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Wall Street ended Tuesday mixed, with an analyst’s upgrade of General Motors Corp. carrying the Dow Jones industrials to a fresh six-year high and within reach of its best-ever close. Dell Inc.’s profit warning put a dent in the tech sector.

According to preliminary calculations, the Dow rose 55.23, or 0.48 percent, to 11,639.77. The index of 30 blue-chip stocks is about 80 points from its all-time closing high of 11,722.98, reached Jan. 14, 2000. The Standard & Poor’s 500 index added 0.48, or 0.04 percent, to 1,325.14, and the Nasdaq composite index slid 6.74, or 0.29 percent, to 2,338.25.

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DTS Inc. jumped 11 percent to $21.73. IMCO Tech Inc. rose 8.6 percent to $9.28. Chad Therapeutics Inc. was up 8 percent to $3. Diodes Inc., which was upgraded to “buy” from “neutral” at UBS, rose 5.7 percent to $38.49. IXXA, which was upgraded to “buy” from “hold” at Canaccord Adams, was up 4.8 percent. Homestore Inc., which was rated a “buy” in new coverage at Needham & Co., rose 7 percent.

Enova Systems Inc., which reported earnings Tuesday, dropped 8.8 percent to $4.33. IndyMac Bancorp Inc., which was downgraded to “sell” from “neutral” at Banc of America, fell 4.8 percent to $47.68. First Consulting Group Inc. was off 4 percent to $7.60. Valueclick Inc., which reported earnings Monday, was down 3.5 percent to $17.16.