[hasumikin]

A boxed 28 | 2**64 answered 28, where CRuby answers 18446744073709551644.

Background

sp_poly_band, sp_poly_bor and sp_poly_bxor are the runtime's &, | and ^ on boxed values. The generated code calls them in these places:

• a fold by a Symbol (reduce(:|), inject(:^), and a Symbol known only at run time)
• an element's OP= on a poly Array, a poly Hash value, or a receiver of an unknown kind (a[0] |= big)

For an Integer receiver, the three read both sides as int64. A Bignum on either side so lost its high limbs:

big = 2**64
pa = [28, big, "x"]
pa.pop
p pa.reduce(:|)   # 28, CRuby 18446744073709551644
a = [28, "s"]
a[0] |= big
p a[0]            # 28, CRuby 18446744073709551644

sp_poly_bitop, the boxed a | b that the emitters use, already keeps the width.

Fix

When both sides are Integers and one is a Bignum, the three now call sp_poly_bitop. A new helper, sp_poly_bitop_wide, tells that case. The other cases do not change: two machine words, a nil or boolean receiver, two Arrays, and an operand that is not an Integer (big | 1.5 still raises the same TypeError).

The change goes in the existing functions, not in a new one. The emitters and two runtime functions (sp_poly_binop_sym, sp_poly_inject_sym) call them. A new function would need a change at each of these call sites, and the old functions would keep the wrong answer.

test/poly_bitop_bignum_width.rb covers each call site. It gives the CRuby answers under raise and promote. Before the fix, 8 of its 11 lines differed.

make gate (on this branch merged with current master)

scale-test: boxed Hash store work at 2x the methods is 1.93x (limit 2.20)
scale-test: boxed-receiver alias work at 2x the writes is 1.86x (limit 2.20)
scale-test: instance_eval forwarding work at 2x the wrappers is 1.72x (limit 2.50)
scale-test: work at 4x the program is 4.96x (linear 4.00, limit 5.40)
scale-test: work at 4x the program, compiled to C, is 6.30x (limit 6.90)
scale-test: call-shape work at 4x the units, compiled to C, is 4.29x (linear 4.00, limit 4.50)
scale-test: the analysis of a String chain at 4x the links is 4.15x (linear 4.00, limit 4.60)
Tests: 8914 pass, 0 fail, 0 error
gate: ALL GREEN

• New tests have .expected files that match CRuby 4.0 run with --enable-frozen-string-literal
• Values past 2^31 are marked # spinel: int64
• If optcarrot's generated C changed: callgrind numbers, checksum 59662
• Depends on: #

Summary by CodeRabbit

• Bug Fixes

  • Bitwise AND, OR, and XOR now preserve correct results when operations involve very large integers, including in reductions and compound assignments.
  • Operations with a non-integer operand continue to report a coercion error.

• Tests

  • Added coverage for large-integer bitwise operations across arrays, hashes, reductions, and dynamically selected operators.

[coderabbitai]

Walkthrough

The runtime now dispatches Integer-tagged bitwise operations involving Bignums through the wide bit-operation path. The regression test covers reductions, compound assignments, machine-sized operands, and a non-Integer coercion error.

Changes: Bignum bitwise width

Layer / File(s)	Summary
Wide bitwise dispatch lib/spinel_rt.h	A new helper identifies Integer/Bignum and Bignum/Bignum operand pairs. The &, `
Regression coverage test/poly_bitop_bignum_width.rb, test/poly_bitop_bignum_width.rb.expected	Tests cover Bignum reductions and compound assignments, machine-sized operands, and a non-Integer coercion error. Expected output includes the resulting values and error message.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: Moderate · up to 817b5

Mixed Integer/Bignum bitwise operations may fail during garbage collection. Root both operands before wide conversion; this risk should be resolved before merging.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: preserving Bignum operand width for boxed Integer bitwise &, |, and ^ operations.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (2 skipped: 1 unsupported, 1 too large.)

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Actionable comments posted: 1

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @lib/spinel_rt.h:
- Line 7568: Update sp_poly_bitop to root both operands before either
sp_poly_as_bigint conversion can allocate, ensuring the receiver and argument
remain reachable throughout conversion.

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Reviewing files that changed from the base of the PR and between 2814693 and 817b586.

Files selected for processing: 3

• lib/spinel_rt.h
• test/poly_bitop_bignum_width.rb
• test/poly_bitop_bignum_width.rb.expected

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