v3.3.0

Pure optimization release. Same API, same precision, same return values to the last wei — just fewer opcodes in stdNormCDF. Every option pricer and greek built on the standard normal CDF gets the savings automatically.

What changed

• Inlined erfPositiveHalf into stdNormCDF and removed the redundant (·1/√2) · √2 round-trip. The helper had no other callers, so it's gone.
• Each branch now writes straight to the result in assembly — no shared t plumbing, no 0.5 ± half post-processing.
• Helper erfPositiveHalf and its MathWrapper external removed.
• INV_SQRT_2 constant removed (no longer used).

Gas savings

Function	v3.2.0	v3.3.0	Saved	%
stdNormCDF	734	660	−74	−10.1%
callOptionPrice	2,876	2,729	−147	−5.1%
putOptionPrice	2,887	2,739	−148	−5.1%
delta	1,797	1,724	−73	−4.1%
theta	3,441	3,293	−148	−4.3%
binaryCallPrice	2,092	2,018	−74	−3.5%
binaryPutPrice	2,097	2,023	−74	−3.5%
binaryTheta	3,501	3,353	−148	−4.2%
impliedVolatility (call)	13,100	12,370	−730	−5.6%
impliedVolatility (put)	13,184	12,446	−738	−5.6%

gamma, vega, binaryDelta, binaryGamma, binaryVega unchanged — they use the standard normal PDF, not the CDF.

Validation

• All 572 tests pass at the same precision thresholds as v3.2.0.
• Strict-equality perf assertions caught every gas drift automatically — no silent regressions or "improvements" possible.

Install

npm install defimath-lib@3.3.0

Links

• Full write-up: https://defimath.com/news/2026-06-09-defimath-v3-3-0-released/
• npm: https://www.npmjs.com/package/defimath-lib
• Compare with v3.2.0: v3.2.0...v3.3.0