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From: | Bill Auerbach |
Subject: | [lwip-devel] [bug #27352] Change ip_addr from struct to typedef (u32_t) |
Date: | Fri, 29 Jan 2010 13:54:41 +0000 |
User-agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729) |
Follow-up Comment #7, bug #27352 (project lwip): When I looked into this, I noticed that all references to an ip_addr within a payload are within a packet and so it works out to be 32-bit aligned. I am running on an alignment required processor with the following: struct ip_addr { u32_t addr; }; There is no alignment or packing specified in this struct which makes it equivalent to replacing it with u32_t. I'm using TCP and UDP. One compiler for sure (GCC) handles this much more efficiently - it will load a 32-bit word - otherwise with packing specified it loads 4 bytes ANDing shifting and ORing into the address. _______________________________________________________ Reply to this item at: <http://savannah.nongnu.org/bugs/?27352> _______________________________________________ Message sent via/by Savannah http://savannah.nongnu.org/
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