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why gcc 2.95.3 generate different result with option -mips2 and -mips3

To: "linux-mips" <linux-mips@linux-mips.org>
Subject: why gcc 2.95.3 generate different result with option -mips2 and -mips3 for the same code
From: "glame" <glchen@ict.ac.cn>
Date: Tue, 14 Sep 2004 17:29:59 +0800
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
hi,
when i disassemble the code, the result is as the following

-ffffffff80010b8c:  01001021    move    $v0,$t0  (-mips2)
+ffffffff80010b8c:  0100102d    move    $v0,$t0  (-mips3)

why? 


best regards
        glame
        
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