X87: [turbofan] Add basic support for calling to (a subset of) C functions.

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index 22de06f13b614a1b8be726b58196f6ae22c00d65..c8f3696b1191fb087aff0afe06c4d6b16983bac7 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -385,6 +385,22 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ jmp(FieldOperand(func, JSFunction::kCodeEntryOffset));
       break;
     }
+    case kArchPrepareCallCFunction: {
+      int const num_parameters = MiscField::decode(instr->opcode());
+      __ PrepareCallCFunction(num_parameters, i.TempRegister(0));
+      break;
+    }
+    case kArchCallCFunction: {
+      int const num_parameters = MiscField::decode(instr->opcode());
+      if (HasImmediateInput(instr, 0)) {
+        ExternalReference ref = i.InputExternalReference(0);
+        __ CallCFunction(ref, num_parameters);
+      } else {
+        Register func = i.InputRegister(0);
+        __ CallCFunction(func, num_parameters);
+      }
+      break;
+    }
     case kArchJmp:
       AssembleArchJump(i.InputRpo(0));
       break;
@@ -1129,6 +1145,15 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ push(i.InputOperand(0));
       }
       break;
+    case kX87Poke: {
+      int const slot = MiscField::decode(instr->opcode());
+      if (HasImmediateInput(instr, 0)) {
+        __ mov(Operand(esp, slot * kPointerSize), i.InputImmediate(0));
+      } else {
+        __ mov(Operand(esp, slot * kPointerSize), i.InputRegister(0));
+      }
+      break;
+    }
     case kX87PushFloat32:
       __ lea(esp, Operand(esp, -kFloatSize));
       if (instr->InputAt(0)->IsDoubleStackSlot()) {