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From: dberger@motorola.com To: gcc-gnats@gcc.gnu.org Subject: optimization/10423: -fvolatile switch not working in gcc 3.2-3 when using -O2 Date: Wed, 16 Apr 2003 17:16:00 -0000 [thread overview] Message-ID: <20030416170729.8569.qmail@sources.redhat.com> (raw) >Number: 10423 >Category: optimization >Synopsis: -fvolatile switch not working in gcc 3.2-3 when using -O2 >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed Apr 16 17:16:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: dberger@motorola.com >Release: 3.2-3 >Organization: >Environment: Cygwin and Solaris, native and cross compilers >Description: Compile with following using "gcc -O2 -fvolatile -S": void test(void) { *(char *)0x100 = 1; *(char *)0x100 = 1; *(char *)0x100 = 1; *(char *)0x100 = 1; } The definition of -fvolatile should cause four writes to be generated - always. With the 2.95 compiler that is what occurs. With the 3.2-3 compiler, only one remains after optimization. This is a serious problem for embedded, legacy programs. >How-To-Repeat: >Fix: Is there a workaround? >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-04-16 17:16 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-04-16 17:16 dberger [this message] 2003-04-16 18:06 Zack Weinberg 2003-04-21 22:36 Richard Henderson
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