Whirlwind negates Haste too, as per the feat description:<br/><div class="quoteheader"><div class="topslice_quote">Quote</div></div><blockquote class="bbc_standard_quote">Benefit<br/>When you use the full attack action, you can give up your regular attacks and instead make one melee attack at your full base attack bonus against each opponent within reach. <br/><br/>When you use the Whirlwind Attack feat, you also forfeit any bonus or extra attacks granted by other feats, <strong>spells</strong>, or abilities. <br/><br/></blockquote><div class="quotefooter"><div class="botslice_quote"></div></div><br/>Haste, as a spell, is thus unfortunately negated.