From 2cef86b7eca2dbf96cda5909de27754249dc9259 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <kwojtus@protonmail.com>
Date: Thu, 25 Apr 2019 13:01:35 +0200
Subject: create function for measuring, make selection of mul implementations
 possible

---
 src/main.F90 | 75 +++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 51 insertions(+), 24 deletions(-)

diff --git a/src/main.F90 b/src/main.F90
index 2649e10..43eeabb 100644
--- a/src/main.F90
+++ b/src/main.F90
@@ -4,41 +4,33 @@ PROGRAM mul
   USE dotmat
   IMPLICIT none
 
-  real(kind=4), dimension(:,:), allocatable :: mat1, mat2, res
-  real :: start, end
-  integer :: dim = 10
+  integer, parameter :: seed = 123456
+  real :: time
+  integer :: dim = 10, multype = 1, realtype = 4
 
   DO WHILE (dim < 2000)
-     
-     call init_random_seed(123456)
-
-     allocate(mat1(dim,dim))
-     allocate(mat2(dim,dim))
-     allocate(res(dim,dim))
-
-     call random_number(mat1)
-     call random_number(mat2)
-
-     call cpu_time(start)
 
-     res = naivmull(mat1, mat2)
+     SELECT CASE(realtype)
+        CASE (4)
+           time = measure_4(dim)
+        ! CASE (8)
+        !    time = measure_8(dim)
+        ! CASE (16)
+        !    time = measure_16(dim)
+        CASE default
+           write (*, *) "wrong kind for real: ", realtype
 
-     call cpu_time(end)
-
-     print '(I11," ",ES11.5)', dim, end - start
+     END SELECT
+        
+     print '(I11," ",ES11.5)', dim, time
 
      dim = dim * 2
-
-     deallocate(mat1)
-     deallocate(mat2)
-     deallocate(res)
      
   END DO
 
 CONTAINS
 
-  SUBROUTINE init_random_seed(seed)
-    integer, intent(in) :: seed
+  SUBROUTINE init_random_seed()
     integer :: i, n
     
     call random_seed(size = n)
@@ -46,5 +38,40 @@ CONTAINS
     call random_seed(put = (/ ((seed + i) * 37, i = 1, n) /))
     
   END SUBROUTINE init_random_seed
+  
+
+  real FUNCTION measure_4(dim) result(time)
+    integer, intent(in) :: dim
+    real(kind=4), dimension(:,:), allocatable :: mat1, mat2, res
+    real :: start, end
 
+    call init_random_seed()
+
+    allocate(mat1(dim,dim))
+    allocate(mat2(dim,dim))
+    allocate(res(dim,dim))
+
+    call random_number(mat1)
+    call random_number(mat2)
+
+    call cpu_time(start)
+
+    SELECT CASE(multype)
+       CASE (1)
+          res = naivmull(mat1, mat2)
+       CASE (2)
+          res = bettmull(mat1, mat2)
+       CASE (3)
+          res = dotmull(mat1, mat2)
+       CASE default
+          res = matmul(mat1, mat2)
+       
+    END SELECT
+
+    call cpu_time(end)
+    
+    time = end - start
+    
+  END FUNCTION measure_4
+  
 END PROGRAM mul
-- 
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