author | stefank |
Mon, 25 Nov 2019 12:32:40 +0100 | |
changeset 59251 | 4cbfa5077d68 |
parent 59249 | 29b0d0b61615 |
child 59252 | 623722a6aeb9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. |
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* Copyright (c) 2012, 2019 SAP SE. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef OS_CPU_LINUX_PPC_ATOMIC_LINUX_PPC_HPP |
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#define OS_CPU_LINUX_PPC_ATOMIC_LINUX_PPC_HPP |
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#ifndef PPC64 |
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#error "Atomic currently only implemented for PPC64" |
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#endif |
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#include "orderAccess_linux_ppc.hpp" |
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#include "utilities/debug.hpp" |
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// Implementation of class atomic |
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// |
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// machine barrier instructions: |
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// |
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// - sync two-way memory barrier, aka fence |
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// - lwsync orders Store|Store, |
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// Load|Store, |
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// Load|Load, |
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// but not Store|Load |
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// - eieio orders memory accesses for device memory (only) |
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// - isync invalidates speculatively executed instructions |
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// From the POWER ISA 2.06 documentation: |
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// "[...] an isync instruction prevents the execution of |
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// instructions following the isync until instructions |
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// preceding the isync have completed, [...]" |
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// From IBM's AIX assembler reference: |
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// "The isync [...] instructions causes the processor to |
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// refetch any instructions that might have been fetched |
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// prior to the isync instruction. The instruction isync |
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// causes the processor to wait for all previous instructions |
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// to complete. Then any instructions already fetched are |
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// discarded and instruction processing continues in the |
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// environment established by the previous instructions." |
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// |
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// semantic barrier instructions: |
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// (as defined in orderAccess.hpp) |
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// |
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// - release orders Store|Store, (maps to lwsync) |
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// Load|Store |
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// - acquire orders Load|Store, (maps to lwsync) |
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// Load|Load |
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// - fence orders Store|Store, (maps to sync) |
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// Load|Store, |
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// Load|Load, |
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// Store|Load |
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// |
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inline void pre_membar(atomic_memory_order order) { |
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switch (order) { |
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case memory_order_relaxed: |
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case memory_order_acquire: break; |
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case memory_order_release: |
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case memory_order_acq_rel: __asm__ __volatile__ ("lwsync" : : : "memory"); break; |
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default /*conservative*/ : __asm__ __volatile__ ("sync" : : : "memory"); break; |
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} |
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} |
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inline void post_membar(atomic_memory_order order) { |
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switch (order) { |
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case memory_order_relaxed: |
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case memory_order_release: break; |
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case memory_order_acquire: |
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case memory_order_acq_rel: __asm__ __volatile__ ("isync" : : : "memory"); break; |
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default /*conservative*/ : __asm__ __volatile__ ("sync" : : : "memory"); break; |
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} |
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} |
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template<size_t byte_size> |
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struct Atomic::PlatformAdd |
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: Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> > |
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{ |
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template<typename D, typename I> |
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D add_and_fetch(D volatile* dest, I add_value, atomic_memory_order order) const; |
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}; |
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template<> |
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template<typename D, typename I> |
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inline D Atomic::PlatformAdd<4>::add_and_fetch(D volatile* dest, I add_value, |
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atomic_memory_order order) const { |
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STATIC_ASSERT(4 == sizeof(I)); |
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STATIC_ASSERT(4 == sizeof(D)); |
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D result; |
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pre_membar(order); |
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__asm__ __volatile__ ( |
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"1: lwarx %0, 0, %2 \n" |
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" add %0, %0, %1 \n" |
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" stwcx. %0, 0, %2 \n" |
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" bne- 1b \n" |
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: /*%0*/"=&r" (result) |
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: /*%1*/"r" (add_value), /*%2*/"r" (dest) |
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: "cc", "memory" ); |
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post_membar(order); |
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return result; |
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} |
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template<> |
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template<typename D, typename I> |
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inline D Atomic::PlatformAdd<8>::add_and_fetch(D volatile* dest, I add_value, |
