PPC: Enable unaligned access and clean up the use of UNALIGNED_ACCESSES

src/ppc/macro-assembler-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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 3311 matching lines @@
 
   ShiftRightImm(scratch, length, Operand(kPointerSizeLog2));
   cmpi(scratch, Operand::Zero());
   beq(&byte_loop);
 
   mtctr(scratch);
   bind(&word_loop);
   LoadP(scratch, MemOperand(src));
   addi(src, src, Operand(kPointerSize));
   subi(length, length, Operand(kPointerSize));
-  if (CpuFeatures::IsSupported(UNALIGNED_ACCESSES)) {
-    // currently false for PPC - but possible future opt
-    StoreP(scratch, MemOperand(dst));
-    addi(dst, dst, Operand(kPointerSize));
-  } else {
-#if V8_TARGET_LITTLE_ENDIAN
-    stb(scratch, MemOperand(dst, 0));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 1));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 2));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 3));
-#if V8_TARGET_ARCH_PPC64
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 4));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 5));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 6));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 7));
-#endif
-#else
-#if V8_TARGET_ARCH_PPC64
-    stb(scratch, MemOperand(dst, 7));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 6));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 5));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 4));
-    ShiftRightImm(scratch, scratch, Operand(8));
-#endif
-    stb(scratch, MemOperand(dst, 3));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 2));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 1));
-    ShiftRightImm(scratch, scratch, Operand(8));
-    stb(scratch, MemOperand(dst, 0));
-#endif
-    addi(dst, dst, Operand(kPointerSize));
-  }
+
+  StoreP(scratch, MemOperand(dst));
+  addi(dst, dst, Operand(kPointerSize));
   bdnz(&word_loop);
 
   // Copy the last bytes if any left.
   cmpi(length, Operand::Zero());
   beq(&done);
 
   bind(&byte_loop);
   mtctr(length);
   bind(&byte_loop_1);
   lbz(scratch, MemOperand(src));
@@ skipping 1532 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC