From 01f4fdfee71df48b427d6abbfd454c82c50cacfd Mon Sep 17 00:00:00 2001 From: Henry Gressmann Date: Mon, 22 Jan 2024 14:56:53 +0100 Subject: fix: float rounding edgecase Signed-off-by: Henry Gressmann --- crates/tinywasm/src/runtime/executor/traits.rs | 23 ++++++++++++++++++++--- crates/tinywasm/tests/generated/mvp.csv | 2 +- crates/tinywasm/tests/generated/progress-mvp.svg | 8 ++++---- 3 files changed, 25 insertions(+), 8 deletions(-) (limited to 'crates') diff --git a/crates/tinywasm/src/runtime/executor/traits.rs b/crates/tinywasm/src/runtime/executor/traits.rs index c8733d3..06aab2a 100644 --- a/crates/tinywasm/src/runtime/executor/traits.rs +++ b/crates/tinywasm/src/runtime/executor/traits.rs @@ -17,11 +17,28 @@ macro_rules! impl_wasm_float_ops { // https://webassembly.github.io/spec/core/exec/numerics.html#op-fnearest fn wasm_nearest(self) -> Self { match self { - x if x.is_nan() => x, - x if x.is_infinite() || x == 0.0 => x, + x if x.is_nan() => x, // preserve NaN + x if x.is_infinite() || x == 0.0 => x, // preserve infinities and zeros x if (0.0..=0.5).contains(&x) => 0.0, x if (-0.5..0.0).contains(&x) => -0.0, - x => x.round(), + // x => x.round(), + x => { + // Handle normal and halfway cases + let rounded = x.round(); + let diff = (x - rounded).abs(); + + if diff == 0.5 { + // Halfway case: round to even + if rounded % 2.0 == 0.0 { + rounded // Already even + } else { + rounded - x.signum() // Make even + } + } else { + // Normal case + rounded + } + } } } diff --git a/crates/tinywasm/tests/generated/mvp.csv b/crates/tinywasm/tests/generated/mvp.csv index aa28697..98a5a76 100644 --- a/crates/tinywasm/tests/generated/mvp.csv +++ b/crates/tinywasm/tests/generated/mvp.csv @@ -2,4 +2,4 @@ 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