Save and restore callee-save xmm registers on Win64

src/x64/code-stubs-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4254 matching lines @@
   __ ThrowUncatchable(rax);
 
   __ bind(&throw_normal_exception);
   __ Throw(rax);
 }
 
 
 void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   Label invoke, handler_entry, exit;
   Label not_outermost_js, not_outermost_js_2;
+
+#ifdef _WIN64
+  const int kCalleeSaveXMMRegisters = 10;
+  const int kFullXMMRegisterSize = 16;
+#endif
   {  // NOLINT. Scope block confuses linter.
     MacroAssembler::NoRootArrayScope uninitialized_root_register(masm);
     // Set up frame.
     __ push(rbp);
     __ movq(rbp, rsp);
 
     // Push the stack frame type marker twice.
     int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
     // Scratch register is neither callee-save, nor an argument register on any
     // platform. It's free to use at this point.
     // Cannot use smi-register for loading yet.
     __ movq(kScratchRegister,
             reinterpret_cast<uint64_t>(Smi::FromInt(marker)),
             RelocInfo::NONE64);
     __ push(kScratchRegister);  // context slot
     __ push(kScratchRegister);  // function slot
     // Save callee-saved registers (X64/Win64 calling conventions).
     __ push(r12);
     __ push(r13);
     __ push(r14);
     __ push(r15);
 #ifdef _WIN64
     __ push(rdi);  // Only callee save in Win64 ABI, argument in AMD64 ABI.
     __ push(rsi);  // Only callee save in Win64 ABI, argument in AMD64 ABI.
 #endif
     __ push(rbx);
-    // TODO(X64): On Win64, if we ever use XMM6-XMM15, the low low 64 bits are
-    // callee save as well.
+
+#ifdef _WIN64
+    // On Win64 XMM6-XMM15 are callee-save
+  __ subq(rsp, Immediate(kCalleeSaveXMMRegisters * kFullXMMRegisterSize);

[Michael Starzinger, 2013/04/17 08:26:02]

nit: Indentation of the whole block is off.

+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 0), xmm6);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 1), xmm7);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 2), xmm8);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 3), xmm9);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 4), xmm10);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 5), xmm11);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 6), xmm12);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 7), xmm13);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 8), xmm14);
+  __ movdqu(Operand(rsp, kFullXMMRegisterSize * 9), xmm15);
+#endif
 
     // Set up the roots and smi constant registers.
     // Needs to be done before any further smi loads.
     __ InitializeSmiConstantRegister();
     __ InitializeRootRegister();
   }
 
   Isolate* isolate = masm->isolate();
 
   // Save copies of the top frame descriptor on the stack.
@@ skipping 69 matching lines @@
   __ movq(kScratchRegister, js_entry_sp);
   __ movq(Operand(kScratchRegister, 0), Immediate(0));
   __ bind(&not_outermost_js_2);
 
   // Restore the top frame descriptor from the stack.
   { Operand c_entry_fp_operand = masm->ExternalOperand(c_entry_fp);
     __ pop(c_entry_fp_operand);
   }
 
   // Restore callee-saved registers (X64 conventions).
+#ifdef _WIN64
+    // On Win64 XMM6-XMM15 are callee-save

[Michael Starzinger, 2013/04/17 08:26:02]

nit: Indentation of the comment is off.

+  __ movdqu(xmm6, Operand(rsp, kFullXMMRegisterSize * 0));
+  __ movdqu(xmm7, Operand(rsp, kFullXMMRegisterSize * 1));
+  __ movdqu(xmm8, Operand(rsp, kFullXMMRegisterSize * 2));
+  __ movdqu(xmm8, Operand(rsp, kFullXMMRegisterSize * 3));
+  __ movdqu(xmm10, Operand(rsp, kFullXMMRegisterSize * 4));
+  __ movdqu(xmm11, Operand(rsp, kFullXMMRegisterSize * 5));
+  __ movdqu(xmm12, Operand(rsp, kFullXMMRegisterSize * 6));
+  __ movdqu(xmm13, Operand(rsp, kFullXMMRegisterSize * 7));
+  __ movdqu(xmm14, Operand(rsp, kFullXMMRegisterSize * 8));
+  __ movdqu(xmm15, Operand(rsp, kFullXMMRegisterSize * 9));
+  __ addq(rsp, Immediate(kCalleeSaveXMMRegisters * kFullXMMRegisterSize));
+#endif
+
   __ pop(rbx);
 #ifdef _WIN64
   // Callee save on in Win64 ABI, arguments/volatile in AMD64 ABI.
   __ pop(rsi);
   __ pop(rdi);
 #endif
   __ pop(r15);
   __ pop(r14);
   __ pop(r13);
   __ pop(r12);
@@ skipping 2313 matching lines @@
 #endif
 
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64