making if conditions faster

I'm trying to get this function to work and to run faster. It takes as input a matrix, and checks to see if x and y are both greater than 0 but less than 10. Having it run faster is also key because it currently takes long with all of these conditional statements

m 
   x  y
B -1 -1
C 50 11
D 50  5
A 51 10

val_10 = 10
myfun(m, val_10)

and the output should looks like this

     [,1] [,2]
[1,]    0   0
[2,]   10   10
[3,]   10    5
[4,]   10   10

but instead it looks like this

     [,1] [,2]
[1,]    0   -1
[2,]   10   11
[3,]   10    5
[4,]   10   10

m[1,2] should be 0 and m[2,2] should be 10 in the output

myfun looks like this

myfun = function(m, val_10){
v = matrix(NA, nrow = nrow(m), ncol = 2)
for (i in 1:nrow(m) ) {
    old = m[i, ]

    #check if smaller than 0
    if (m[i,1] < 0) {
        m[i, ] = c(0, old[2])
    }

    #check if bigger than val_10
    else if (m[i,1] > val_10 ){ 
        m[i, ] = c(val_10, old[2] )
    }

    #check if smaller than 0
    else if (m[i, 2] < 0){
        m[i, ] = c(old[1], 0)
    }

    #check if bigger than val_10
    else if (m[i, 2] > val_10){
        m[i, ] = c(old[1], val_10 )
    }

    v[i,] = m[i, ]
}
return(v)
}