From d642dc89e098b572d1b7419fc98c36f324d8407e Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Fri, 7 Nov 2014 16:52:56 +0100
Subject: Implement support for double word atomics using libatomic_ops
---
.../internal/libatomic_ops/ethr_dw_atomic.h | 567 +++++++++++++++++++++
erts/include/internal/libatomic_ops/ethread.h | 1 +
2 files changed, 568 insertions(+)
create mode 100644 erts/include/internal/libatomic_ops/ethr_dw_atomic.h
(limited to 'erts')
diff --git a/erts/include/internal/libatomic_ops/ethr_dw_atomic.h b/erts/include/internal/libatomic_ops/ethr_dw_atomic.h
new file mode 100644
index 0000000000..4dd9f41e96
--- /dev/null
+++ b/erts/include/internal/libatomic_ops/ethr_dw_atomic.h
@@ -0,0 +1,567 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2014. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * Description: Native double word atomics using libatomic_ops
+ * Author: Rickard Green
+ */
+
+#ifndef ETHR_LIBATOMIC_OPS_DW_ATOMIC_H__
+#define ETHR_LIBATOMIC_OPS_DW_ATOMIC_H__
+
+#if defined(AO_HAVE_double_t) \
+ && (defined(AO_HAVE_double_load_acquire) \
+ || defined(AO_HAVE_double_load)) \
+ && (defined(AO_HAVE_compare_double_and_swap_double) \
+ || defined(AO_HAVE_compare_double_and_swap_double_full) \
+ || defined(AO_HAVE_compare_double_and_swap_double_acquire) \
+ || defined(AO_HAVE_compare_double_and_swap_double_release) \
+ || defined(AO_HAVE_double_compare_and_swap) \
+ || defined(AO_HAVE_double_compare_and_swap_full) \
+ || defined(AO_HAVE_double_compare_and_swap_acquire) \
+ || defined(AO_HAVE_double_compare_and_swap_release))
+
+#if ETHR_SIZEOF_PTR == 4
+# define ETHR_NATIVE_SU_DW_SINT_T ethr_sint64_t
+#elif ETHR_SIZEOF_PTR == 8 && defined(ETHR_HAVE_INT128_T)
+# define ETHR_NATIVE_SU_DW_SINT_T ethr_sint128_t
+#endif
+
+typedef union {
+ volatile AO_double_t dw_mem;
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+ ETHR_NATIVE_SU_DW_SINT_T su_dw_sint;
+#endif
+} ethr_native_dw_atomic_t;
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_NATIVE_SU_DW_ATOMIC
+#else
+# define ETHR_HAVE_NATIVE_DW_ATOMIC
+#endif
+
+#define ETHR_NATIVE_DW_ATOMIC_IMPL ETHR_NATIVE_IMPL__
+
+#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
+
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_NDWA_FUNC__(Func) ethr_native_su_dw_atomic_ ## Func
+# define ETHR_NDWA_RET_3_TYPE__ ETHR_NATIVE_SU_DW_SINT_T
+# define ETHR_NDWA_RET_2_TYPE__ ETHR_NATIVE_SU_DW_SINT_T
+# define ETHR_NDWA_VAL_ARG_TYPE__ ETHR_NATIVE_SU_DW_SINT_T
+# define ETHR_NDWA_DECL_ARG__(Arg)
+# if defined(AO_HAVE_DOUBLE_PTR_STORAGE)
+# define ETHR_NDWA_VAL2AOVAL__(AOV, V) \
+ ((AOV).AO_whole = (double_ptr_storage) (V))
+# define ETHR_NDWA_AOVAL2VAL__(AOV, V) \
+ ((V) = (ETHR_NATIVE_SU_DW_SINT_T) (AOV).AO_whole)
+# define ETHR_NDWA_RETURN_VAL_3__(SUCCESS, AOVAL, VAL) \
+ do { \
+ return (ETHR_NATIVE_SU_DW_SINT_T) (AOVAL).AO_whole; \
+ } while (0)
+# define ETHR_NDWA_RETURN_VAL_2__(AOVAL, VAL) \
+ do { \
+ return (ETHR_NATIVE_SU_DW_SINT_T) (AOVAL).AO_whole; \
+ } while (0)
+# define ETHR_NDWA_AOVAL_EQ__(AOV1, AOV2) \
+ ((AOV1).AO_whole == (AOV2).AO_whole)
+# else
+typedef union {
+ ethr_sint_t sint[2];
+ ETHR_NATIVE_SU_DW_SINT_T dw_sint;
+} ethr_dw_splitter_t;
+# define ETHR_NDWA_VAL2AOVAL__(AOV, V) \
+ do { \
+ ethr_dw_splitter_t tmp__; \
+ tmp__.dw_sint = (V); \
+ (AOV).AO_val1 = (AO_t) tmp__.sint[0]; \
+ (AOV).AO_val2 = (AO_t) tmp__.sint[1]; \
