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optimization/7735: omit asm code
- From: spigel at olvs dot miee dot ru
- To: gcc-gnats at gcc dot gnu dot org
- Date: 27 Aug 2002 12:59:36 -0000
- Subject: optimization/7735: omit asm code
- Reply-to: spigel at olvs dot miee dot ru
>Number: 7735
>Category: optimization
>Synopsis: omit asm code
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Tue Aug 27 06:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Sergei Pachkov
>Release: gcc 3.2 20020826
>Organization:
>Environment:
binutils 2.13.90 20020826
linux i686
gcc configured with opts: "--enable-threads --enable-languages=c,c++ --disable-nls --with-elf --with-gnu-ld --with-gnu-as"
>Description:
I am write little program, source in report.tgz/main.c(in report attachment).
I am try compile my program with compiler options
a) "-O0 -g0" and
b) "-O2 -g0".
after a) my program output two hex number == e6a2c480,
after b) program report two different number( e6a2c480 and 80484d3). Second number(80...) may be some other number but not equal a first number.
after look asm code( output from "gcc -S" )
I see omit part of my code in case b). Omitted part is important part of my programm.
Why gcc generate wrong code in case b) ?
>How-To-Repeat:
gcc -O0 main.c -o main
gcc -O2 main.c -o main.opt
$ ./main
$ ./main.opt
or look preprocessed asm output:
gcc -O0 -g0 -S main.c -o main.s
gcc -O2 -g0 -S main.c -o main.opt.s
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="report.tgz"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="report.tgz"
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