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https://opencores.org/ocsvn/lxp32/lxp32/trunk
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[/] [lxp32/] [trunk/] [verify/] [lxp32/] [src/] [firmware/] [test013.asm] - Rev 6
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/*
* Test division (divu, divs, modu, mods)
*/
lc r100, 0x10000000 // test result output pointer
lc r101, halt
lc r102, failure
lc r103, 0x10000004
// Test unsigned division
lc r32, op1
lc r33, op2
lc r34, quotient
lc r35, remainder
lc r36, cnt_loop
lc r10, 100 // counter
cnt_loop:
lw r0, r32
lw r1, r33
divu r2, r0, r1
modu r3, r0, r1
lw r4, r34
lw r5, r35
cjmpne r102, r2, r4 // failure
cjmpne r102, r3, r5 // failure
mul r6, r2, r1
add r6, r6, r3
cjmpne r102, r6, r0 // failure
add r32, r32, 4
add r33, r33, 4
add r34, r34, 4
add r35, r35, 4
sub r10, r10, 1
cjmpug r36, r10, 0 // cnt_loop
sw r103, 1
// Test signed division
lc r32, op1_signed
lc r33, op2_signed
lc r34, quotient_signed
lc r35, remainder_signed
lc r36, cnt_loop2
lc r10, 100 // counter
cnt_loop2:
lw r0, r32
lw r1, r33
divs r2, r0, r1
mods r3, r0, r1
lw r4, r34
lw r5, r35
cjmpne r102, r2, r4 // failure
cjmpne r102, r3, r5 // failure
mul r6, r2, r1
add r6, r6, r3
cjmpne r102, r6, r0 // failure
add r32, r32, 4
add r33, r33, 4
add r34, r34, 4
add r35, r35, 4
sub r10, r10, 1
cjmpug r36, r10, 0 // cnt_loop2
sw r103, 2
// Random division/multiplication test
mov r64, 1 // initial PRBS value
lc r65, 1103515245 // PRBS multiplier
lc r66, 12345 // PRBS addition constant
lc r67, 32767 // PRBS mask
lc r68, 16384
lc r10, 1000
lc r32, rnd_loop
lc r33, rand
lc r34, rnd_cont
rnd_loop:
call r33 // rand
sub r1, r0, r68 // dividend in r1
call r33 // rand
sub r2, r0, r68 // divisor in r2
cjmpne r34, r2, 0 // rnd_cont
mov r2, 1
rnd_cont:
divs r3, r1, r2
mods r4, r1, r2
mul r5, r3, r2
add r5, r5, r4
cjmpne r102, r5, r1 // failure
sub r10, r10, 1
cjmpug r32, r10, 0 // rnd_loop
sw r103, 3
sw r100, 1
jmp r101 // halt
failure:
sw r100, 2
halt:
hlt
jmp r101 // halt
// Linear congruent pseudo-random number generator (as in ISO/IEC 9899:1999)
rand:
mul r64, r64, r65
add r64, r64, r66
sru r0, r64, 16
and r0, r0, r67
ret
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