Comments (4)
walbourn
commented on May 18, 2024
Per the Intel SSE4 guide, _mm_round_ps by itself can match ceil, floor, trunc, rint, and nearbyint. You need a little more to get it to match roundf.
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walbourn
commented on May 18, 2024
ARM v8's FRINTN also performs banker's rounding, which I'll be using for the ARM64 implementation.
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walbourn
commented on May 18, 2024
The bug here is actually that the NO_INTRINSICS path on VS 2013+ should not be using roundf because all the other implementations are using round-to-nearest (even). It might be nice to offer an alternative round function that uses the roundf half-way round away from zero rules, but such a round wouldn't be a single instruction for SSE4 or ARM-NEON--filed as new issue.
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walbourn
commented on May 18, 2024
Fixed for DirectXMath 3.10
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Related Issues (20)
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