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big: Fix sqrt, div, add with certain inputs.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:52 +02:00
parent 7afd1b15a8
commit 149c7b88df
7 changed files with 455 additions and 122 deletions
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core/math/big/logical.odin
+5 -5
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@@ -285,7 +285,7 @@ int_shrmod :: proc(quotient, remainder, numerator: ^Int, bits: int) -> (err: Err
shift := DIGIT(_DIGIT_BITS - bits);
carry := DIGIT(0);
for x := quotient.used; x >= 0; x -= 1 {
for x := quotient.used - 1; x >= 0; x -= 1 {
/*
Get the lower bits of this word in a temp.
*/
@@ -344,7 +344,7 @@ int_shr_digit :: proc(quotient: ^Int, digits: int) -> (err: Error) {
}
quotient.used -= digits;
_zero_unused(quotient);
return .None;
return clamp(quotient);
}
shr_digit :: proc { int_shr_digit, };
@@ -446,16 +446,16 @@ int_shl_digit :: proc(quotient: ^Int, digits: int) -> (err: Error) {
/*
Increment the used by the shift amount then copy upwards.
*/
quotient.used += digits;
/*
Much like `int_shr_digit`, this is implemented using a sliding window,
except the window goes the other way around.
*/
for x := quotient.used; x >= digits; x -= 1 {
quotient.digit[x] = quotient.digit[x - digits];
for x := quotient.used; x > 0; x -= 1 {
quotient.digit[x+digits-1] = quotient.digit[x-1];
}
quotient.used += digits;
mem.zero_slice(quotient.digit[:digits]);
return .None;
}