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The following are results for two compilers we use. The tests include John Bray's suggestion of array_sum3(x,s): 1. LF95 on a 400MHz Wintel box f77 loop, contiguous array, sum =32831.363300 time = 1.036057 f77 loop, stride 2x2 array, sum =32831.363300 time = 1.314553 f90 loop, contiguous array, sum =32831.363300 time = 0.943559 f90 loop, stride 2x2 array, sum =32831.363300 time = 1.538168 f90 SUM(contgiguous array), sum =32831.367200 time = 0.890322 f90 SUM(stride 2x2 array), sum =32831.367200 time = 1.527924 2. Compaq Fortran V7.2-780 on an AXP 275 MHz box: f77 loop, contiguous array, sum =32850.292969 time = 2.000000 f77 loop, stride 2x2 array, sum =32850.292969 time = 3.840000 f90 loop, contiguous array, sum =32850.292969 time = 2.000000 f90 loop, stride 2x2 array, sum =32850.292969 time = 3.570000 f90 SUM(contgiguous array), sum =32850.292969 time = 1.820000 f90 SUM(stride 2x2 array), sum =32850.292969 time = 3.330000 Regards, Graham Kipp Principal Engineer, Reliability and Market Models VENCorp Email: [log in to unmask] Phone: (613) 9481 9296 Mobile: 0418 610 898 Fax: (613) 9481 9123 > -----Original Message----- > From: Friedrich Hertweck [mailto:[log in to unmask]] > Sent: Thursday, June 01, 2000 7:45 PM > To: Van Snyder > Cc: [log in to unmask] > Subject: Re: What do compilers do about assumed-shape dummy arguments? > <snip> > > Below is a program that does a very simple thing: add the > values of an array and > return it. > There are four versions of subroutines to do this: > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%