HP Fortran Version 3.3 Release Notes

Inline assembly support is desirable on Itanium based systems for the following reasons:

• To allow efficient source level access to machine resources, such as Application

registers, Control Registers, and Processor Status Register.

• To efficiently carry out low level operations such as synchronization, altering the

cache state and manipulating the register stack.

• To directly exploit powerful instructions that would otherwise be difficult for the

compiler to automatically generate from source level constructs.

Extended double-precision support for selected intrinsic functions

Real*10 (corresponding to float80 in C) is now supported for selected intrinsic

functions which include some of math intrinsic functions. It is an extended

double-precision format which helps to ensure accuracy during long chains of

computations involving double precision floating point numbers.

Selected intrinsic functions that have Real*10 support are:

• ACOS

• ACOSD

• ACOSH

• ATAN

• ATAND

• ATANH

• COS

• COSD

• COSH

• SIN

• SIND

• SINH

• SQRT

• RSQRT

Performance improvement in SUM intrinsic function

At +O2 or higher optimization levels the SUM intrinsic function is inlined with different

approach if:

• ARRAY argument is an array valued expression

• DIM argument is constant

• MASK is not present.

This enhancement improves the performance of the application containing SUMintrinsic

function call which satisfies the above three conditions.