[問題] 最快的平方法?
因為我的程式演算法中用到很多 "平方"
目前想的到最快的大概就是 x * x
試過 inline asm 了, 似乎還慢一點
請問還有什麼撇步有可能比 x * x 還快的嗎?
需求是 double 浮點數, 感謝
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◆ From: 220.132.126.29
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請問Q.15是什麼 orz
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... 我想...去拆的過程可能就已經太慢了 XD
我當時是用
_asm
{
fld TMPa1
fld TMPa1
fmul
fstp TMPa1
}
跟
_asm
{
movq xmm0, TMPa1
movq xmm1, xmm0
mulpd xmm0, xmm1
movq TMPa1, xmm0
}
結果好像都比 TMPa1 * TMPa1 慢一點點....
※ 編輯: wahaha99 來自: 220.132.126.29 (10/11 09:42)
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