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fix listSublist bitcode

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This commit is contained in:
Tom Dohrmann 2022-03-11 11:32:20 +01:00
parent cdf19e3feb
commit 17398e4f45
1 changed files with 11 additions and 2 deletions
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13
compiler/builtins/bitcode/src/list.zig
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@ -887,14 +887,23 @@ pub fn listSublist(
}
const keep_len = std.math.min(len, size - start);
const drop_len = std.math.max(start, 0);
const drop_start_len = start;
const drop_end_len = size - (start + keep_len);
// Decrement the reference counts of elements before `start`.
var i: usize = 0;
while (i < drop_len) : (i += 1) {
while (i < drop_start_len) : (i += 1) {
const element = source_ptr + i * element_width;
dec(element);
}
// Decrement the reference counts of elements after `start + keep_len`.
i = 0;
while (i < drop_end_len) : (i += 1) {
const element = source_ptr + (start + keep_len + i) * element_width;
dec(element);
}
const output = RocList.allocate(alignment, keep_len, element_width);
const target_ptr = output.bytes orelse unreachable;