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[Bug c/12826] Optimizer removes reference through volatile pointer
- From: "lee at bustech dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Oct 2003 16:00:13 -0000
- Subject: [Bug c/12826] Optimizer removes reference through volatile pointer
- References: <20031029145012.12826.lee@bustech.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12826
------- Additional Comments From lee at bustech dot com 2003-10-29 16:00 -------
Thanks for your reply, cdecl gives me:
cdecl> explain volatile char *sp
declare sp as pointer to volatile char
Which is what I want, a volatile char which should be read every time via sp. If
I declare sp as "volatile char *" the code reads *sp as expected. It just seems
that a cast should be equivalent to a declaration here...
Lee
P.S. Changing the assignment of "*sp = 0xE8" to "* (volatile char *) sp = 0xE8"
also fixes the problem, which seems kind of odd.