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ARM NEON vmin/vmax 命令のメモ

ARM NEON では vmin,vmax の命令には, 二種類あるのがわかりました.

vmin, vmax

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0802b/CIHDEEBE.html

入力のどちらかが NaN だと, 結果も NaN になる.
ARMv7(32bit), ARMv8 で使える.

vminnm, vmaxnm

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0802b/CIHFCJCF.html

ARMv8 以降のみ(or AARCH64). NaN の扱いがより IEEE754 準拠(?). SSE2 での min/max の振る舞いと似ている.

まとめ

aarch64 なら vminm, vmaxnm を使うのを推奨.

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