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big: Fix mul.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:52 +02:00
parent 708389a7ee
commit 13fab36639
4 changed files with 168 additions and 8 deletions
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core/math/big/basic.odin
+4 -4
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@@ -950,7 +950,7 @@ _int_mul :: proc(dest, a, b: ^Int, digits: int) -> (err: Error) {
Limit ourselves to `digits` DIGITs of output.
*/
pb := min(b.used, digits - ix);
carry := DIGIT(0);
carry := _WORD(0);
iy := 0;
/*
Compute the column of the output and propagate the carry.
@@ -959,12 +959,12 @@ _int_mul :: proc(dest, a, b: ^Int, digits: int) -> (err: Error) {
/*
Compute the column as a _WORD.
*/
column := t.digit[ix + iy] + a.digit[ix] * b.digit[iy] + carry;
column := _WORD(t.digit[ix + iy]) + _WORD(a.digit[ix]) * _WORD(b.digit[iy]) + carry;
/*
The new column is the lower part of the result.
*/
t.digit[ix + iy] = column & _MASK;
t.digit[ix + iy] = DIGIT(column & _WORD(_MASK));
/*
Get the carry word from the result.
@@ -975,7 +975,7 @@ _int_mul :: proc(dest, a, b: ^Int, digits: int) -> (err: Error) {
Set carry if it is placed below digits
*/
if ix + iy < digits {
t.digit[ix + pb] = carry;
t.digit[ix + pb] = DIGIT(carry);
}
}