PPC: Use optimal seq for atomic load/store

src/compiler/ppc/code-generator-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 746 matching lines @@
     if (mode == kMode_MRI) {                                  \
       __ asm_instr(value, operand);                           \
     } else {                                                  \
       CleanUInt32(offset);                                    \
       __ asm_instrx(value, operand);                          \
     }                                                         \
     __ bind(&done);                                           \
     DCHECK_EQ(LeaveRC, i.OutputRCBit());                      \
   } while (0)
 
-#define ASSEMBLE_ATOMIC_LOAD_INTEGER(asm_instr, asm_instrx)   \
-  do {                                                        \
-    Label done;                                               \
-    Register result = i.OutputRegister();                     \
-    AddressingMode mode = kMode_None;                         \
-    MemOperand operand = i.MemoryOperand(&mode);              \
-    __ sync();                                                \
-    if (mode == kMode_MRI) {                                  \
-    __ asm_instr(result, operand);                            \
-    } else {                                                  \
-    __ asm_instrx(result, operand);                           \
-    }                                                         \
-    __ bind(&done);                                           \
-    __ cmp(result, result);                                   \
-    __ bne(&done);                                            \
-    __ isync();                                               \
+#define ASSEMBLE_ATOMIC_LOAD_INTEGER(asm_instr, asm_instrx) \
+  do {                                                      \
+    Label done;                                             \
+    Register result = i.OutputRegister();                   \
+    AddressingMode mode = kMode_None;                       \
+    MemOperand operand = i.MemoryOperand(&mode);            \
+    if (mode == kMode_MRI) {                                \
+      __ asm_instr(result, operand);                        \
+    } else {                                                \
+      __ asm_instrx(result, operand);                       \
+    }                                                       \
+    __ lwsync();                                            \
   } while (0)
-#define ASSEMBLE_ATOMIC_STORE_INTEGER(asm_instr, asm_instrx)  \
-  do {                                                        \
-    size_t index = 0;                                         \
-    AddressingMode mode = kMode_None;                         \
-    MemOperand operand = i.MemoryOperand(&mode, &index);      \
-    Register value = i.InputRegister(index);                  \
-    __ sync();                                                \
-    if (mode == kMode_MRI) {                                  \
-      __ asm_instr(value, operand);                           \
-    } else {                                                  \
-      __ asm_instrx(value, operand);                          \
-    }                                                         \
-    DCHECK_EQ(LeaveRC, i.OutputRCBit());                      \
+#define ASSEMBLE_ATOMIC_STORE_INTEGER(asm_instr, asm_instrx) \
+  do {                                                       \
+    size_t index = 0;                                        \
+    AddressingMode mode = kMode_None;                        \
+    MemOperand operand = i.MemoryOperand(&mode, &index);     \
+    Register value = i.InputRegister(index);                 \
+    __ lwsync();                                             \
+    if (mode == kMode_MRI) {                                 \
+      __ asm_instr(value, operand);                          \
+    } else {                                                 \
+      __ asm_instrx(value, operand);                         \
+    }                                                        \
+    __ sync();                                               \
+    DCHECK_EQ(LeaveRC, i.OutputRCBit());                     \
   } while (0)
 
 void CodeGenerator::AssembleDeconstructFrame() {
   __ LeaveFrame(StackFrame::MANUAL);
 }
 
 void CodeGenerator::AssemblePrepareTailCall() {
   if (frame_access_state()->has_frame()) {
     __ RestoreFrameStateForTailCall();
   }
@@ skipping 1673 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8