On 2015-04-08 09:19, Pengfei Yuan wrote:
You're right, I had been looking at the wrong paragraph in the info manual. Sorry about any confusion.2015-04-08 20:06 GMT+08:00 Austin S Hemmelgarn <[email protected]>:I can't remember any off the top of my head, but it does say explicitly in the GCC manual to be careful with -O3. IIRC, most of the issues relate to -O3 enabling -ffast-math (which tends to really mess with code that expects strict IEEE 754 compliance), so it may not be as much of an issue for kernel code. You might look into some of the projects that use -O3 by default (I think most of the Mozilla so0ftware does these days, and I know that there are others, I just can't remember what right now).I am afraid you are talking about -Ofast, not -O3. See https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html Yuan
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