PPC/S390: [builtins] Introduce proper Float64Log2 and Float64Log10 operators.

port d9bf520a

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com, bjaideep@ca.ibm.com

BUG=v8:5095

Review-Url: https://codereview.chromium.org/2070893002
Cr-Commit-Position: refs/heads/master@{#37043}

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

@@ -1269,6 +1269,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kIeee754Float64Log1p:
       ASSEMBLE_IEEE754_UNOP(log1p);
       break;
+    case kIeee754Float64Log2:
+      ASSEMBLE_IEEE754_UNOP(log2);
+      break;
+    case kIeee754Float64Log10:
+      ASSEMBLE_IEEE754_UNOP(log10);
+      break;
     case kPPC_Neg:
       __ neg(i.OutputRegister(), i.InputRegister(0), LeaveOE, i.OutputRCBit());
       break;

src/compiler/s390/code-generator-s390.cc

@@ -1258,6 +1258,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kIeee754Float64Log1p:
       ASSEMBLE_IEEE754_UNOP(log1p);
       break;
+    case kIeee754Float64Log2:
+      ASSEMBLE_IEEE754_UNOP(log2);
+      break;
+    case kIeee754Float64Log10:
+      ASSEMBLE_IEEE754_UNOP(log10);
+      break;
     case kS390_Neg:
       __ LoadComplementRR(i.OutputRegister(), i.InputRegister(0));
       break;