+ } while (0)
+# define ETHR_NDWA_AOVAL2VAL__(AOV, V) \
+ do { \
+ ethr_dw_splitter_t tmp__; \
+ tmp__.sint[0] = (ethr_sint_t) (AOV).AO_val1; \
+ tmp__.sint[1] = (ethr_sint_t) (AOV).AO_val2; \
+ (V) = tmp__.dw_sint; \
+ } while (0)
+# define ETHR_NDWA_RETURN_VAL_3__(SUCCESS, AOVAL, VAL) \
+ do { \
+ ethr_dw_splitter_t tmp__; \
+ tmp__.sint[0] = (ethr_sint_t) (AOVAL).AO_val1; \
+ tmp__.sint[1] = (ethr_sint_t) (AOVAL).AO_val2; \
+ return tmp__.dw_sint; \
+ } while (0)
+# define ETHR_NDWA_AOVAL_EQ__(AOV1, AOV2) \
+ ((AOV1).AO_val1 == (AOV2).AO_val1 \
+ && (AOV1).AO_val2 == (AOV2).AO_val2)
+# endif
+#else
+# define ETHR_NDWA_FUNC__(Func) ethr_native_dw_atomic_ ## Func
+# define ETHR_NDWA_RET_3_TYPE__ int
+# define ETHR_NDWA_RET_2_TYPE__ void
+# define ETHR_NDWA_VAL_ARG_TYPE__ ethr_sint_t *
+# define ETHR_NDWA_DECL_ARG__(Arg) , ETHR_NDWA_VAL_ARG_TYPE__ Arg
+# define ETHR_NDWA_VAL2AOVAL__(AOV, V) \
+ do { \
+ (AOV).AO_val1 = (AO_t) (V)[0]; \
+ (AOV).AO_val2 = (AO_t) (V)[1]; \
+ } while (0)
+# define ETHR_NDWA_AOVAL2VAL__(AOV, V) \
+ do { \
+ ethr_dw_splitter_t tmp__; \
+ (V)[0] = (ethr_sint_t) (AOV).AO_val1; \
+ (V)[1] = (ethr_sint_t) (AOV).AO_val2; \
+ } while (0)
+# define ETHR_NDWA_RETURN_VAL_3__(SUCCESS, AOVAL, VAL) \
+ do { \
+ (VAL)[0] = (ethr_sint_t) (AOVAL).AO_val1; \
+ (VAL)[1] = (ethr_sint_t) (AOVAL).AO_val2; \
+ return (SUCCESS); \
+ } while (0)
+# define ETHR_NDWA_RETURN_VAL_2__(AOVAL, VAL) \
+ do { \
+ (VAL)[0] = (ethr_sint_t) (AOVAL).AO_val1; \
+ (VAL)[1] = (ethr_sint_t) (AOVAL).AO_val2; \
+ return; \
+ } while (0)
+# if defined(AO_HAVE_DOUBLE_PTR_STORAGE)
+# define ETHR_NDWA_AOVAL_EQ__(AOV1, AOV2) \
+ ((AOV1).AO_whole == (AOV2).AO_whole)
+# else
+# define ETHR_NDWA_AOVAL_EQ__(AOV1, AOV2) \
+ ((AOV1).AO_val1 == (AOV2).AO_val1 \
+ && (AOV1).AO_val2 == (AOV2).AO_val2)
+# endif
+#endif
+
+#define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_ADDR
+static ETHR_INLINE ethr_sint_t *
+ethr_native_dw_atomic_addr(ethr_native_dw_atomic_t *var)
+{
+ return (ethr_sint_t *) &var->dw_mem;
+}
+
+#ifdef AO_HAVE_double_load
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_READ
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_READ
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_2_TYPE__
+ETHR_NDWA_FUNC__(read)(ethr_native_dw_atomic_t *var
+ ETHR_NDWA_DECL_ARG__(val))
+{
+ AO_double_t act = AO_double_load(&var->dw_mem);
+ ETHR_NDWA_RETURN_VAL_2__(act, val);
+}
+
+#endif
+
+#ifdef AO_HAVE_double_load_read
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_READ_RB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_READ_RB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_2_TYPE__
+ETHR_NDWA_FUNC__(read_rb)(ethr_native_dw_atomic_t *var
+ ETHR_NDWA_DECL_ARG__(val))
+{
+ AO_double_t act = AO_double_load_read(&var->dw_mem);
+ ETHR_NDWA_RETURN_VAL_2__(act, val);
+}
+
+#endif
+
+#ifdef AO_HAVE_double_load_acquire
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_READ_ACQB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_READ_ACQB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_2_TYPE__
+ETHR_NDWA_FUNC__(read_acqb)(ethr_native_dw_atomic_t *var
+ ETHR_NDWA_DECL_ARG__(val))
+{
+ AO_double_t act = AO_double_load_acquire(&var->dw_mem);
+ ETHR_NDWA_RETURN_VAL_2__(act, val);
+}
+
+#endif
+
+#ifdef AO_HAVE_double_store
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_SET
