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src/cpu/aarch64/vm/cas.m4
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@@ -1,19 +1,50 @@
+dnl Copyright (c) 2016, Red Hat Inc. All rights reserved.
+dnl DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+dnl
+dnl This code is free software; you can redistribute it and/or modify it
+dnl under the terms of the GNU General Public License version 2 only, as
+dnl published by the Free Software Foundation.
+dnl
+dnl This code is distributed in the hope that it will be useful, but WITHOUT
+dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+dnl version 2 for more details (a copy is included in the LICENSE file that
+dnl accompanied this code).
+dnl
+dnl You should have received a copy of the GNU General Public License version
+dnl 2 along with this work; if not, write to the Free Software Foundation,
+dnl Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+dnl
+dnl Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+dnl or visit www.oracle.com if you need additional information or have any
+dnl questions.
+dnl
+dnl
+dnl Process this file with m4 cas.m4 to generate the CAE and wCAS
+dnl instructions used in aarch64.ad.
+dnl
+
+// BEGIN This section of the file is automatically generated. Do not edit --------------
+
// Sundry CAS operations. Note that release is always true,
// regardless of the memory ordering of the CAS. This is because we
// need the volatile case to be sequentially consistent but there is
// no trailing StoreLoad barrier emitted by C2. Unfortunately we
// can't check the type of memory ordering here, so we always emit a
// STLXR.
+// This section is generated from aarch64_ad_cas.m4
+
+
define(`CAS_INSN',
`
-instruct compareAndExchange$1$5(iReg$2_R0 res, indirect mem, iReg$2_R2 oldval, iReg$2_R3 newval, rFlagsReg cr) %{
+instruct compareAndExchange$1$5(iReg$2NoSp res, indirect mem, iReg$2 oldval, iReg$2 newval, rFlagsReg cr) %{
match(Set res (CompareAndExchange$1 mem (Binary oldval newval)));
ifelse($5,Acq,' predicate(needs_acquiring_load_exclusive(n));
ins_cost(VOLATILE_REF_COST);`,' ins_cost(2 * VOLATILE_REF_COST);`)
- effect(KILL cr);
+ effect(TEMP_DEF res, KILL cr);
format %{
"cmpxchg $res = $mem, $oldval, $newval\t# ($3, weak) if $mem == $oldval then $mem <-- $newval"
%}
ins_encode %{
__ cmpxchg($mem$$Register, $oldval$$Register, $newval$$Register,
@@ -22,15 +53,15 @@
%}
ins_pipe(pipe_slow);
%}')dnl
define(`CAS_INSN4',
`
-instruct compareAndExchange$1$7(iReg$2_R0 res, indirect mem, iReg$2_R2 oldval, iReg$2_R3 newval, rFlagsReg cr) %{
+instruct compareAndExchange$1$7(iReg$2NoSp res, indirect mem, iReg$2 oldval, iReg$2 newval, rFlagsReg cr) %{
match(Set res (CompareAndExchange$1 mem (Binary oldval newval)));
ifelse($7,Acq,' predicate(needs_acquiring_load_exclusive(n));
ins_cost(VOLATILE_REF_COST);`,' ins_cost(2 * VOLATILE_REF_COST);`)
- effect(KILL cr);
+ effect(TEMP_DEF res, KILL cr);
format %{
"cmpxchg $res = $mem, $oldval, $newval\t# ($3, weak) if $mem == $oldval then $mem <-- $newval"
%}
ins_encode %{
__ $5(rscratch2, $oldval$$Register);
@@ -105,5 +136,7 @@
dnl CAS_INSN3(I,I,int,word,Acq)
dnl CAS_INSN3(L,L,long,xword,Acq)
dnl CAS_INSN3(N,N,narrow oop,word,Acq)
dnl CAS_INSN3(P,P,ptr,xword,Acq)
dnl
+
+// END This section of the file is automatically generated. Do not edit --------------
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