Original	Instruction count (As reported by the modified version of SPIM)	Optimized Version (register allocation)	Instruction count (As reported by the modified version of SPIM)	Improvement (%)	Optimized Version (const propagation + live + peephole)	Instruction count (As reported by the modified version of SPIM)	Improvement (%)	Input
file1.spim	53	file1.mod	38	28%	file1.mod2	38	28% (+ 0%)	123
file2.spim	58	file2.mod	19	67%	file2.mod2	19	67% (+ 0%)	N/A
file3.spim	120	file3.mod	71	41%	file3.mod2	64	47% (+ 6%)	N/A
file4.spim	97	file4.mod	95	2%	file4.mod2	96	1% (- 1%)	4,1,9
file5.spim	1344	file5.mod	1293	4%	file5.mod2	1245	7% (+ 3%)	N/A
array.spim	65	array.mod	35	46%	array.mod2	35	46% (+ 0%)	N/A
block.spim	40	block.mod	20	50%	block.mod2	20	50% (+ 0%)	N/A
three.spim	43	three.mod	34	21%	three.mod2	34	21% (+ 0%)	N/A
expr.spim	40	expr.mod	14	65%	expr.mod2	14	65% (+ 0%)	N/A
for.spim	237	for.mod	237	0%	for.mod2	234	1% (+ 1%)	12
io.spim	41	io.mod	40	2%	io.mod2	40	2% (+ 0%)	123,123
array2.spim	75	array2.mod	45	40%	array2.mod2	45	40% (+ 0%)	N/A
sort.spim	640	sort.mod	619	3%	sort.mod2	619	3% (+ 0%)	5,1,32,4,5,6
while.spim	264	while.mod	252	5%	while.mod2	234	11% (+ 6%)	N/A
sort2.spim	925	sort2.mod	882	5%	sort2.mod2	845	9% (+ 4%)	5,1,3,2,4,5
strange.spim	281	strange.mod	214	24%	strange.mod2	192	32% (+ 8%)	30
primes.spim	277,822	primes.mod	263,516	5%	primes.mod2	214795	23% (+ 18%)	N/A
bigtest.spim	123,561,100 (yes, 123 million)	bigtest.mod	119,571,534	3%	bigtest.mod2	99,677,478	19% (+ 16%)	199933,220,284, 6,28,8128