X87: [builtins] Introduce proper base::ieee754::log.

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

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 685 matching lines @@
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
       Register base;
       if (offset.from_stack_pointer()) {
         base = esp;
       } else {
         base = ebp;
       }
       __ lea(i.OutputRegister(), Operand(base, offset.offset()));
       break;
     }
+    case kIeee754Float64Log: {
+      // Saves the esp into ebx
+      __ push(ebx);
+      __ mov(ebx, esp);
+      // Pass one double as argument on the stack.
+      __ PrepareCallCFunction(2, eax);
+      __ fstp(0);
+      // Load operand from original stack
+      __ fld_d(MemOperand(ebx, 4));
+      // Put operand into stack for function call
+      __ fstp_d(Operand(esp, 0));
+      __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 2);
+      // Restore the ebx
+      __ pop(ebx);
+      // Return value is in st(0) on x87.
+      __ lea(esp, Operand(esp, kDoubleSize));
+      break;
+    }
     case kX87Add:
       if (HasImmediateInput(instr, 1)) {
         __ add(i.InputOperand(0), i.InputImmediate(1));
       } else {
         __ add(i.InputRegister(0), i.InputOperand(1));
       }
       break;
     case kX87And:
       if (HasImmediateInput(instr, 1)) {
         __ and_(i.InputOperand(0), i.InputImmediate(1));
@@ skipping 180 matching lines @@
       } else {
         __ ror_cl(i.OutputOperand());
       }
       break;
     case kX87Lzcnt:
       __ Lzcnt(i.OutputRegister(), i.InputOperand(0));
       break;
     case kX87Popcnt:
       __ Popcnt(i.OutputRegister(), i.InputOperand(0));
       break;
-    case kX87Float64Log:
-      if (FLAG_debug_code && FLAG_enable_slow_asserts) {
-        __ VerifyX87StackDepth(1);
-      }
-      __ X87SetFPUCW(0x027F);
-      __ fstp(0);
-      __ fldln2();
-      __ fld_d(MemOperand(esp, 0));
-      __ fyl2x();
-      __ lea(esp, Operand(esp, kDoubleSize));
-      __ X87SetFPUCW(0x037F);
-      break;
     case kX87LoadFloat64Constant: {
       InstructionOperand* source = instr->InputAt(0);
       InstructionOperand* destination = instr->Output();
       DCHECK(source->IsConstant());
       X87OperandConverter g(this, nullptr);
       Constant src_constant = g.ToConstant(source);
 
       DCHECK_EQ(Constant::kFloat64, src_constant.type());
       uint64_t src = bit_cast<uint64_t>(src_constant.ToFloat64());
       uint32_t lower = static_cast<uint32_t>(src);
@@ skipping 1584 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8