X64: A number of small tweaks.

Fix bug in disassembler output (using non-generic registers for memory operands in some cases).
Fix bug in movsxbq and make REX optional in movzx?q.

Review URL: http://codereview.chromium.org/2834027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4977 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/assembler-x64.cc

@@ -1563,7 +1563,7 @@ void Assembler::movq(Register dst, Handle<Object> value, RelocInfo::Mode mode) {
 void Assembler::movsxbq(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
-  emit_rex_32(dst, src);
+  emit_rex_64(dst, src);
   emit(0x0F);
   emit(0xBE);
   emit_operand(dst, src);
@@ -1601,7 +1601,7 @@ void Assembler::movsxlq(Register dst, const Operand& src) {
 void Assembler::movzxbq(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
-  emit_rex_64(dst, src);
+  emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0xB6);
   emit_operand(dst, src);
@@ -1621,7 +1621,7 @@ void Assembler::movzxbl(Register dst, const Operand& src) {
 void Assembler::movzxwq(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
-  emit_rex_64(dst, src);
+  emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0xB7);
   emit_operand(dst, src);

src/x64/codegen-x64.cc

@@ -856,7 +856,7 @@ void CodeGenerator::CallApplyLazy(Expression* applicand,
       __ j(equal, &adapted);
 
       // No arguments adaptor frame. Copy fixed number of arguments.
-      __ movq(rax, Immediate(scope()->num_parameters()));
+      __ Set(rax, scope()->num_parameters());
       for (int i = 0; i < scope()->num_parameters(); i++) {
         __ push(frame_->ParameterAt(i));
       }
@@ -9067,16 +9067,16 @@ void CompareStub::Generate(MacroAssembler* masm) {
     Label non_number_comparison;
     Label unordered;
     FloatingPointHelper::LoadSSE2UnknownOperands(masm, &non_number_comparison);
+    __ xorl(rax, rax);
+    __ xorl(rcx, rcx);
     __ ucomisd(xmm0, xmm1);
 
     // Don't base result on EFLAGS when a NaN is involved.
     __ j(parity_even, &unordered);
     // Return a result of -1, 0, or 1, based on EFLAGS.
-    __ movq(rax, Immediate(0));  // equal
-    __ movq(rcx, Immediate(1));
-    __ cmovq(above, rax, rcx);
-    __ movq(rcx, Immediate(-1));
-    __ cmovq(below, rax, rcx);
+    __ setcc(above, rax);
+    __ setcc(below, rcx);
+    __ subq(rax, rcx);
     __ ret(2 * kPointerSize);  // rax, rdx were pushed
 
     // If one of the numbers was NaN, then the result is always false.

src/x64/disasm-x64.cc

@@ -468,20 +468,20 @@ int DisassemblerX64::PrintRightOperandHelper(
         if (index == 4 && (base & 7) == 4 && scale == 0 /*times_1*/) {
           // index == rsp means no index. Only use sib byte with no index for
           // rsp and r12 base.
-          AppendToBuffer("[%s]", (this->*register_name)(base));
+          AppendToBuffer("[%s]", NameOfCPURegister(base));
           return 2;
         } else if (base == 5) {
           // base == rbp means no base register (when mod == 0).
           int32_t disp = *reinterpret_cast<int32_t*>(modrmp + 2);
           AppendToBuffer("[%s*%d+0x%x]",
-                         (this->*register_name)(index),
+                         NameOfCPURegister(index),
                          1 << scale, disp);
           return 6;
         } else if (index != 4 && base != 5) {
           // [base+index*scale]
           AppendToBuffer("[%s+%s*%d]",
-                         (this->*register_name)(base),
-                         (this->*register_name)(index),
+                         NameOfCPURegister(base),
+                         NameOfCPURegister(index),
                          1 << scale);
           return 2;
         } else {
@@ -489,7 +489,7 @@ int DisassemblerX64::PrintRightOperandHelper(
           return 1;
         }
       } else {
-        AppendToBuffer("[%s]", (this->*register_name)(rm));
+        AppendToBuffer("[%s]", NameOfCPURegister(rm));
         return 1;
       }
       break;
@@ -503,21 +503,21 @@ int DisassemblerX64::PrintRightOperandHelper(
                               : *reinterpret_cast<char*>(modrmp + 2);
         if (index == 4 && (base & 7) == 4 && scale == 0 /*times_1*/) {
           if (-disp > 0) {
-            AppendToBuffer("[%s-0x%x]", (this->*register_name)(base), -disp);
+            AppendToBuffer("[%s-0x%x]", NameOfCPURegister(base), -disp);
           } else {
-            AppendToBuffer("[%s+0x%x]", (this->*register_name)(base), disp);
+            AppendToBuffer("[%s+0x%x]", NameOfCPURegister(base), disp);
           }
         } else {
           if (-disp > 0) {
             AppendToBuffer("[%s+%s*%d-0x%x]",
-                           (this->*register_name)(base),
-                           (this->*register_name)(index),
+                           NameOfCPURegister(base),
+                           NameOfCPURegister(index),
                            1 << scale,
                            -disp);
           } else {
             AppendToBuffer("[%s+%s*%d+0x%x]",
-                           (this->*register_name)(base),
-                           (this->*register_name)(index),
+                           NameOfCPURegister(base),
+                           NameOfCPURegister(index),
                            1 << scale,
                            disp);
           }
@@ -528,9 +528,9 @@ int DisassemblerX64::PrintRightOperandHelper(
         int disp = (mod == 2) ? *reinterpret_cast<int32_t*>(modrmp + 1)
                               : *reinterpret_cast<char*>(modrmp + 1);
         if (-disp > 0) {
-        AppendToBuffer("[%s-0x%x]", (this->*register_name)(rm), -disp);
+        AppendToBuffer("[%s-0x%x]", NameOfCPURegister(rm), -disp);
         } else {
-        AppendToBuffer("[%s+0x%x]", (this->*register_name)(rm), disp);
+        AppendToBuffer("[%s+0x%x]", NameOfCPURegister(rm), disp);
         }
         return (mod == 2) ? 5 : 2;
       }

src/x64/macro-assembler-x64.cc

@@ -351,7 +351,7 @@ void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
-  movq(rax, Immediate(num_arguments));
+  Set(rax, num_arguments);
   movq(rbx, ExternalReference(f));
   CEntryStub ces(f->result_size);
   CallStub(&ces);
@@ -360,7 +360,7 @@ void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
-  movq(rax, Immediate(num_arguments));
+  Set(rax, num_arguments);
   movq(rbx, ext);
 
   CEntryStub stub(1);
@@ -382,7 +382,7 @@ void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
-  movq(rax, Immediate(num_arguments));
+  Set(rax, num_arguments);
   JumpToExternalReference(ext, result_size);
 }
 
@@ -640,9 +640,9 @@ Condition MacroAssembler::CheckBothSmi(Register first, Register second) {
   if (first.is(second)) {
     return CheckSmi(first);
   }
-  movl(kScratchRegister, first);
-  orl(kScratchRegister, second);
-  testb(kScratchRegister, Immediate(kSmiTagMask));
+  ASSERT(kSmiTag == 0 && kHeapObjectTag == 1 && kHeapObjectTagMask == 3);
+  leal(kScratchRegister, Operand(first, second, times_1, 0));
+  testb(kScratchRegister, Immediate(0x03));
   return zero;
 }
 
@@ -1937,7 +1937,7 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
     if (expected.immediate() == actual.immediate()) {
       definitely_matches = true;
     } else {
-      movq(rax, Immediate(actual.immediate()));
+      Set(rax, actual.immediate());
       if (expected.immediate() ==
               SharedFunctionInfo::kDontAdaptArgumentsSentinel) {
         // Don't worry about adapting arguments for built-ins that
@@ -1946,7 +1946,7 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
         // arguments.
         definitely_matches = true;
       } else {
-        movq(rbx, Immediate(expected.immediate()));
+        Set(rbx, expected.immediate());
       }
     }
   } else {
@@ -1957,7 +1957,7 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
       cmpq(expected.reg(), Immediate(actual.immediate()));
       j(equal, &invoke);
       ASSERT(expected.reg().is(rbx));
-      movq(rax, Immediate(actual.immediate()));
+      Set(rax, actual.immediate());
     } else if (!expected.reg().is(actual.reg())) {
       // Both expected and actual are in (different) registers. This
       // is the case when we invoke functions using call and apply.

src/x64/virtual-frame-x64.cc

@@ -1221,7 +1221,7 @@ Result VirtualFrame::CallConstructor(int arg_count) {
   // call trampolines per different arguments counts encountered.
   Result num_args = cgen()->allocator()->Allocate(rax);
   ASSERT(num_args.is_valid());
-  __ movq(num_args.reg(), Immediate(arg_count));
+  __ Set(num_args.reg(), arg_count);
 
   function.Unuse();
   num_args.Unuse();