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atomic_memory_order order) const { |
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STATIC_ASSERT(8 == sizeof(I)); |
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STATIC_ASSERT(8 == sizeof(D)); |
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D result; |
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pre_membar(order); |
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|
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__asm__ __volatile__ ( |
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"1: ldarx %0, 0, %2 \n" |
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" add %0, %0, %1 \n" |
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" stdcx. %0, 0, %2 \n" |
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" bne- 1b \n" |
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: /*%0*/"=&r" (result) |
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: /*%1*/"r" (add_value), /*%2*/"r" (dest) |
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: "cc", "memory" ); |
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post_membar(order); |
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150 |
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151 |
return result; |
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152 |
} |
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153 |
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154 |
template<> |
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155 |
template<typename T> |
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inline T Atomic::PlatformXchg<4>::operator()(T volatile* dest, |
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T exchange_value, |
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158 |
atomic_memory_order order) const { |
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// Note that xchg doesn't necessarily do an acquire |
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// (see synchronizer.cpp). |
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161 |
|
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T old_value; |
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const uint64_t zero = 0; |
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164 |
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165 |
pre_membar(order); |
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166 |
|
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167 |
__asm__ __volatile__ ( |
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168 |
/* atomic loop */ |
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169 |
"1: \n" |
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" lwarx %[old_value], %[dest], %[zero] \n" |
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" stwcx. %[exchange_value], %[dest], %[zero] \n" |
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" bne- 1b \n" |
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173 |
/* exit */ |
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174 |
"2: \n" |
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175 |
/* out */ |
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: [old_value] "=&r" (old_value), |
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"=m" (*dest) |
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178 |
/* in */ |
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: [dest] "b" (dest), |
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[zero] "r" (zero), |
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181 |
[exchange_value] "r" (exchange_value), |
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182 |
"m" (*dest) |
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183 |
/* clobber */ |
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184 |
: "cc", |
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185 |
"memory" |
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186 |
); |
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187 |
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188 |
post_membar(order); |
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189 |
|
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190 |
return old_value; |
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191 |
} |
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192 |
|
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193 |
template<> |
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194 |
template<typename T> |
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195 |
inline T Atomic::PlatformXchg<8>::operator()(T volatile* dest, |
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196 |
T exchange_value, |
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197 |
atomic_memory_order order) const { |
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198 |
STATIC_ASSERT(8 == sizeof(T)); |
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199 |
// Note that xchg doesn't necessarily do an acquire |
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// (see synchronizer.cpp). |
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201 |
|
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202 |
T old_value; |
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203 |
const uint64_t zero = 0; |
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204 |
|
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205 |
pre_membar(order); |
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206 |
|
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207 |
__asm__ __volatile__ ( |
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208 |
/* atomic loop */ |
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209 |
"1: \n" |
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210 |
" ldarx %[old_value], %[dest], %[zero] \n" |
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211 |
" stdcx. %[exchange_value], %[dest], %[zero] \n" |
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212 |
" bne- 1b \n" |
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213 |
/* exit */ |
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214 |
"2: \n" |
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215 |
/* out */ |
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216 |
: [old_value] "=&r" (old_value), |
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217 |
"=m" (*dest) |
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218 |
/* in */ |
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219 |
: [dest] "b" (dest), |
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220 |
[zero] "r" (zero), |
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221 |
[exchange_value] "r" (exchange_value), |
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222 |
"m" (*dest) |
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223 |
/* clobber */ |
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224 |
: "cc", |
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225 |
"memory" |
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226 |
); |
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227 |
|
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228 |
post_membar(order); |
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229 |
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230 |
return old_value; |
39404 | 231 |
} |
232 |
||
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233 |
template<> |
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234 |
template<typename T> |
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235 |
inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value, |
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236 |
T volatile* dest, |
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237 |
T compare_value, |
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238 |
atomic_memory_order order) const { |
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239 |
STATIC_ASSERT(1 == sizeof(T)); |
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240 |
|
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241 |
// Note that cmpxchg guarantees a two-way memory barrier across |
39404 | 242 |
// the cmpxchg, so it's really a a 'fence_cmpxchg_fence' if not |
243 |
// specified otherwise (see atomic.hpp). |
|
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244 |
|
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245 |
// Using 32 bit internally. |
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246 |
volatile int *dest_base = (volatile int*)((uintptr_t)dest & ~3); |
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247 |
|
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248 |
#ifdef VM_LITTLE_ENDIAN |
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249 |
const unsigned int shift_amount = ((uintptr_t)dest & 3) * 8; |
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250 |
#else |
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251 |
const unsigned int shift_amount = ((~(uintptr_t)dest) & 3) * 8; |
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252 |
#endif |
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253 |
const unsigned int masked_compare_val = ((unsigned int)(unsigned char)compare_value), |
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254 |
masked_exchange_val = ((unsigned int)(unsigned char)exchange_value), |
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255 |
xor_value = (masked_compare_val ^ masked_exchange_val) << shift_amount; |
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256 |
|
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257 |
unsigned int old_value, value32; |
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258 |
|
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259 |
pre_membar(order); |
39404 | 260 |
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261 |
__asm__ __volatile__ ( |
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262 |
/* simple guard */ |
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263 |
" lbz %[old_value], 0(%[dest]) \n" |
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264 |
" cmpw %[masked_compare_val], %[old_value] \n" |
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265 |
" bne- 2f \n" |
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266 |
/* atomic loop */ |
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267 |
"1: \n" |
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268 |
" lwarx %[value32], 0, %[dest_base] \n" |
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269 |
/* extract byte and compare */ |
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270 |
" srd %[old_value], %[value32], %[shift_amount] \n" |
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271 |
" clrldi %[old_value], %[old_value], 56 \n" |
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272 |
" cmpw %[masked_compare_val], %[old_value] \n" |
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273 |
" bne- 2f \n" |
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274 |
/* replace byte and try to store */ |
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275 |
" xor %[value32], %[xor_value], %[value32] \n" |
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276 |
" stwcx. %[value32], 0, %[dest_base] \n" |
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277 |
" bne- 1b \n" |
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278 |
/* exit */ |
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279 |
"2: \n" |
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280 |
/* out */ |
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281 |
: [old_value] "=&r" (old_value), |
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282 |
[value32] "=&r" (value32), |
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283 |
"=m" (*dest), |
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284 |
"=m" (*dest_base) |
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285 |
/* in */ |
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286 |
: [dest] "b" (dest), |
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287 |
[dest_base] "b" (dest_base), |
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|
288 |
[shift_amount] "r" (shift_amount), |
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|
289 |
[masked_compare_val] "r" (masked_compare_val), |
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|
290 |
[xor_value] "r" (xor_value), |
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|
291 |
"m" (*dest), |
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|
292 |
"m" (*dest_base) |
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|
293 |
/* clobber */ |
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|
294 |
: "cc", |
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|
295 |
"memory" |
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|
296 |
); |
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|
297 |
|
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|
298 |
post_membar(order); |
39404 | 299 |
|
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|
300 |
return PrimitiveConversions::cast<T>((unsigned char)old_value); |
35063
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|
301 |
} |
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|
302 |
|
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303 |
template<> |
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|
304 |
template<typename T> |
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|
305 |
inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, |
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|
306 |
T volatile* dest, |
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|
307 |
T compare_value, |
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|
308 |
atomic_memory_order order) const { |
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|
309 |
STATIC_ASSERT(4 == sizeof(T)); |
22824
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|
310 |
|
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|
311 |
// Note that cmpxchg guarantees a two-way memory barrier across |
39404 | 312 |
// the cmpxchg, so it's really a a 'fence_cmpxchg_fence' if not |
313 |
// specified otherwise (see atomic.hpp). |
|
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|
314 |
|
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|
315 |
T old_value; |
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|
316 |
const uint64_t zero = 0; |
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|
317 |
|
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|
318 |
pre_membar(order); |
39404 | 319 |
|
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|
320 |
__asm__ __volatile__ ( |
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|
321 |
/* simple guard */ |
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parents:
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|
322 |
" lwz %[old_value], 0(%[dest]) \n" |
28258dd5cb2e
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parents:
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changeset
|
323 |
" cmpw %[compare_value], %[old_value] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
324 |
" bne- 2f \n" |
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parents:
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|
325 |
/* atomic loop */ |
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parents:
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|
326 |
"1: \n" |
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changeset
|
327 |
" lwarx %[old_value], %[dest], %[zero] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
328 |
" cmpw %[compare_value], %[old_value] \n" |
28258dd5cb2e
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parents:
diff
changeset
|
329 |
" bne- 2f \n" |
28258dd5cb2e
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parents:
diff
changeset
|
330 |
" stwcx. %[exchange_value], %[dest], %[zero] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
331 |
" bne- 1b \n" |
28258dd5cb2e
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parents:
diff
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|
332 |
/* exit */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
333 |
"2: \n" |
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parents:
diff
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|
334 |
/* out */ |
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parents:
diff
changeset
|
335 |
: [old_value] "=&r" (old_value), |
28258dd5cb2e
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parents:
diff
changeset
|
336 |
"=m" (*dest) |
28258dd5cb2e
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parents:
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|
337 |
/* in */ |
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parents:
diff
changeset
|
338 |
: [dest] "b" (dest), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
339 |
[zero] "r" (zero), |
28258dd5cb2e
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parents:
diff
changeset
|
340 |
[compare_value] "r" (compare_value), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
341 |
[exchange_value] "r" (exchange_value), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
342 |
"m" (*dest) |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
343 |
/* clobber */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
344 |
: "cc", |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
345 |
"memory" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
346 |
); |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
347 |
|
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|
348 |
post_membar(order); |
39404 | 349 |
|
46958
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|
350 |
return old_value; |
22824
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goetz
parents:
diff
changeset
|
351 |
} |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
352 |
|
46958
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eosterlund
parents:
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changeset
|
353 |
template<> |
a13bd8c6b7a2
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eosterlund
parents:
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diff
changeset
|
354 |
template<typename T> |
a13bd8c6b7a2
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eosterlund
parents:
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changeset
|
355 |
inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, |
a13bd8c6b7a2
8186166: Generalize Atomic::cmpxchg with templates
eosterlund
parents:
46523
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changeset
|
356 |
T volatile* dest, |
a13bd8c6b7a2
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eosterlund
parents:
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changeset
|
357 |
T compare_value, |
50029
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47634
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changeset
|
358 |
atomic_memory_order order) const { |
46958
a13bd8c6b7a2
8186166: Generalize Atomic::cmpxchg with templates
eosterlund
parents:
46523
diff
changeset
|
359 |
STATIC_ASSERT(8 == sizeof(T)); |
22824
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parents:
diff
changeset
|
360 |
|
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
361 |
// Note that cmpxchg guarantees a two-way memory barrier across |
39404 | 362 |
// the cmpxchg, so it's really a a 'fence_cmpxchg_fence' if not |
363 |
// specified otherwise (see atomic.hpp). |
|
22824
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
364 |
|
46958
a13bd8c6b7a2
8186166: Generalize Atomic::cmpxchg with templates
eosterlund
parents:
46523
diff
changeset
|
365 |
T old_value; |
22824
28258dd5cb2e
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goetz
parents:
diff
changeset
|
366 |
const uint64_t zero = 0; |
28258dd5cb2e
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goetz
parents:
diff
changeset
|
367 |
|
50029
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8202080: Introduce ordering semantics for Atomic::add and other RMW atomics
mdoerr
parents:
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changeset
|
368 |
pre_membar(order); |
39404 | 369 |
|
22824
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
370 |
__asm__ __volatile__ ( |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
371 |
/* simple guard */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
372 |
" ld %[old_value], 0(%[dest]) \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
373 |
" cmpd %[compare_value], %[old_value] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
374 |
" bne- 2f \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
375 |
/* atomic loop */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
376 |
"1: \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
377 |
" ldarx %[old_value], %[dest], %[zero] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
378 |
" cmpd %[compare_value], %[old_value] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
379 |
" bne- 2f \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
380 |
" stdcx. %[exchange_value], %[dest], %[zero] \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
381 |
" bne- 1b \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
382 |
/* exit */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
383 |
"2: \n" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
384 |
/* out */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
385 |
: [old_value] "=&r" (old_value), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
386 |
"=m" (*dest) |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
387 |
/* in */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
388 |
: [dest] "b" (dest), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
389 |
[zero] "r" (zero), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
390 |
[compare_value] "r" (compare_value), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
391 |
[exchange_value] "r" (exchange_value), |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
392 |
"m" (*dest) |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
393 |
/* clobber */ |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
394 |
: "cc", |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
395 |
"memory" |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
396 |
); |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
397 |
|
50029
ea0a16ba6ac0
8202080: Introduce ordering semantics for Atomic::add and other RMW atomics
mdoerr
parents:
47634
diff
changeset
|
398 |
post_membar(order); |
39404 | 399 |
|
46958
a13bd8c6b7a2
8186166: Generalize Atomic::cmpxchg with templates
eosterlund
parents:
46523
diff
changeset
|
400 |
return old_value; |
22824
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
401 |
} |
28258dd5cb2e
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
402 |
|
59247
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
54069
diff
changeset
|
403 |
template<size_t byte_size> |
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
54069
diff
changeset
|
404 |
struct Atomic::PlatformOrderedLoad<byte_size, X_ACQUIRE> |
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
54069
diff
changeset
|
405 |
{ |
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
54069
diff
changeset
|
406 |
template <typename T> |
56bf71d64d51
8234562: Move OrderAccess::release_store*/load_acquire to Atomic
stefank
parents:
54069
diff
changeset
|
407 |
T operator()(const volatile T* p) const { |
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T t = Atomic::load(p); |
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// Use twi-isync for load_acquire (faster than lwsync). |
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__asm__ __volatile__ ("twi 0,%0,0\n isync\n" : : "r" (t) : "memory"); |
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return t; |
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} |
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}; |
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|
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#endif // OS_CPU_LINUX_PPC_ATOMIC_LINUX_PPC_HPP |