[arm] Recognize SXTB, SXTH, UXTB and UXTH.

src/arm/codegen-arm.cc

 // Copyright 2012 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/v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/arm/simulator-arm.h"
 #include "src/codegen.h"
@@ skipping 270 matching lines @@
     Register temp4 = r4;
     Label loop;
     Label not_two;
 
     __ Push(lr, r4);
     __ bic(temp2, chars, Operand(0x3));
     __ add(temp2, dest, Operand(temp2, LSL, 1));
 
     __ bind(&loop);
     __ ldr(temp1, MemOperand(src, 4, PostIndex));
-    __ uxtb16(temp3, Operand(temp1, ROR, 0));
-    __ uxtb16(temp4, Operand(temp1, ROR, 8));
+    __ uxtb16(temp3, temp1);
+    __ uxtb16(temp4, temp1, 8);
     __ pkhbt(temp1, temp3, Operand(temp4, LSL, 16));
     __ str(temp1, MemOperand(dest));
     __ pkhtb(temp1, temp4, Operand(temp3, ASR, 16));
     __ str(temp1, MemOperand(dest, 4));
     __ add(dest, dest, Operand(8));
     __ cmp(dest, temp2);
     __ b(&loop, ne);
 
     __ mov(chars, Operand(chars, LSL, 31), SetCC);  // bit0 => ne, bit1 => cs
     __ b(&not_two, cc);
     __ ldrh(temp1, MemOperand(src, 2, PostIndex));
-    __ uxtb(temp3, Operand(temp1, ROR, 8));
+    __ uxtb(temp3, temp1, 8);
     __ mov(temp3, Operand(temp3, LSL, 16));
-    __ uxtab(temp3, temp3, Operand(temp1, ROR, 0));
+    __ uxtab(temp3, temp3, temp1);
     __ str(temp3, MemOperand(dest, 4, PostIndex));
     __ bind(&not_two);
     __ ldrb(temp1, MemOperand(src), ne);
     __ strh(temp1, MemOperand(dest), ne);
     __ Pop(pc, r4);
   }
 
   CodeDesc desc;
   masm.GetCode(&desc);
 
@@ skipping 625 matching lines @@
     patcher.masm()->add(r0, pc, Operand(-8));
     patcher.masm()->ldr(pc, MemOperand(pc, -4));
     patcher.masm()->emit_code_stub_address(stub);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM