File 0001-Use-__atomic-intrinsics-for-atomicread-write.patch of Package ghc

From 00d1f097680da6ca718600884794128919dbd87d Mon Sep 17 00:00:00 2001
From: Peter Trommler <ptrommler@acm.org>
Date: Thu, 21 Sep 2017 13:42:58 +0200
Subject: [PATCH] Use __atomic* intrinsics for atomicread/write

---
 libraries/ghc-prim/cbits/atomic.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/libraries/ghc-prim/cbits/atomic.c b/libraries/ghc-prim/cbits/atomic.c
index 2ecbf3461a..e679186394 100644
--- a/libraries/ghc-prim/cbits/atomic.c
+++ b/libraries/ghc-prim/cbits/atomic.c
@@ -265,28 +265,28 @@ extern StgWord hs_atomicread8(StgWord x);
 StgWord
 hs_atomicread8(StgWord x)
 {
-  return *(volatile StgWord8 *) x;
+  return __atomic_load_n((StgWord8 *) x, __ATOMIC_SEQ_CST);
 }
 
 extern StgWord hs_atomicread16(StgWord x);
 StgWord
 hs_atomicread16(StgWord x)
 {
-  return *(volatile StgWord16 *) x;
+  return __atomic_load_n((StgWord16 *) x, __ATOMIC_SEQ_CST);
 }
 
 extern StgWord hs_atomicread32(StgWord x);
 StgWord
 hs_atomicread32(StgWord x)
 {
-  return *(volatile StgWord32 *) x;
+  return __atomic_load_n((StgWord32 *) x, __ATOMIC_SEQ_CST);
 }
 
 extern StgWord64 hs_atomicread64(StgWord x);
 StgWord64
 hs_atomicread64(StgWord x)
 {
-  return *(volatile StgWord64 *) x;
+  return __atomic_load_n((StgWord64 *) x, __ATOMIC_SEQ_CST);
 }
 
 // AtomicWriteByteArrayOp_Int
@@ -295,26 +295,26 @@ extern void hs_atomicwrite8(StgWord x, StgWord val);
 void
 hs_atomicwrite8(StgWord x, StgWord val)
 {
-  *(volatile StgWord8 *) x = (StgWord8) val;
+  __atomic_store_n((StgWord8 *) x, (StgWord8) val, __ATOMIC_SEQ_CST);
 }
 
 extern void hs_atomicwrite16(StgWord x, StgWord val);
 void
 hs_atomicwrite16(StgWord x, StgWord val)
 {
-  *(volatile StgWord16 *) x = (StgWord16) val;
+  __atomic_store_n((StgWord16 *) x, (StgWord16) val, __ATOMIC_SEQ_CST);
 }
 
 extern void hs_atomicwrite32(StgWord x, StgWord val);
 void
 hs_atomicwrite32(StgWord x, StgWord val)
 {
-  *(volatile StgWord32 *) x = (StgWord32) val;
+  __atomic_store_n((StgWord32 *) x, (StgWord32) val, __ATOMIC_SEQ_CST);
 }
 
 extern void hs_atomicwrite64(StgWord x, StgWord64 val);
 void
 hs_atomicwrite64(StgWord x, StgWord64 val)
 {
-  *(volatile StgWord64 *) x = (StgWord64) val;
+  __atomic_store_n((StgWord64 *) x, (StgWord64) val, __ATOMIC_SEQ_CST);
 }
-- 
2.12.3