Experimental implementation: Exposing SIMD instructions into JavaScript

src/x64/deoptimizer-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 73 matching lines @@
 
 void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
   // Set the register values. The values are not important as there are no
   // callee saved registers in JavaScript frames, so all registers are
   // spilled. Registers rbp and rsp are set to the correct values though.
   for (int i = 0; i < Register::kNumRegisters; i++) {
     input_->SetRegister(i, i * 4);
   }
   input_->SetRegister(rsp.code(), reinterpret_cast<intptr_t>(frame->sp()));
   input_->SetRegister(rbp.code(), reinterpret_cast<intptr_t>(frame->fp()));
+  xmm_value_t zero = {{0.0, 0.0}};
   for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) {
-    input_->SetDoubleRegister(i, 0.0);
+    input_->SetXMMRegister(i, zero);
   }
 
   // Fill the frame content from the actual data on the frame.
   for (unsigned i = 0; i < input_->GetFrameSize(); i += kPointerSize) {
     input_->SetFrameSlot(i, Memory::uint64_at(tos + i));
   }
 }
 
 
 void Deoptimizer::SetPlatformCompiledStubRegisters(
     FrameDescription* output_frame, CodeStubInterfaceDescriptor* descriptor) {
   intptr_t handler =
       reinterpret_cast<intptr_t>(descriptor->deoptimization_handler_);
   int params = descriptor->GetHandlerParameterCount();
   output_frame->SetRegister(rax.code(), params);
   output_frame->SetRegister(rbx.code(), handler);
 }
 
 
 void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
   for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) {
-    double double_value = input_->GetDoubleRegister(i);
-    output_frame->SetDoubleRegister(i, double_value);
+    xmm_value_t xmm_value = input_->GetXMMRegister(i);
+    output_frame->SetXMMRegister(i, xmm_value);
   }
 }
 
 
 bool Deoptimizer::HasAlignmentPadding(JSFunction* function) {
   // There is no dynamic alignment padding on x64 in the input frame.
   return false;
 }
 
 
 Code* Deoptimizer::NotifyStubFailureBuiltin() {
   return isolate_->builtins()->builtin(Builtins::kNotifyStubFailureSaveDoubles);
 }
 
 
 #define __ masm()->
 
 void Deoptimizer::EntryGenerator::Generate() {
   GeneratePrologue();
 
   // Save all general purpose registers before messing with them.
   const int kNumberOfRegisters = Register::kNumRegisters;
 
-  const int kDoubleRegsSize = kDoubleSize *
+  const int kXMMRegsSize = kFloat32x4Size *
       XMMRegister::NumAllocatableRegisters();
-  __ subq(rsp, Immediate(kDoubleRegsSize));
+  __ subq(rsp, Immediate(kXMMRegsSize));
 
   for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) {
     XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
-    int offset = i * kDoubleSize;
-    __ movsd(Operand(rsp, offset), xmm_reg);
+    int offset = i * kFloat32x4Size;
+    __ movups(Operand(rsp, offset), xmm_reg);
   }
 
   // We push all registers onto the stack, even though we do not need
   // to restore all later.
   for (int i = 0; i < kNumberOfRegisters; i++) {
     Register r = Register::from_code(i);
     __ push(r);
   }
 
   const int kSavedRegistersAreaSize = kNumberOfRegisters * kPointerSize +
-                                      kDoubleRegsSize;
+                                      kXMMRegsSize;
 
   // We use this to keep the value of the fifth argument temporarily.
   // Unfortunately we can't store it directly in r8 (used for passing
   // this on linux), since it is another parameter passing register on windows.
   Register arg5 = r11;
 
   // Get the bailout id from the stack.
   __ movq(arg_reg_3, Operand(rsp, kSavedRegistersAreaSize));
 
   // Get the address of the location in the code object
@@ skipping 30 matching lines @@
   // frame descriptor pointer.
   __ movq(rbx, Operand(rax, Deoptimizer::input_offset()));
 
   // Fill in the input registers.
   for (int i = kNumberOfRegisters -1; i >= 0; i--) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
     __ pop(Operand(rbx, offset));
   }
 
   // Fill in the double input registers.
-  int double_regs_offset = FrameDescription::double_registers_offset();
+  int xmm_regs_offset = FrameDescription::xmm_registers_offset();
   for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); i++) {
-    int dst_offset = i * kDoubleSize + double_regs_offset;
+    int dst_offset = i * kFloat32x4Size + xmm_regs_offset;
     __ pop(Operand(rbx, dst_offset));
+    __ pop(Operand(rbx, dst_offset + kDoubleSize));
   }
 
   // Remove the bailout id and return address from the stack.
   __ addq(rsp, Immediate(2 * kPointerSize));
 
   // Compute a pointer to the unwinding limit in register rcx; that is
   // the first stack slot not part of the input frame.
   __ movq(rcx, Operand(rbx, FrameDescription::frame_size_offset()));
   __ addq(rcx, rsp);
 
@@ skipping 43 matching lines @@
   __ bind(&inner_loop_header);
   __ testq(rcx, rcx);
   __ j(not_zero, &inner_push_loop);
   __ addq(rax, Immediate(kPointerSize));
   __ bind(&outer_loop_header);
   __ cmpq(rax, rdx);
   __ j(below, &outer_push_loop);
 
   for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) {
     XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
-    int src_offset = i * kDoubleSize + double_regs_offset;
-    __ movsd(xmm_reg, Operand(rbx, src_offset));
+    int src_offset = i * kFloat32x4Size + xmm_regs_offset;
+    __ movups(xmm_reg, Operand(rbx, src_offset));
   }
 
   // Push state, pc, and continuation from the last output frame.
   __ push(Operand(rbx, FrameDescription::state_offset()));
   __ push(Operand(rbx, FrameDescription::pc_offset()));
   __ push(Operand(rbx, FrameDescription::continuation_offset()));
 
   // Push the registers from the last output frame.
   for (int i = 0; i < kNumberOfRegisters; i++) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
@@ skipping 44 matching lines @@
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64