[Arm]: Make Assembler::movw only emit a movw instruction.

Currently Assembler::movw is really the mov macro instruction, leading to raw
emit calls to generate the real movw instruction. Replace all calls of mow
with the mov macro instruction (which will emit a movw if appropriate) and
make movw always emit movw.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/329233002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22085 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/assembler-arm.cc

@@ -1092,8 +1092,7 @@ void Assembler::move_32_bit_immediate(Register rd,
       // Make sure the movw/movt doesn't get separated.
       BlockConstPoolFor(2);
     }
-    emit(cond | 0x30*B20 | target.code()*B12 |
-         EncodeMovwImmediate(x.imm32_ & 0xffff));
+    movw(target, static_cast<uint32_t>(x.imm32_ & 0xffff), cond);
     movt(target, static_cast<uint32_t>(x.imm32_) >> 16, cond);
     if (target.code() != rd.code()) {
       mov(rd, target, LeaveCC, cond);
@@ -1457,11 +1456,7 @@ void Assembler::mov_label_offset(Register dst, Label* label) {
 
 
 void Assembler::movw(Register reg, uint32_t immediate, Condition cond) {
-  ASSERT(immediate < 0x10000);
-  // May use movw if supported, but on unsupported platforms will try to use
-  // equivalent rotated immed_8 value and other tricks before falling back to a
-  // constant pool load.
-  mov(reg, Operand(immediate), LeaveCC, cond);
+  emit(cond | 0x30*B20 | reg.code()*B12 | EncodeMovwImmediate(immediate));
 }
 
 

src/arm/assembler-arm.h

@@ -888,10 +888,8 @@ class Assembler : public AssemblerBase {
   void mov_label_offset(Register dst, Label* label);
 
   // ARMv7 instructions for loading a 32 bit immediate in two instructions.
-  // This may actually emit a different mov instruction, but on an ARMv7 it
-  // is guaranteed to only emit one instruction.
+  // The constant for movw and movt should be in the range 0-0xffff.
   void movw(Register reg, uint32_t immediate, Condition cond = al);
-  // The constant for movt should be in the range 0-0xffff.
   void movt(Register reg, uint32_t immediate, Condition cond = al);
 
   void bic(Register dst, Register src1, const Operand& src2,

src/arm/lithium-codegen-arm.cc

@@ -841,7 +841,7 @@ void LCodeGen::DeoptimizeIf(Condition condition,
     __ mov(scratch, Operand(count));
     __ ldr(r1, MemOperand(scratch));
     __ sub(r1, r1, Operand(1), SetCC);
-    __ movw(r1, FLAG_deopt_every_n_times, eq);
+    __ mov(r1, Operand(FLAG_deopt_every_n_times), LeaveCC, eq);
     __ str(r1, MemOperand(scratch));
     __ pop(r1);