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improved f64 cast to i64 #88

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improved f64 cast to i64 #88

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b156b48
better f64 cast to i64
austinorr Mar 16, 2026
bfd4575
match self round call pattern
austinorr Mar 17, 2026
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41 changes: 15 additions & 26 deletions src/ops/f64.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -683,22 +683,17 @@ impl_op! {
impl_op! {
fn cast_i64<f64> {
for Avx2(a: __m256d) -> __m256i {
let nums_arr = core::mem::transmute::<__m256d, [f64; 4]>(a);
let ceil = [
nums_arr[0].m_round() as i64,
nums_arr[1].m_round() as i64,
nums_arr[2].m_round() as i64,
nums_arr[3].m_round() as i64,
];
core::mem::transmute::<_, __m256i>(ceil)
// Round in SIMD, then extract for i64 conversion (no native cvtpd_epi64 before AVX-512)
let rounded = Self::round(a);
let arr = core::mem::transmute::<__m256d, [f64; 4]>(rounded);
let result = [arr[0] as i64, arr[1] as i64, arr[2] as i64, arr[3] as i64];
core::mem::transmute::<_, __m256i>(result)
}
for Sse41(a: __m128d) -> __m128i {
let nums_arr = core::mem::transmute::<__m128d, [f64; 2]>(a);
let ceil = [
nums_arr[0].m_round() as i64,
nums_arr[1].m_round() as i64,
];
core::mem::transmute::<_, __m128i>(ceil)
let rounded = Self::round(a);
let arr = core::mem::transmute::<__m128d, [f64; 2]>(rounded);
let result = [arr[0] as i64, arr[1] as i64];
core::mem::transmute::<_, __m128i>(result)
}
for Sse2(a: __m128d) -> __m128i {
let nums_arr = core::mem::transmute::<__m128d, [f64; 2]>(a);
Expand All @@ -712,20 +707,14 @@ impl_op! {
a.m_round() as i64
}
for Neon(a: float64x2_t) -> int64x2_t {
let nums_arr = core::mem::transmute::<float64x2_t, [f64; 2]>(a);
let ceil = [
nums_arr[0].m_round() as i64,
nums_arr[1].m_round() as i64,
];
core::mem::transmute::<_, int64x2_t>(ceil)
let rounded = vrndnq_f64(a);
vcvtq_s64_f64(rounded)
}
for Wasm(a: v128) -> v128 {
let nums_arr = core::mem::transmute::<_, [f64; 2]>(a);
let ceil = [
nums_arr[0].m_round() as i64,
nums_arr[1].m_round() as i64,
];
core::mem::transmute::<_, v128>(ceil)
let rounded = f64x2_nearest(a);
let arr = core::mem::transmute::<_, [f64; 2]>(rounded);
let result = [arr[0] as i64, arr[1] as i64];
core::mem::transmute::<_, v128>(result)
}
}
}
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