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ud.adb
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ud.adb
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-- =======================================================
-- Ada WCET Benchmark v.1.0
-- University of Padua
-- emezzett@math.unipd.it
-- =======================================================
-- Porting to Ada of C WCET becnhmark from:
--
-- Mälardalen WCET research group:
-- http://www.mrtc.mdh.se/projects/wcet/benchmarks.html
--
-- SNU-RT Benchmark Suite for Worst Case Timing Analysis
-- Real-Time Research Group, Seoul National University
-- S.-S. Lim (sslim@archi.snu.ac.kr)
-- =======================================================
-- with Ada.Exceptions; use Ada.Exceptions;
-- with System.IO; use System.IO;
package body Ud is
procedure Ud_main is
nmax : Integer := 50;
n : Integer := 5;
chkerr : Integer;
w : long_double;
begin
for i in 1 .. n loop
w := 0.0;
for j in 1 .. n loop
a (i, j) := long_double ((i + 1) + (j + 1));
if (i = j) then
a (i, j) := a (i, j) *2.0;
end if;
w := w + a (i, j);
end loop;
b (i) := w;
end loop;
chkerr := Ludcmp (nmax, n);
end Ud_main;
function Ludcmp (nmax : Integer; n : Integer) return Integer is
i, j, k : Integer := 1;
w : long_double;
y : Long_Dbl_Array (1 .. 100);
begin
for i in 1 .. n loop
for j in i + 1 ..n loop
w := a (j, i);
if (i /= 1) then
for k in 1 .. i loop
w := w - (a (j, k) * a (k, i));
end loop;
end if;
a (j, i) := w / a (i, i);
end loop;
for j in i + 1 ..n loop
w := a (i + 1, j);
for k in 1 .. i loop
w := w - (a (i + 1, k) * a(k, j));
end loop;
a (i + 1, j) := w;
end loop;
end loop;
y (1) := b (1);
for i in 1 .. n loop
w := b (i);
for j in 1 .. i loop
w := w - (a (i, j) * y (j));
end loop;
y (i) := w;
end loop;
x (n) := y (n) / a (n, n);
for i in reverse 1 .. (n -1) loop
w := y (i);
for j in i + 1 ..n loop
w := w - (a (i, j) * x (j));
end loop;
-- Put_line("a(i,i)= " & Float'Image(Float(a(i,i))));
x (i) := w / a(i, i);
end loop;
return 1;
-- exception
-- when Error : others =>
-- Put_Line("---> " & Ada.Exceptions.Exception_Name(Error));
-- return 3;
end Ludcmp;
end Ud;