--- old/src/share/vm/opto/divnode.cpp Mon Oct 13 11:02:48 2008 +++ new/src/share/vm/opto/divnode.cpp Mon Oct 13 11:02:47 2008 @@ -710,11 +710,18 @@ if( t2 == TypeD::ONE ) return t1; - // If divisor is a constant and not zero, divide them numbers - if( t1->base() == Type::DoubleCon && - t2->base() == Type::DoubleCon && - t2->getd() != 0.0 ) // could be negative zero - return TypeD::make( t1->getd()/t2->getd() ); +#if defined(IA32) + if (!phase->C->method()->is_strict()) + // Can't trust native compilers to properly fold strict double + // multiplication with round-to-zero on this platform. +#endif + { + // If divisor is a constant and not zero, divide them numbers + if( t1->base() == Type::DoubleCon && + t2->base() == Type::DoubleCon && + t2->getd() != 0.0 ) // could be negative zero + return TypeD::make( t1->getd()/t2->getd() ); + } // If the dividend is a constant zero // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) --- old/src/share/vm/opto/mulnode.cpp Mon Oct 13 11:02:50 2008 +++ new/src/share/vm/opto/mulnode.cpp Mon Oct 13 11:02:49 2008 @@ -152,6 +152,14 @@ if( t1 == Type::BOTTOM || t2 == Type::BOTTOM ) return bottom_type(); +#if defined(IA32) + // Can't trust native compilers to properly fold strict double + // multiplication with round-to-zero on this platform. + if (op == Op_MulD && phase->C->method()->is_strict()) { + return TypeD::DOUBLE; + } +#endif + return mul_ring(t1,t2); // Local flavor of type multiplication } @@ -360,7 +368,7 @@ // Compute the product type of two double ranges into this node. const Type *MulDNode::mul_ring(const Type *t0, const Type *t1) const { if( t0 == Type::DOUBLE || t1 == Type::DOUBLE ) return Type::DOUBLE; - // We must be adding 2 double constants. + // We must be multiplying 2 double constants. return TypeD::make( t0->getd() * t1->getd() ); }