1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
program matmul
integer N,i,j,k
real*8 a(10,10), b(10,10), c(10,10), ct(10,10),mysum
do i=1,10,1
do j=1,10,1
a(i,j) = i+j
b(i,j) = i-j
c(i,j) = 0.0
ct(i,j) = 0.0
end do
b(i,i) = 1.0;
end do
DO j=1,10,1
DO k=1,10,1
DO i=1,10,1
c(i,j) = c(i,j)+a(i,k)*b(k,j)
end do
end do
end do
call gemm(10,a,b,ct)
mysum = 0.0
do i=1,10,1
do j=1,10,1
mysum = c(i,j) - ct(i,j)
end do
end do
if (abs(mysum) >= 0.00001) then
write (*,*) "Something wrong"
else
write (*,*) "Output matches"
end if
end program matmul
SUBROUTINE gemm(N,A,B,C)
INTEGER N
REAL*8 A(N,N), B(N,N), C(N,N)
INTEGER I,J,K
DO J=1,N,1
DO K=1,N,1
DO I=1,N,1
C(I,J) = C(I,J)+A(I,K)*B(K,J)
end do
end do
end do
END subroutine
|
