Newsgroups: comp.unix.ultrix
Path: utzoo!utgpu!watserv1!idallen@watcgl.waterloo.edu
From: idallen@watcgl.uwaterloo.ca (Ian! D. Allen [CGL])
Subject: Ultrix 3.1 VAX C Compiler blows up doing real math
Message-ID: <9009120241.AA27417@watcgl.waterloo.edu>
Sender: root@watserv1.waterloo.edu (Operator)
Organization: University of Waterloo
Date: Tue, 11 Sep 90 22:41:04 EDT
Lines: 33

The following C++ function was generated by the local "Maple" symbolic
computation language.  See how the C Compiler gives up?  Here we are
in the 1990's and people still don't know how to write programs
without artificial limits in them.

Script started on Tue Sep 11 15:23:22 1990
% make
CC +w -D__ATT2__ -I/usr/watcgl/projects/Splines/Code/CGL/include -I/p/Splines/Code/CGL/include/FuncBasis  -L/usr/watcgl/projects/Splines/Code/CGL/lib -g -c Func3.cc
CC  +w Func3.cc:
cc  -c  -L/usr/watcgl/projects/Splines/Code/CGL/lib -g Func3.c
"Func3.cc", line 21: compiler error: out of tree space; simplify expression
*** Error code 1

Stop.
% more Func3.cc 
#include <VecMtx/dvec.h>
#include <VecMtx/dgemat.h>

double f_3_1_0_0(DoubleVec& d, DGEMatrix *A)
{
double       t1 = pow(d[2],2.0);
double       t2 = pow(d[0],2.0);
double       t3 = A[2][2][2]*d[2];
double       t6 = A[2][2][1]*d[2];
double       t14 = A[2][1][1]*A[2][2][2]*t1;
double       t18 = pow(d[1],2.0);
double       t27 = t18*d[1];
double       t46 = d[1]*t14;
double       t74 = 2.0*t1/(4.0*t2*t3+2.0*t2*d[1]*t6+4.0*t2*d[1]*A[2][1][1]+4.0*d[0]*A [1][1][1]*t14+4.0*A[1][1][1]*t18*d[0]*t6+8.0*A[1][1][1]*t18*d[0]*A[2][1][1]+2.0*t27*A[1][2][2]*t6+4.0*t27*A[1][2][2]*A[2][1][1]+8.0*A[1][2][2]*d[2]*A[2][2][2] *t18+t27*d[0]*A[1][2][1]*t6+2.0*t27*d[0]*A[1][2][1]*A[2][1][1]+2.0*d[0]*A[1][2] [1]*t46+4.0*t18*d[0]*A[1][2][1]*t3+12.0*A[1][1][1]*d[1]*d[0]*t3+4.0*A[1][2][2]*t46)*A[2][2][2]*A[2][1][1]*(d[0]*A[1][2][1]*d[1]+2.0*A[1][2][2]*d[1]+2.0*d[0]*A[1][1][1]);
return (t74); 
}
% 
script done on Tue Sep 11 15:24:41 1990