This is the mail archive of the gcc-help@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Curious global variable bug? Bad assumptions on my part?

Tynan Wilke wrote: 
So, the -O0 is doing what I would expect, but the -O1 version IS
testing the global variable the first pass, but then never jumping
back to the 0x0804853a to retrieve the new global value and then
re-test. Is this right?

That sounds right. Because GCC thinks the value is never going to change, it doesn't ever bother to look at it again after the first check.

--
Tony Wetmore


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]