[builtins] Introduce proper Float64Log1p operator.

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 8c45b96e21547e0e50e2b0442acee7268a5c709d..9401e20556bc927d858705f3b77fb9beab80096e 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -485,6 +485,17 @@ FPUCondition FlagsConditionToConditionCmpFPU(bool& predicate,
     __ sync();                                           \
   } while (0)
 
+#define ASSEMBLE_IEEE754_UNOP(name)                                           \
+  do {                                                                        \
+    FrameScope scope(masm(), StackFrame::MANUAL);                             \
+    __ PrepareCallCFunction(0, 1, kScratchReg);                               \
+    __ MovToFloatParameter(i.InputDoubleRegister(0));                         \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     0, 1);                                                   \
+    /* Move the result in the double result register. */                      \
+    __ MovFromFloatResult(i.OutputDoubleRegister());                          \
+  } while (0)
+
 void CodeGenerator::AssembleDeconstructFrame() {
   __ mov(sp, fp);
   __ Pop(ra, fp);
@@ -718,18 +729,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
               Operand(offset.offset()));
       break;
     }
-    case kIeee754Float64Log: {
-      // TODO(bmeurer): We should really get rid of this special instruction,
-      // and generate a CallAddress instruction instead.
-      FrameScope scope(masm(), StackFrame::MANUAL);
-      __ PrepareCallCFunction(0, 1, kScratchReg);
-      __ MovToFloatParameter(i.InputDoubleRegister(0));
-      __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 0,
-                       1);
-      // Move the result in the double result register.
-      __ MovFromFloatResult(i.OutputDoubleRegister());
+    case kIeee754Float64Log:
+      ASSEMBLE_IEEE754_UNOP(log);
+      break;
+    case kIeee754Float64Log1p:
+      ASSEMBLE_IEEE754_UNOP(log1p);
       break;
-    }
     case kMipsAdd:
       __ Addu(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;