Experimental implementation: Exposing SIMD instructions into JavaScript

src/ia32/deoptimizer-ia32.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 169 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 ebp and esp are set to the correct values though.
 
   for (int i = 0; i < Register::kNumRegisters; i++) {
     input_->SetRegister(i, i * 4);
   }
   input_->SetRegister(esp.code(), reinterpret_cast<intptr_t>(frame->sp()));
   input_->SetRegister(ebp.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::uint32_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(eax.code(), params);
   output_frame->SetRegister(ebx.code(), handler);
 }
 
 
 void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
   if (!CpuFeatures::IsSupported(SSE2)) return;
   for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++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) {
   int parameter_count = function->shared()->formal_parameter_count() + 1;
   unsigned input_frame_size = input_->GetFrameSize();
   unsigned alignment_state_offset =
       input_frame_size - parameter_count * kPointerSize -
       StandardFrameConstants::kFixedFrameSize -
@@ skipping 13 matching lines @@
 
 
 #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::kNumAllocatableRegisters;
-  __ sub(esp, Immediate(kDoubleRegsSize));
+  __ sub(esp, Immediate(kXMMRegsSize));
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatureScope scope(masm(), SSE2);
     for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
       XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
-      int offset = i * kDoubleSize;
-      __ movsd(Operand(esp, offset), xmm_reg);
+      int offset = i * kFloat32x4Size;
+      __ movups(Operand(esp, offset), xmm_reg);
     }
   }
 
   __ pushad();
 
   const int kSavedRegistersAreaSize = kNumberOfRegisters * kPointerSize +
-                                      kDoubleRegsSize;
+                                      kXMMRegsSize;
 
   // Get the bailout id from the stack.
   __ mov(ebx, Operand(esp, kSavedRegistersAreaSize));
 
   // Get the address of the location in the code object
   // and compute the fp-to-sp delta in register edx.
   __ mov(ecx, Operand(esp, kSavedRegistersAreaSize + 1 * kPointerSize));
   __ lea(edx, Operand(esp, kSavedRegistersAreaSize + 2 * kPointerSize));
 
   __ sub(edx, ebp);
@@ skipping 17 matching lines @@
   // Preserve deoptimizer object in register eax and get the input
   // frame descriptor pointer.
   __ mov(ebx, Operand(eax, 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(ebx, offset));
   }
 
-  int double_regs_offset = FrameDescription::double_registers_offset();
+  int xmm_regs_offset = FrameDescription::xmm_registers_offset();
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatureScope scope(masm(), SSE2);
     // Fill in the double input registers.
     for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
-      int dst_offset = i * kDoubleSize + double_regs_offset;
-      int src_offset = i * kDoubleSize;
-      __ movsd(xmm0, Operand(esp, src_offset));
-      __ movsd(Operand(ebx, dst_offset), xmm0);
+      int dst_offset = i * kFloat32x4Size + xmm_regs_offset;
+      int src_offset = i * kFloat32x4Size;
+      __ movups(xmm0, Operand(esp, src_offset));
+      __ movups(Operand(ebx, dst_offset), xmm0);
     }
   }
 
   // Clear FPU all exceptions.
   // TODO(ulan): Find out why the TOP register is not zero here in some cases,
   // and check that the generated code never deoptimizes with unbalanced stack.
   __ fnclex();
 
   // Remove the bailout id, return address and the double registers.
-  __ add(esp, Immediate(kDoubleRegsSize + 2 * kPointerSize));
+  __ add(esp, Immediate(kXMMRegsSize + 2 * kPointerSize));
 
   // Compute a pointer to the unwinding limit in register ecx; that is
   // the first stack slot not part of the input frame.
   __ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset()));
   __ add(ecx, esp);
 
   // Unwind the stack down to - but not including - the unwinding
   // limit and copy the contents of the activation frame to the input
   // frame description.
   __ lea(edx, Operand(ebx, FrameDescription::frame_content_offset()));
@@ skipping 53 matching lines @@
   __ add(eax, Immediate(kPointerSize));
   __ bind(&outer_loop_header);
   __ cmp(eax, edx);
   __ j(below, &outer_push_loop);
 
   // In case of a failed STUB, we have to restore the XMM registers.
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatureScope scope(masm(), SSE2);
     for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
       XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
-      int src_offset = i * kDoubleSize + double_regs_offset;
-      __ movsd(xmm_reg, Operand(ebx, src_offset));
+      int src_offset = i * kFloat32x4Size+ xmm_regs_offset;
+      __ movups(xmm_reg, Operand(ebx, src_offset));
     }
   }
 
   // Push state, pc, and continuation from the last output frame.
   __ push(Operand(ebx, FrameDescription::state_offset()));
   __ push(Operand(ebx, FrameDescription::pc_offset()));
   __ push(Operand(ebx, FrameDescription::continuation_offset()));
 
 
   // Push the registers from the last output frame.
@@ skipping 33 matching lines @@
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32