src/share/vm/opto/library_call.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:

@@ -1524,13 +1524,10 @@
 
   // If this inlining ever returned NaN in the past, we do not intrinsify it
   // every again.  NaN results requires StrictMath.exp handling.
   if (too_many_traps(Deoptimization::Reason_intrinsic))  return false;
 
-  // Do not intrinsify on older platforms which lack cmove.
-  if (ConditionalMoveLimit == 0)  return false;
-
   _sp += arg_size();        // restore stack pointer
   Node *x = pop_math_arg();
   Node *result = _gvn.transform(new (C, 2) ExpDNode(0,x));
 
   //-------------------

@@ -1769,19 +1766,15 @@
 
     // These intrinsics are supported on all hardware
   case vmIntrinsics::_dsqrt: return Matcher::has_match_rule(Op_SqrtD) ? inline_sqrt(id) : false;
   case vmIntrinsics::_dabs:  return Matcher::has_match_rule(Op_AbsD)  ? inline_abs(id)  : false;
 
-    // These intrinsics don't work on X86.  The ad implementation doesn't
-    // handle NaN's properly.  Instead of returning infinity, the ad
-    // implementation returns a NaN on overflow. See bug: 6304089
-    // Once the ad implementations are fixed, change the code below
-    // to match the intrinsics above
-
   case vmIntrinsics::_dexp:  return
+    Matcher::has_match_rule(Op_ExpD) ? inline_exp(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dexp), "EXP");
   case vmIntrinsics::_dpow:  return
+    Matcher::has_match_rule(Op_PowD) ? inline_pow(id) :
     runtime_math(OptoRuntime::Math_DD_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dpow), "POW");
 
    // These intrinsics are not yet correctly implemented
   case vmIntrinsics::_datan2:
     return false;