Re-reland: Remove register index/code indirection

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index fd5cf1ae82e84e8ec1efa933a69af387367f43d6..82ab9135461da2e794c5caaff0c88a2daa0acf6e 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -42,10 +42,48 @@
 #include "src/assembler.h"
 #include "src/compiler.h"
 #include "src/isolate.h"
+#include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
+#define GENERAL_REGISTERS(V) \
+  V(eax)                     \
+  V(ecx)                     \
+  V(edx)                     \
+  V(ebx)                     \
+  V(esp)                     \
+  V(ebp)                     \
+  V(esi)                     \
+  V(edi)
+
+#define ALLOCATABLE_GENERAL_REGISTERS(V) \
+  V(eax)                                 \
+  V(ecx)                                 \
+  V(edx)                                 \
+  V(ebx)                                 \
+  V(esi)                                 \
+  V(edi)
+
+#define DOUBLE_REGISTERS(V) \
+  V(xmm0)                   \
+  V(xmm1)                   \
+  V(xmm2)                   \
+  V(xmm3)                   \
+  V(xmm4)                   \
+  V(xmm5)                   \
+  V(xmm6)                   \
+  V(xmm7)
+
+#define ALLOCATABLE_DOUBLE_REGISTERS(V) \
+  V(xmm1)                               \
+  V(xmm2)                               \
+  V(xmm3)                               \
+  V(xmm4)                               \
+  V(xmm5)                               \
+  V(xmm6)                               \
+  V(xmm7)
+
 // CPU Registers.
 //
 // 1) We would prefer to use an enum, but enum values are assignment-
@@ -68,151 +106,86 @@ namespace internal {
 // and best performance in optimized code.
 //
 struct Register {
-  static const int kMaxNumAllocatableRegisters = 6;
-  static int NumAllocatableRegisters() {
-    return kMaxNumAllocatableRegisters;
-  }
-  static const int kNumRegisters = 8;
-
-  static inline const char* AllocationIndexToString(int index);
+  enum Code {
+#define REGISTER_CODE(R) kCode_##R,
+    GENERAL_REGISTERS(REGISTER_CODE)
+#undef REGISTER_CODE
+        kAfterLast,
+    kCode_no_reg = -1
+  };
 
-  static inline int ToAllocationIndex(Register reg);
-
-  static inline Register FromAllocationIndex(int index);
+  static const int kNumRegisters = Code::kAfterLast;
 
   static Register from_code(int code) {
     DCHECK(code >= 0);
     DCHECK(code < kNumRegisters);
-    Register r = { code };
+    Register r = {code};
     return r;
   }
-  bool is_valid() const { return 0 <= code_ && code_ < kNumRegisters; }
-  bool is(Register reg) const { return code_ == reg.code_; }
-  // eax, ebx, ecx and edx are byte registers, the rest are not.
-  bool is_byte_register() const { return code_ <= 3; }
+  const char* ToString();
+  bool IsAllocatable() const;
+  bool is_valid() const { return 0 <= reg_code && reg_code < kNumRegisters; }
+  bool is(Register reg) const { return reg_code == reg.reg_code; }
   int code() const {
     DCHECK(is_valid());
-    return code_;
+    return reg_code;
   }
   int bit() const {
     DCHECK(is_valid());
-    return 1 << code_;
+    return 1 << reg_code;
   }
 
+  bool is_byte_register() const { return reg_code <= 3; }
+
   // Unfortunately we can't make this private in a struct.
-  int code_;
+  int reg_code;
 };
 
-const int kRegister_eax_Code = 0;
-const int kRegister_ecx_Code = 1;
-const int kRegister_edx_Code = 2;
-const int kRegister_ebx_Code = 3;
-const int kRegister_esp_Code = 4;
-const int kRegister_ebp_Code = 5;
-const int kRegister_esi_Code = 6;
-const int kRegister_edi_Code = 7;
-const int kRegister_no_reg_Code = -1;
-
-const Register eax = { kRegister_eax_Code };
-const Register ecx = { kRegister_ecx_Code };
-const Register edx = { kRegister_edx_Code };
-const Register ebx = { kRegister_ebx_Code };
-const Register esp = { kRegister_esp_Code };
-const Register ebp = { kRegister_ebp_Code };
-const Register esi = { kRegister_esi_Code };
-const Register edi = { kRegister_edi_Code };
-const Register no_reg = { kRegister_no_reg_Code };
-
-
-inline const char* Register::AllocationIndexToString(int index) {
-  DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
-  // This is the mapping of allocation indices to registers.
-  const char* const kNames[] = { "eax", "ecx", "edx", "ebx", "esi", "edi" };
-  return kNames[index];
-}
-
-
-inline int Register::ToAllocationIndex(Register reg) {
-  DCHECK(reg.is_valid() && !reg.is(esp) && !reg.is(ebp));
-  return (reg.code() >= 6) ? reg.code() - 2 : reg.code();
-}
-
-
-inline Register Register::FromAllocationIndex(int index)  {
-  DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
-  return (index >= 4) ? from_code(index + 2) : from_code(index);
-}
-
 
-struct XMMRegister {
-  static const int kMaxNumAllocatableRegisters = 7;
-  static const int kMaxNumRegisters = 8;
-  static int NumAllocatableRegisters() {
-    return kMaxNumAllocatableRegisters;
-  }
+#define DECLARE_REGISTER(R) const Register R = {Register::kCode_##R};
+GENERAL_REGISTERS(DECLARE_REGISTER)
+#undef DECLARE_REGISTER
+const Register no_reg = {Register::kCode_no_reg};
 
-  // TODO(turbofan): Proper support for float32.
-  static int NumAllocatableAliasedRegisters() {
-    return NumAllocatableRegisters();
-  }
 
-  static int ToAllocationIndex(XMMRegister reg) {
-    DCHECK(reg.code() != 0);
-    return reg.code() - 1;
-  }
+struct DoubleRegister {
+  enum Code {
+#define REGISTER_CODE(R) kCode_##R,
+    DOUBLE_REGISTERS(REGISTER_CODE)
+#undef REGISTER_CODE
+        kAfterLast,
+    kCode_no_reg = -1
+  };
 
-  static XMMRegister FromAllocationIndex(int index) {
-    DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
-    return from_code(index + 1);
-  }
+  static const int kMaxNumRegisters = Code::kAfterLast;
 
-  static XMMRegister from_code(int code) {
-    XMMRegister result = { code };
+  static DoubleRegister from_code(int code) {
+    DoubleRegister result = {code};
     return result;
   }
 
-  bool is_valid() const {
-    return 0 <= code_ && code_ < kMaxNumRegisters;
-  }
+  bool IsAllocatable() const;
+  bool is_valid() const { return 0 <= reg_code && reg_code < kMaxNumRegisters; }
 
   int code() const {
     DCHECK(is_valid());
-    return code_;
+    return reg_code;
   }
 
-  bool is(XMMRegister reg) const { return code_ == reg.code_; }
+  bool is(DoubleRegister reg) const { return reg_code == reg.reg_code; }
 
-  static const char* AllocationIndexToString(int index) {
-    DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
-    const char* const names[] = {
-      "xmm1",
-      "xmm2",
-      "xmm3",
-      "xmm4",
-      "xmm5",
-      "xmm6",
-      "xmm7"
-    };
-    return names[index];
-  }
+  const char* ToString();
 
-  int code_;
+  int reg_code;
 };
 
+#define DECLARE_REGISTER(R) \
+  const DoubleRegister R = {DoubleRegister::kCode_##R};
+DOUBLE_REGISTERS(DECLARE_REGISTER)
+#undef DECLARE_REGISTER
+const DoubleRegister no_double_reg = {DoubleRegister::kCode_no_reg};
 
-typedef XMMRegister DoubleRegister;
-
-
-const XMMRegister xmm0 = { 0 };
-const XMMRegister xmm1 = { 1 };
-const XMMRegister xmm2 = { 2 };
-const XMMRegister xmm3 = { 3 };
-const XMMRegister xmm4 = { 4 };
-const XMMRegister xmm5 = { 5 };
-const XMMRegister xmm6 = { 6 };
-const XMMRegister xmm7 = { 7 };
-const XMMRegister no_xmm_reg = { -1 };
-
+typedef DoubleRegister XMMRegister;
 
 enum Condition {
   // any value < 0 is considered no_condition