jimzah/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2024-11-30 09:02:32 +00:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Fix unexpected truncation behavior with comptime_int larger than u64 range (#9303)

Browse Source 
Closes #9299
This commit is contained in:
leesongun 2021-07-06 18:42:18 +09:00 committed by GitHub
parent 6c11e9bb07
commit cff7ecee07
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/stage1/bigint.cpp
View File

@ -88,8 +88,11 @@ static void to_twos_complement(BigInt *dest, const BigInt *op, size_t bit_count)
size_t digits_to_copy = bit_count / 64;
size_t leftover_bits = bit_count % 64;
dest->digit_count = digits_to_copy + ((leftover_bits == 0) ? 0 : 1);
if (dest->digit_count == 1 && leftover_bits == 0) {
if (dest->digit_count == 1) {
dest->data.digit = op_digits[0];
if (leftover_bits != 0) {
dest->data.digit &= (1ULL << leftover_bits) - 1;
}
if (dest->data.digit == 0) dest->digit_count = 0;
return;
}

2
test/behavior/truncate.zig
View File

@ -54,4 +54,6 @@ test "truncate on comptime integer" {
try expect(y == 0xabcd);
var z = @truncate(i16, -65537);
try expect(z == -1);
var w = @truncate(u1, 1 << 100);
try expect(w == 0);
}