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_SET
+#endif
+
+static ETHR_INLINE void
+ETHR_NDWA_FUNC__(set)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ val)
+{
+ AO_double_t new;
+ ETHR_NDWA_VAL2AOVAL__(new, val);
+ AO_double_store(&var->dw_mem, new);
+}
+
+#endif
+
+#ifdef AO_HAVE_double_store_write
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_SET_WB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_SET_WB
+#endif
+
+static ETHR_INLINE void
+ETHR_NDWA_FUNC__(set_wb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ val)
+{
+ AO_double_t new;
+ ETHR_NDWA_VAL2AOVAL__(new, val);
+ AO_double_store_write(&var->dw_mem, new);
+}
+
+#endif
+
+#ifdef AO_HAVE_double_store_release
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_SET_RELB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_SET_RELB
+#endif
+
+static ETHR_INLINE void
+ETHR_NDWA_FUNC__(set_relb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ val)
+{
+ AO_double_t new;
+ ETHR_NDWA_VAL2AOVAL__(new, val);
+ AO_double_store_release(&var->dw_mem, new);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap_full) || defined(AO_HAVE_compare_double_and_swap_double_full)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_MB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_MB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg_mb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap_full)
+ xchgd = AO_double_compare_and_swap_full(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double_full)
+ xchgd = AO_compare_double_and_swap_double_full(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+#ifdef AO_HAVE_double_load_acquire
+ ao_act = AO_double_load_acquire(&var->dw_mem);
+#else
+ ao_act = AO_double_load(&var->dw_mem);
+#endif
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+#ifndef AO_HAVE_double_load_acquire
+ AO_nop_full();
+#endif
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap) || defined(AO_HAVE_compare_double_and_swap_double)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap)
+ xchgd = AO_double_compare_and_swap(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double)
+ xchgd = AO_compare_double_and_swap_double(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+#ifdef AO_HAVE_double_load
+ ao_act = AO_double_load(&var->dw_mem);
+#else
+ ao_act = AO_double_load_acquire(&var->dw_mem);
+#endif
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap_read) || defined(AO_HAVE_compare_double_and_swap_double_read)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_RB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_RB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg_rb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap_read)
+ xchgd = AO_double_compare_and_swap_read(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double_read)
+ xchgd = AO_compare_double_and_swap_double_read(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+#if defined(AO_HAVE_double_load_read)
+ ao_act = AO_double_load_read(&var->dw_mem);
+#elif defined(AO_HAVE_double_load)
+ ao_act = AO_double_load(&var->dw_mem);
+#else
+ ao_act = AO_double_load_acquire(&var->dw_mem);
+#endif
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+#ifndef AO_HAVE_double_load_read
+#ifdef AO_HAVE_nop_read
+ AO_nop_read();
+#else
+ AO_nop_full();
+#endif
+#endif
