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optimization/6233: simple loop miscompilation
- From: amodra at bigpond dot net dot au
- To: gcc-gnats at gcc dot gnu dot org
- Date: 9 Apr 2002 04:27:06 -0000
- Subject: optimization/6233: simple loop miscompilation
>Number: 6233
>Category: optimization
>Synopsis: simple loop miscompilation
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Apr 08 21:36:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Alan Modra
>Release: 3.2 20020408 (experimental)
>Organization:
IBM
>Environment:
configured with: /src/gcc-current/configure --prefix=/usr/local --build=i686-linux --host=i686-linux --target=i686-linux --disable-nls --enable-shared --enable-languages=c,c++
>Description:
function call incorrectly moved out of loop at -O2.
>How-To-Repeat:
testcase distilled from binutils sources
extern char *p;
static int
is_end_of_statement ()
{
return *p == '\n' || *p == ';' || *p == '!';
}
void foo (void)
{
while (!is_end_of_statement ())
p++;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: