diff --git a/include/ck_pr.h b/include/ck_pr.h
index 66214dc..2832e17 100644
--- a/include/ck_pr.h
+++ b/include/ck_pr.h
@@ -95,6 +95,8 @@ CK_PR_FENCE_EMIT(store_load)
 CK_PR_FENCE_EMIT(load)
 CK_PR_FENCE_EMIT(store)
 CK_PR_FENCE_EMIT(memory)
+CK_PR_FENCE_EMIT(acquire)
+CK_PR_FENCE_EMIT(release)
 #elif defined(CK_MD_PSO)
 /*
  * Anything can be re-ordered with respect to stores.
@@ -110,6 +112,8 @@ CK_PR_FENCE_EMIT(store_load)
 CK_PR_FENCE_NOOP(load)
 CK_PR_FENCE_EMIT(store)
 CK_PR_FENCE_EMIT(memory)
+CK_PR_FENCE_EMIT(acquire)
+CK_PR_FENCE_EMIT(release)
 #elif defined(CK_MD_TSO)
 /*
  * Only loads are re-ordered and only with respect to
@@ -125,6 +129,10 @@ CK_PR_FENCE_EMIT(store_load)
 CK_PR_FENCE_NOOP(load)
 CK_PR_FENCE_NOOP(store)
 CK_PR_FENCE_NOOP(memory)
+CK_PR_FENCE_NOOP(acquire)
+CK_PR_FENCE_NOOP(release)
+#elif
+#error "No memory model has been defined."
 #endif /* CK_MD_TSO */
 
 #undef CK_PR_FENCE_EMIT
diff --git a/include/gcc/arm/ck_pr.h b/include/gcc/arm/ck_pr.h
index a6a9966..2e67b8c 100644
--- a/include/gcc/arm/ck_pr.h
+++ b/include/gcc/arm/ck_pr.h
@@ -92,6 +92,8 @@ CK_PR_FENCE(store_load, _CK_DMB_ST)
 CK_PR_FENCE(load, _CK_DMB)
 CK_PR_FENCE(load_store, _CK_DMB)
 CK_PR_FENCE(memory, _CK_DMB)
+CK_PR_FENCE(acquire, _CK_DMB)
+CK_PR_FENCE(release, _CK_DMB)
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/ppc/ck_pr.h b/include/gcc/ppc/ck_pr.h
index 6a445f1..da42fcf 100644
--- a/include/gcc/ppc/ck_pr.h
+++ b/include/gcc/ppc/ck_pr.h
@@ -77,6 +77,8 @@ CK_PR_FENCE(store_load, "sync")
 CK_PR_FENCE(load, "lwsync")
 CK_PR_FENCE(load_store, "lwsync")
 CK_PR_FENCE(memory, "sync")
+CK_PR_FENCE(acquire, "lwsync")
+CK_PR_FENCE(release, "lwsync")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/ppc64/ck_pr.h b/include/gcc/ppc64/ck_pr.h
index f66bac1..54b7ec2 100644
--- a/include/gcc/ppc64/ck_pr.h
+++ b/include/gcc/ppc64/ck_pr.h
@@ -80,6 +80,8 @@ CK_PR_FENCE(store_load, "sync")
 CK_PR_FENCE(load, "lwsync")
 CK_PR_FENCE(load_store, "lwsync")
 CK_PR_FENCE(memory, "sync")
+CK_PR_FENCE(acquire, "lwsync")
+CK_PR_FENCE(release, "lwsync")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/sparcv9/ck_pr.h b/include/gcc/sparcv9/ck_pr.h
index 68ffd22..253c8ef 100644
--- a/include/gcc/sparcv9/ck_pr.h
+++ b/include/gcc/sparcv9/ck_pr.h
@@ -77,6 +77,8 @@ CK_PR_FENCE(store_load, "membar #StoreLoad")
 CK_PR_FENCE(load, "membar #LoadLoad")
 CK_PR_FENCE(load_store, "membar #LoadStore")
 CK_PR_FENCE(memory, "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
+CK_PR_FENCE(acquire, "membar #LoadLoad | #LoadStore")
+CK_PR_FENCE(release, "membar #LoadStore | #StoreStore")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/x86/ck_pr.h b/include/gcc/x86/ck_pr.h
index b731c4e..1fef566 100644
--- a/include/gcc/x86/ck_pr.h
+++ b/include/gcc/x86/ck_pr.h
@@ -80,6 +80,8 @@ CK_PR_FENCE(load_store, "mfence")
 CK_PR_FENCE(store, "sfence")
 CK_PR_FENCE(store_load, "mfence")
 CK_PR_FENCE(memory, "mfence")
+CK_PR_FENCE(release, "mfence")
+CK_PR_FENCE(acquire, "mfence")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/x86_64/ck_pr.h b/include/gcc/x86_64/ck_pr.h
index a5cddfb..8200af8 100644
--- a/include/gcc/x86_64/ck_pr.h
+++ b/include/gcc/x86_64/ck_pr.h
@@ -86,6 +86,8 @@ CK_PR_FENCE(load_store, "mfence")
 CK_PR_FENCE(store, "sfence")
 CK_PR_FENCE(store_load, "mfence")
 CK_PR_FENCE(memory, "mfence")
+CK_PR_FENCE(release, "mfence")
+CK_PR_FENCE(acquire, "mfence")
 
 #undef CK_PR_FENCE