% now checks at run time whether both operands are integers (dividend
|x| <= 2^53, nonzero integer divisor) when the integer-range analysis
cannot prove it, and then uses i64 srem with JS sign-of-zero semantics;
fractions, NaN, Infinity, zero divisors and huge dividends keep frem.
Proven integers whose divisor may be zero now only check for zero.
push() appends inline while len < cap (the runtime append is exactly a
dense store at len plus len+1 there) and keeps a cold runtime call that
grows storage otherwise. Element writes were already inlined by H04.
Built on the H04 commits cherry-picked from perf/h04-array-reads
(d88b58a1, a6057a52, 9109cb5a, 657aa3fb). New corpus programs
3150-integer-remainder and 3151-array-push-writes.
Marginal vs perf/h04-array-reads, 15 runs:
| workload | macOS | Linux (focused) |
| numeric-kernels | -18.3% | -10.3% |
| functional-pipeline | -8.8% | -4.3% |
| template-render | -2.9% | (layout, sweep -0.6%) |
| alloc-trees | -2.0% | (layout, sweep +0.3%) |
| records-sort | -1.5% | -0.3% |
| csv-numbers | -0.3% | +0.1% |
geomean marginal: macOS -2.8%, Linux full -0.6%.
vs perf/harness (incl. H04): macOS -14.4% (1.222x Node),
Linux -16.0% (1.160x Node). Linux .text growth <= 3.6%.
Tests: LLVM differential corpus 2008/2008 (Linux, 6 shards, release+dev),
sanitized 3140/3150/3151 pass, backend+ir unit tests pass except one
load-flaky zig COFF cache test that passes in isolation.
