[builtins] Introduce proper Float64Log1p operator.

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 26ec8c5c4844158529894a4c12b475ac8e8da691..d6959b3db9ef074ef1429ceaec5520eb9afd850f 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -407,6 +407,20 @@ Condition FlagsConditionToCondition(FlagsCondition condition) {
     __ dmb(ISH);                                                      \
   } while (0)
 
+#define ASSEMBLE_IEEE754_UNOP(name)                                            \
+  do {                                                                         \
+    /* 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.InputFloat64Register(0));                         \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()),  \
+                     0, 1);                                                    \
+    /* Move the result in the double result register. */                       \
+    __ MovFromFloatResult(i.OutputFloat64Register());                          \
+    DCHECK_EQ(LeaveCC, i.OutputSBit());                                        \
+  } while (0)
+
 void CodeGenerator::AssembleDeconstructFrame() {
   __ LeaveFrame(StackFrame::MANUAL);
 }
@@ -674,19 +688,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ add(i.OutputRegister(0), base, 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.InputFloat64Register(0));
-      __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 0,
-                       1);
-      // Move the result in the double result register.
-      __ MovFromFloatResult(i.OutputFloat64Register());
-      DCHECK_EQ(LeaveCC, i.OutputSBit());
+    case kIeee754Float64Log:
+      ASSEMBLE_IEEE754_UNOP(log);
+      break;
+    case kIeee754Float64Log1p:
+      ASSEMBLE_IEEE754_UNOP(log1p);
       break;
-    }
     case kArmAdd:
       __ add(i.OutputRegister(), i.InputRegister(0), i.InputOperand2(1),
              i.OutputSBit());