PPC: smi test optimization

src/ppc/macro-assembler-ppc.h

 // 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.
 
 #ifndef V8_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 1045 matching lines @@
   // Bit numbering is such that the least significant bit is bit 0
   // (for consistency between 32/64-bit).
 
   // Extract consecutive bits (defined by rangeStart - rangeEnd) from src
   // and place them into the least significant bits of dst.
   inline void ExtractBitRange(Register dst, Register src, int rangeStart,
                               int rangeEnd, RCBit rc = LeaveRC) {
     DCHECK(rangeStart >= rangeEnd && rangeStart < kBitsPerPointer);
     int rotate = (rangeEnd == 0) ? 0 : kBitsPerPointer - rangeEnd;
     int width = rangeStart - rangeEnd + 1;
+    if (rc == SetRC && rangeEnd == 0 && width <= 16) {
+      andi(dst, src, Operand((1 << width) - 1));
+    } else {
 #if V8_TARGET_ARCH_PPC64
-    rldicl(dst, src, rotate, kBitsPerPointer - width, rc);
+      rldicl(dst, src, rotate, kBitsPerPointer - width, rc);
 #else
-    rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer - 1, rc);
+      rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer - 1,
+             rc);
 #endif
+    }
   }
 
   inline void ExtractBit(Register dst, Register src, uint32_t bitNumber,
                          RCBit rc = LeaveRC) {
     ExtractBitRange(dst, src, bitNumber, bitNumber, rc);
   }
 
   // Extract consecutive bits (defined by mask) from src and place them
   // into the least significant bits of dst.
   inline void ExtractBitMask(Register dst, Register src, uintptr_t mask,
@@ skipping 483 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_