Implement Math.random() purely in JavaScript.

src/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3332 matching lines @@
     VisitForStackValue(args->at(2));
     __ CallRuntime(Runtime::kLog, 2);
   }
 
   // Finally, we're expected to leave a value on the top of the stack.
   __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   context()->Plug(v0);
 }
 
 
-void FullCodeGenerator::EmitRandomHeapNumber(CallRuntime* expr) {
-  ASSERT(expr->arguments()->length() == 0);
-  Label slow_allocate_heapnumber;
-  Label heapnumber_allocated;
-
-  // Save the new heap number in callee-saved register s0, since
-  // we call out to external C code below.
-  __ LoadRoot(t6, Heap::kHeapNumberMapRootIndex);
-  __ AllocateHeapNumber(s0, a1, a2, t6, &slow_allocate_heapnumber);
-  __ jmp(&heapnumber_allocated);
-
-  __ bind(&slow_allocate_heapnumber);
-
-  // Allocate a heap number.
-  __ CallRuntime(Runtime::kNumberAlloc, 0);
-  __ mov(s0, v0);   // Save result in s0, so it is saved thru CFunc call.
-
-  __ bind(&heapnumber_allocated);
-
-  // Convert 32 random bits in v0 to 0.(32 random bits) in a double
-  // by computing:
-  // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
-  __ PrepareCallCFunction(1, a0);
-  __ lw(a0, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
-  __ lw(a0, FieldMemOperand(a0, GlobalObject::kNativeContextOffset));
-  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
-
-  // 0x41300000 is the top half of 1.0 x 2^20 as a double.
-  __ li(a1, Operand(0x41300000));
-  // Move 0x41300000xxxxxxxx (x = random bits in v0) to FPU.
-  __ Move(f12, v0, a1);
-  // Move 0x4130000000000000 to FPU.
-  __ Move(f14, zero_reg, a1);
-  // Subtract and store the result in the heap number.
-  __ sub_d(f0, f12, f14);
-  __ sdc1(f0, FieldMemOperand(s0, HeapNumber::kValueOffset));
-  __ mov(v0, s0);
-
-  context()->Plug(v0);
-}
-
-
 void FullCodeGenerator::EmitSubString(CallRuntime* expr) {
   // Load the arguments on the stack and call the stub.
   SubStringStub stub;
   ZoneList<Expression*>* args = expr->arguments();
   ASSERT(args->length() == 3);
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
   VisitForStackValue(args->at(2));
   __ CallStub(&stub);
   context()->Plug(v0);
@@ skipping 1611 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS