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Added middle-square method PRNG for generating test data.

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cdkersey
2013-10-09 13:50:25 -04:00
parent 823a305b5d
commit 79650f18af
1 changed files with 22 additions and 0 deletions
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22
src/test/lib.s
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@@ -104,5 +104,27 @@ puts_l: ld %r6, %r7, #0;
jmpi puts_l; jmpi puts_l;
puts_end: jmpr %r5 puts_end: jmpr %r5
.global
rand: ldi %r0, #0;
ld %r0, %r0, rseed;
mul %r0, %r0, %r0;
shri %r0, %r0, #8;
ldi %r9, #0xffff;
and %r0, %r0, %r9;
ldi %r9, #0;
st %r0, %r9, rseed;
jmpr %r5;
.global
randf: ori %r10, %r5, #0;
jali %r5, rand;
ldi %r9, #1;
shli %r9, %r9, #16;
itof %r9, %r9;
itof %r0, %r0;
fdiv %r0, %r0, %r9;
jmpr %r10;
.perm rw .perm rw
rseed: .word 0xface
digstack: .space 10 digstack: .space 10