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big: Fix internal_int_mod for inputs with opposite signs.

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This threw off Frobenius-Underwood.
This commit is contained in:
Jeroen van Rijn
2021-09-03 14:50:26 +02:00
parent 11ae87cc2f
commit 70e12f7a1c
4 changed files with 37 additions and 13 deletions
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core/math/big/prime.odin
+2 -2
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@@ -185,14 +185,14 @@ internal_int_kronecker :: proc(a, p: ^Int, allocator := context.allocator) -> (k
a1.digit[0] + 1 cannot overflow because the MSB
of the DIGIT type is not set by definition.
*/
if a1.digit[0] + 1 & p1.digit[0] & 2 != 0 {
if ((a1.digit[0] + 1) & p1.digit[0] & 2) != 0 {
k = -k;
}
} else {
/*
Compute k = (-1)^((a1-1)*(p1-1)/4) * k.
*/
if a1.digit[0] & p1.digit[0] & 2 != 0 {
if (a1.digit[0] & p1.digit[0] & 2) != 0 {
k = -k;
}
}