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Return Value.zero when the result of shr requires zero bits

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This commit is contained in:
Jimmi Holst Christensen 2022-01-07 18:57:39 +01:00
parent c08b190c69
commit a68e6cd3d7
1 changed files with 9 additions and 1 deletions
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10
src/value.zig
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@ -2635,9 +2635,17 @@ pub const Value = extern union {
var lhs_space: Value.BigIntSpace = undefined;
const lhs_bigint = lhs.toBigInt(&lhs_space);
const shift = @intCast(usize, rhs.toUnsignedInt());
const result_limbs = lhs_bigint.limbs.len -| (shift / (@sizeOf(std.math.big.Limb) * 8));
if (result_limbs == 0) {
// The shift is enough to remove all the bits from the number, which means the
// result is zero.
return Value.zero;
}
const limbs = try allocator.alloc(
std.math.big.Limb,
lhs_bigint.limbs.len - (shift / (@sizeOf(std.math.big.Limb) * 8)),
result_limbs,
);
var result_bigint = BigIntMutable{
.limbs = limbs,