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap_acquire) || defined(AO_HAVE_compare_double_and_swap_double_acquire)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_ACQB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_ACQB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg_acqb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap_acquire)
+ xchgd = AO_double_compare_and_swap_acquire(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double_acquire)
+ xchgd = AO_compare_double_and_swap_double_acquire(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+#ifdef AO_HAVE_double_load_acquire
+ ao_act = AO_double_load_acquire(&var->dw_mem);
+#else
+ ao_act = AO_double_load(&var->dw_mem);
+#endif
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+#ifndef AO_HAVE_double_load_acquire
+ AO_nop_full();
+#endif
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap_write) || defined(AO_HAVE_compare_double_and_swap_double_write)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_WB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_WB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg_wb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap_write)
+ xchgd = AO_double_compare_and_swap_write(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double_write)
+ xchgd = AO_compare_double_and_swap_double_write(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+#ifdef AO_HAVE_double_load
+ ao_act = AO_double_load(&var->dw_mem);
+#else
+ ao_act = AO_double_load_acquire(&var->dw_mem);
+#endif
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#if defined(AO_HAVE_double_compare_and_swap_release) || defined(AO_HAVE_compare_double_and_swap_double_release)
+
+#if defined(ETHR_NATIVE_SU_DW_SINT_T)
+# define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_RELB
+#else
+# define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_RELB
+#endif
+
+static ETHR_INLINE ETHR_NDWA_RET_3_TYPE__
+ETHR_NDWA_FUNC__(cmpxchg_relb)(ethr_native_dw_atomic_t *var,
+ ETHR_NDWA_VAL_ARG_TYPE__ new,
+ ETHR_NDWA_VAL_ARG_TYPE__ exp)
+{
+ AO_double_t ao_act, ao_new, ao_exp;
+
+ ETHR_NDWA_VAL2AOVAL__(ao_exp, exp);
+ ETHR_NDWA_VAL2AOVAL__(ao_new, new);
+
+ do {
+ int xchgd;
+#if defined(AO_HAVE_double_compare_and_swap_release)
+ xchgd = AO_double_compare_and_swap_release(&var->dw_mem, ao_exp, ao_new);
+#elif defined(AO_HAVE_compare_double_and_swap_double_release)
+ xchgd = AO_compare_double_and_swap_double_release(&var->dw_mem,
+ ao_exp.AO_val1,
+ ao_exp.AO_val2,
+ ao_new.AO_val1,
+ ao_new.AO_val2);
+#endif
+
+ if (xchgd)
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_exp, exp);
+
+ ao_act = AO_double_load(&var->dw_mem);
+
+ } while (ETHR_NDWA_AOVAL_EQ__(ao_exp, ao_act));
+
+ ETHR_NDWA_RETURN_VAL_3__(1, ao_act, exp);
+}
+
+#endif
+
+#endif /* defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__) */
+
+#endif /* Have AO double functionality ... */
+
+#endif /* ETHR_LIBATOMIC_OPS_DW_ATOMIC_H__ */
+
diff --git a/erts/include/internal/libatomic_ops/ethread.h b/erts/include/internal/libatomic_ops/ethread.h
index 7375b73793..d65ee19b04 100644
--- a/erts/include/internal/libatomic_ops/ethread.h
+++ b/erts/include/internal/libatomic_ops/ethread.h
@@ -38,6 +38,7 @@
#include "atomic_ops.h"
#include "ethr_membar.h"
#include "ethr_atomic.h"
+#include "ethr_dw_atomic.h"
#endif
--
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