stubs/atomicops.h b/src/google/protobuf/stubs/atomicops.h
index bbe2d845e2..36c1ec939b 100644
--- a/src/google/protobuf/stubs/atomicops.h
+++ b/src/google/protobuf/stubs/atomicops.h
@@ -207,6 +207,8 @@ GOOGLE_PROTOBUF_ATOMICOPS_ERROR
 #include <google/protobuf/stubs/atomicops_internals_arm64_gcc.h>
 #elif defined(GOOGLE_PROTOBUF_ARCH_ARM_QNX)
 #include <google/protobuf/stubs/atomicops_internals_arm_qnx.h>
+#elif defined(GOOGLE_PROTOBUF_ARCH_TILE)
+#include <google/protobuf/stubs/atomicops_internals_tile_gcc.h>
 #elif defined(GOOGLE_PROTOBUF_ARCH_MIPS) || defined(GOOGLE_PROTOBUF_ARCH_MIPS64)
 #include <google/protobuf/stubs/atomicops_internals_mips_gcc.h>
 #elif defined(__native_client__)
diff --git a/src/google/protobuf/stubs/atomicops_internals_tile_gcc.h b/src/google/protobuf/stubs/atomicops_internals_tile_gcc.h
new file mode 100644
index 0000000000..6e5418a4f7
--- /dev/null
+++ b/src/google/protobuf/stubs/atomicops_internals_tile_gcc.h
@@ -0,0 +1,77 @@
+#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
+#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+    asm volatile ("st4 %0, %1"
+                  : "=r" (*ptr)
+                  : "m" (value));
+}
+
+inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
+    Atomic32 dest;
+    asm volatile ("ld4s %0, %1"
+                  : "=r" (dest)
+                  : "m" (*ptr));
+    return dest;
+}
+
+inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
+    asm volatile ("st %0, %1"
+                  : "=r" (*ptr)
+                  : "m" (value));
+}
+
+inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
+    Atomic64 dest;
+    asm volatile ("ld %0, %1"
+                  : "=r" (dest)
+                  : "m" (*ptr));
+    return dest;
+}
+
+inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
+    return NoBarrier_Load(ptr);
+}
+
+inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
+    NoBarrier_Store(ptr, value);
+}
+
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
+                                       Atomic64 old_value,
+                                       Atomic64 new_value) {
+    Atomic64 tmp;
+    asm volatile ("mtspr CMPEXCH_VALUE, %3\n\t"
+                  "cmpexch %0, %1, %2"
+                  : "=r" (tmp), "=m" (*ptr)
+                  : "r" (new_value), "r" (old_value));
+    return tmp;
+}
+
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
+                                         Atomic64 new_value) {
+    Atomic64 old_value;
+    asm volatile ("exch %0, %1, %2"
+                  : "=r" (old_value), "=m" (*ptr)
+                  : "r" (new_value));
+    return old_value;
+}
+
+inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
+                                          Atomic64 value) {
+    Atomic64 dest;
+    asm volatile ("fetchadd %0, %1, %2"
+                  : "=r" (dest), "=m" (*ptr)
+                  : "r" (value));
+    return *ptr;
+}
+
+}
+}
+}
+
+#endif
diff --git a/src/google/protobuf/stubs/platform_macros.h b/src/google/protobuf/stubs/platform_macros.h
index 1ff09b83c9..0ab993f4eb 100644
--- a/src/google/protobuf/stubs/platform_macros.h
+++ b/src/google/protobuf/stubs/platform_macros.h
@@ -52,6 +52,9 @@
 #elif defined(__ARMEL__)
 #define GOOGLE_PROTOBUF_ARCH_ARM 1
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
+#elif defined(__tile__)
+#define GOOGLE_PROTOBUF_ARCH_TILE 1
+#define GOOGLE_PROTOBUF_ARCH_64_BIT 1
 #elif defined(__aarch64__)
 #define GOOGLE_PROTOBUF_ARCH_AARCH64 1
 #define GOOGLE_PROTOBUF_ARCH_64_BIT 1