PPC/s390: [turbofan] Introduce Float64Pow and NumberPow operators.

src/s390/code-stubs-s390.cc

Index: src/s390/code-stubs-s390.cc
diff --git a/src/s390/code-stubs-s390.cc b/src/s390/code-stubs-s390.cc
index 6098c37c4409267082f45ef412a4b527eb795851..ab85852a4945b1dc2eeff6c5f42a34dadeb8eeec 100644
--- a/src/s390/code-stubs-s390.cc
+++ b/src/s390/code-stubs-s390.cc
@@ -711,11 +711,8 @@ void RestoreRegistersStateStub::Generate(MacroAssembler* masm) {
 }
 
 void MathPowStub::Generate(MacroAssembler* masm) {
-  const Register base = r3;
   const Register exponent = MathPowTaggedDescriptor::exponent();
   DCHECK(exponent.is(r4));
-  const Register heapnumbermap = r7;
-  const Register heapnumber = r2;
   const DoubleRegister double_base = d1;
   const DoubleRegister double_exponent = d2;
   const DoubleRegister double_result = d3;
@@ -724,36 +721,7 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   const Register scratch2 = r9;
 
   Label call_runtime, done, int_exponent;
-  if (exponent_type() == ON_STACK) {
-    Label base_is_smi, unpack_exponent;
-    // The exponent and base are supplied as arguments on the stack.
-    // This can only happen if the stub is called from non-optimized code.
-    // Load input parameters from stack to double registers.
-    __ LoadP(base, MemOperand(sp, 1 * kPointerSize));
-    __ LoadP(exponent, MemOperand(sp, 0 * kPointerSize));
-
-    __ LoadRoot(heapnumbermap, Heap::kHeapNumberMapRootIndex);
-
-    __ UntagAndJumpIfSmi(scratch, base, &base_is_smi);
-    __ LoadP(scratch, FieldMemOperand(base, JSObject::kMapOffset));
-    __ CmpP(scratch, heapnumbermap);
-    __ bne(&call_runtime);
-
-    __ LoadDouble(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
-    __ b(&unpack_exponent, Label::kNear);
-
-    __ bind(&base_is_smi);
-    __ ConvertIntToDouble(scratch, double_base);
-    __ bind(&unpack_exponent);
-
-    __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
-    __ LoadP(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
-    __ CmpP(scratch, heapnumbermap);
-    __ bne(&call_runtime);
-
-    __ LoadDouble(double_exponent,
-                  FieldMemOperand(exponent, HeapNumber::kValueOffset));
-  } else if (exponent_type() == TAGGED) {
+  if (exponent_type() == TAGGED) {
     // Base is already in double_base.
     __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
 
@@ -767,57 +735,6 @@ void MathPowStub::Generate(MacroAssembler* masm) {
                              double_scratch);
     __ beq(&int_exponent, Label::kNear);
 
-    if (exponent_type() == ON_STACK) {
-      // Detect square root case.  Crankshaft detects constant +/-0.5 at
-      // compile time and uses DoMathPowHalf instead.  We then skip this check
-      // for non-constant cases of +/-0.5 as these hardly occur.
-      Label not_plus_half, not_minus_inf1, not_minus_inf2;
-
-      // Test for 0.5.
-      __ LoadDoubleLiteral(double_scratch, 0.5, scratch);
-      __ cdbr(double_exponent, double_scratch);
-      __ bne(&not_plus_half, Label::kNear);
-
-      // Calculates square root of base.  Check for the special case of
-      // Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
-      __ LoadDoubleLiteral(double_scratch, -V8_INFINITY, scratch);
-      __ cdbr(double_base, double_scratch);
-      __ bne(&not_minus_inf1, Label::kNear);
-      __ lcdbr(double_result, double_scratch);
-      __ b(&done);
-      __ bind(&not_minus_inf1);
-
-      // Add +0 to convert -0 to +0.
-      __ ldr(double_scratch, double_base);
-      __ lzdr(kDoubleRegZero);
-      __ adbr(double_scratch, kDoubleRegZero);
-      __ sqdbr(double_result, double_scratch);
-      __ b(&done);
-
-      __ bind(&not_plus_half);
-      __ LoadDoubleLiteral(double_scratch, -0.5, scratch);
-      __ cdbr(double_exponent, double_scratch);
-      __ bne(&call_runtime);
-
-      // Calculates square root of base.  Check for the special case of
-      // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
-      __ LoadDoubleLiteral(double_scratch, -V8_INFINITY, scratch);
-      __ cdbr(double_base, double_scratch);
-      __ bne(&not_minus_inf2, Label::kNear);
-      __ ldr(double_result, kDoubleRegZero);
-      __ b(&done);
-      __ bind(&not_minus_inf2);
-
-      // Add +0 to convert -0 to +0.
-      __ ldr(double_scratch, double_base);
-      __ lzdr(kDoubleRegZero);
-      __ adbr(double_scratch, kDoubleRegZero);
-      __ LoadDoubleLiteral(double_result, 1.0, scratch);
-      __ sqdbr(double_scratch, double_scratch);
-      __ ddbr(double_result, double_scratch);
-      __ b(&done);
-    }
-
     __ push(r14);
     {
       AllowExternalCallThatCantCauseGC scope(masm);
@@ -884,35 +801,19 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   __ ConvertIntToDouble(exponent, double_exponent);
 
   // Returning or bailing out.
-  if (exponent_type() == ON_STACK) {
-    // The arguments are still on the stack.
-    __ bind(&call_runtime);
-    __ TailCallRuntime(Runtime::kMathPowRT);
-
-    // The stub is called from non-optimized code, which expects the result
-    // as heap number in exponent.
-    __ bind(&done);
-    __ AllocateHeapNumber(heapnumber, scratch, scratch2, heapnumbermap,
-                          &call_runtime);
-    __ StoreDouble(double_result,
-                   FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
-    DCHECK(heapnumber.is(r2));
-    __ Ret(2);
-  } else {
-    __ push(r14);
-    {
-      AllowExternalCallThatCantCauseGC scope(masm);
-      __ PrepareCallCFunction(0, 2, scratch);
-      __ MovToFloatParameters(double_base, double_exponent);
-      __ CallCFunction(
-          ExternalReference::power_double_double_function(isolate()), 0, 2);
-    }
-    __ pop(r14);
-    __ MovFromFloatResult(double_result);
-
-    __ bind(&done);
-    __ Ret();
+  __ push(r14);
+  {
+    AllowExternalCallThatCantCauseGC scope(masm);
+    __ PrepareCallCFunction(0, 2, scratch);
+    __ MovToFloatParameters(double_base, double_exponent);
+    __ CallCFunction(
+        ExternalReference::power_double_double_function(isolate()), 0, 2);
   }
+  __ pop(r14);
+  __ MovFromFloatResult(double_result);
+
+  __ bind(&done);
+  __ Ret();
 }
 
 bool CEntryStub::NeedsImmovableCode() { return true; }