PPC: Clean up copy args loop in Generate_JSConstructStubHelper.

src/ppc/builtins-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug.h"
@@ skipping 623 matching lines @@
 
     // Restore the parameters.
     if (use_new_target) {
       __ Pop(r4, ip);
     } else {
       __ pop(r4);
     }
 
     // Retrieve smi-tagged arguments count from the stack.
     __ LoadP(r6, MemOperand(sp));
-    __ SmiUntag(r3, r6);
 
     // Push new.target onto the construct frame. This is stored just below the
     // receiver on the stack.
     if (use_new_target) {
       __ Push(ip, r7, r7);
     } else {
       __ Push(r7, r7);
     }
 
     // Set up pointer to last argument.
     __ addi(r5, fp, Operand(StandardFrameConstants::kCallerSPOffset));
 
     // Copy arguments and receiver to the expression stack.
-    // r3: number of arguments
     // r4: constructor function
     // r5: address of last argument (caller sp)
     // r6: number of arguments (smi-tagged)
     // sp[0]: receiver
     // sp[1]: receiver
     // sp[2]: new.target (if used)
     // sp[2/3]: number of arguments (smi-tagged)
     Label loop, no_args;
-    __ cmpi(r3, Operand::Zero());
-    __ beq(&no_args);
+    __ SmiUntag(r3, r6, SetRC);
+    __ beq(&no_args, cr0);
     __ ShiftLeftImm(ip, r3, Operand(kPointerSizeLog2));
+    __ sub(sp, sp, ip);
     __ mtctr(r3);
     __ bind(&loop);
     __ subi(ip, ip, Operand(kPointerSize));
     __ LoadPX(r0, MemOperand(r5, ip));
-    __ push(r0);
+    __ StorePX(r0, MemOperand(sp, ip));
     __ bdnz(&loop);
     __ bind(&no_args);
 
     // Call the function.
     // r3: number of arguments
     // r4: constructor function
     if (is_api_function) {
       __ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
       Handle<Code> code = masm->isolate()->builtins()->HandleApiCallConstruct();
       __ Call(code, RelocInfo::CODE_TARGET);
@@ skipping 1214 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC