### view lab4/test/gcd.p @ 0:bfdcc3820b32

Basis
author Mike Spivey Thu, 05 Oct 2017 08:04:15 +0100
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```(* Euclid's algorithm *)

var x, y: integer;

begin
x := 3 * 37; y := 5 * 37;
while x <> y do
if x > y then
x := x - y
else
y := y - x
end
end;
print_num(x); newline()
end.

(*<<
37
>>*)

(*[[
@ picoPascal compiler output
.include "fixup.s"
.global pmain

.text
pmain:
mov ip, sp
stmfd sp!, {r4-r10, fp, ip, lr}
mov fp, sp
@   x := 3 * 37; y := 5 * 37;
mov r0, #111
set r1, _x
str r0, [r1]
mov r0, #185
set r1, _y
str r0, [r1]
.L2:
@   while x <> y do
set r4, _x
ldr r5, [r4]
set r0, _y
ldr r6, [r0]
cmp r5, r6
beq .L4
@     if x > y then
cmp r5, r6
ble .L6
@       x := x - y
sub r0, r5, r6
str r0, [r4]
b .L2
.L6:
@       y := y - x
set r4, _y
ldr r0, [r4]
set r1, _x
ldr r1, [r1]
sub r0, r0, r1
str r0, [r4]
b .L2
.L4:
@   print_num(x); newline()
set r0, _x
ldr r0, [r0]
bl print_num
bl newline
ldmfd fp, {r4-r10, fp, sp, pc}
.ltorg

.comm _x, 4, 4
.comm _y, 4, 4
@ End
]]*)```