[builtins] Introduce proper Float64Log1p operator.

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index afe734652fd6d73594bff38f1577a07c12bcef07..69c16a0faaf03f5a8e852223316034941caf63fb 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -363,6 +363,21 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
     }                                                                 \
   } while (0)
 
+#define ASSEMBLE_IEEE754_UNOP(name)                                           \
+  do {                                                                        \
+    /* Pass one double as argument on the stack.*/                            \
+    __ PrepareCallCFunction(2, eax);                                          \
+    __ movsd(Operand(esp, 0 * kDoubleSize), i.InputDoubleRegister(0));        \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     2);                                                      \
+    /* Return value is in st(0) on ia32. */                                   \
+    /* Store it into the result register. */                                  \
+    __ sub(esp, Immediate(kDoubleSize));                                      \
+    __ fstp_d(Operand(esp, 0));                                               \
+    __ movsd(i.OutputDoubleRegister(), Operand(esp, 0));                      \
+    __ add(esp, Immediate(kDoubleSize));                                      \
+  } while (false)
+
 void CodeGenerator::AssembleDeconstructFrame() {
   __ mov(esp, ebp);
   __ pop(ebp);
@@ -617,19 +632,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ lea(i.OutputRegister(), Operand(base, offset.offset()));
       break;
     }
-    case kIeee754Float64Log: {
-      // Pass one double as argument on the stack.
-      __ PrepareCallCFunction(2, eax);
-      __ movsd(Operand(esp, 0 * kDoubleSize), i.InputDoubleRegister(0));
-      __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 2);
-      // Return value is in st(0) on ia32.
-      // Store it into the result register.
-      __ sub(esp, Immediate(kDoubleSize));
-      __ fstp_d(Operand(esp, 0));
-      __ movsd(i.OutputDoubleRegister(), Operand(esp, 0));
-      __ add(esp, Immediate(kDoubleSize));
+    case kIeee754Float64Log:
+      ASSEMBLE_IEEE754_UNOP(log);
+      break;
+    case kIeee754Float64Log1p:
+      ASSEMBLE_IEEE754_UNOP(log1p);
       break;
-    }
     case kIA32Add:
       if (HasImmediateInput(instr, 1)) {
         __ add(i.InputOperand(0), i.InputImmediate(1));