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Build # 22665542916

Build Type

push

github

Committed by Buristan

Commit Message

DUALNUM: Improve/fix edge cases of unary minus.

Thanks to Sergey Kaplun.

(cherry picked from commit 707c12bf0)

In a single-number build (default for x86/x64), `-(0)` is always `-0`
due to its number type. However, in DUALNUM mode, the `0` may have the
integer type, and for this integer, `BC_UNM` has no effect. `0` may be
represented via number or integer type, where the resulting `0` is
constructed during initial parsing (`lj_strscan_scan()`) or arithmetic
operations (`BC_MODVV`). This inconsistency may break the JIT semantics
and lead to the assertion failure in the `lj_check_slots()`.

This patch fixes the incorrect `BC_UNM` for integer operand 0. Also, the
narrowing optimization for the unary minus should be more strict to
avoid incorrect narrowing for integer slots and make JIT intact with the
VM semantics.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#12134

Run Details

5711 of 6046 branches covered (94.46%)

Branch coverage included in aggregate %.

2 of 2 new or added lines in 1 file covered. (100.0%)

7 existing lines in 2 files now uncovered.

21811 of 23512 relevant lines covered (92.77%)

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