src/cpu/x86/vm/interpreter_x86_32.cpp

rev 3227 : 7133857: exp() and pow() should use the x87 ISA on x86
Summary: use x87 instructions to implement exp() and pow() in interpreter/c1/c2.
Reviewed-by:

*** 179,188 ****
--- 179,201 ----
          __ flog10();
          // Store to stack to convert 80bit precision back to 64bits
          __ push_fTOS();
          __ pop_fTOS();
          break;
+     case Interpreter::java_lang_math_pow:
+       __ fld_d(Address(rsp, 3*wordSize)); // second argument
+       __ pow_or_exp(false, 0);
+       // Store to stack to convert 80bit precision back to 64bits
+       __ push_fTOS();
+       __ pop_fTOS();
+       break;
+     case Interpreter::java_lang_math_exp:
+       __ pow_or_exp(true, 0);
+       // Store to stack to convert 80bit precision back to 64bits
+       __ push_fTOS();
+       __ pop_fTOS();
+       break;
      default                              :
          ShouldNotReachHere();
    }
  
    // return double result in xmm0 for interpreter and compilers.