Bug 512409 - nanojit support for Windows x64. r=dvander

js/src/nanojit/NativeX64.cpp

@@ -70,7 +70,7 @@ tracing
 namespace nanojit
 {
     const Register Assembler::retRegs[] = { RAX };
-#ifdef _MSC_VER
+#ifdef _WIN64
     const Register Assembler::argRegs[] = { RCX, RDX, R8, R9 };
     const Register Assembler::savedRegs[] = { RBX, RSI, RDI, R12, R13, R14, R15 };
 #else
@@ -588,7 +588,7 @@ namespace nanojit
             emit(X64_callrax);
         }
 
-    #ifdef _MSC_VER
+    #ifdef _WIN64
         int stk_used = 32; // always reserve 32byte shadow area
     #else
         int stk_used = 0;
@@ -604,7 +604,7 @@ namespace nanojit
                 asm_regarg(sz, arg, argRegs[arg_index]);
                 arg_index++;
             }
-        #ifdef _MSC_VER
+        #ifdef _WIN64
             else if (sz == ARGSIZE_F && arg_index < NumArgRegs) {
                 // double goes in XMM reg # based on overall arg_index
                 asm_regarg(sz, arg, Register(XMM0+arg_index));
@@ -1153,8 +1153,8 @@ namespace nanojit
         uint32_t kind = ins->paramKind();
         if (kind == 0) {
             // ordinary param
-            // first six args always in registers for mac x64
-            if (a < 6) {
+            // first four or six args always in registers for x86_64 ABI
+            if (a < NumArgRegs) {
                 // incoming arg in register
                 prepResultReg(ins, rmask(argRegs[a]));
             } else {
@@ -1281,7 +1281,7 @@ namespace nanojit
     void Assembler::nRegisterResetAll(RegAlloc &a) {
         // add scratch registers to our free list for the allocator
         a.clear();
-#ifdef _MSC_VER
+#ifdef _WIN64
         a.free = 0x001fffcf; // rax-rbx, rsi, rdi, r8-r15, xmm0-xmm5
 #else
         a.free = 0xffffffff & ~(1<<RSP | 1<<RBP);
@@ -1316,7 +1316,7 @@ namespace nanojit
     }
 
     Register Assembler::nRegisterAllocFromSet(RegisterMask set) {
-    #if defined _WIN64
+    #if defined _MSC_VER
         DWORD tr;
         _BitScanForward(&tr, set);
         _allocator.free &= ~rmask((Register)tr);