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Re: Is "-march=atom" deprecated?
- From: Mason <slash dot tmp at free dot fr>
- To: waltdnes at waltdnes dot org
- Cc: GCC help <gcc-help at gcc dot gnu dot org>
- Date: Tue, 4 Oct 2016 10:50:45 +0200
- Subject: Re: Is "-march=atom" deprecated?
- Authentication-results: sourceware.org; auth=none
- References: <20160928231454.GA21018@waltdnes.org> <8610e4a4-0e60-1633-f245-3f8051473487@redhat.com> <20160930030411.GA31976@waltdnes.org> <57F21F85.3060802@free.fr> <20161003224010.GA18009@waltdnes.org>
On 04/10/2016 00:40, waltdnes wrote:
> On Mon, Oct 03, 2016 at 11:06:13AM +0200, Mason wrote
>
>> It does look like 'atom' and 'bonnell' are similar.
>>
>> I don't have 4.9 handy, try this:
>>
>> echo | gcc -xc -S -fverbose-asm -march=atom -o v1.s -
>> echo | gcc -xc -S -fverbose-asm -march=bonnell -o v2.s -
>> diff -u v1.s v2.s
>>
>> Maybe they are identical?
>
> Thanks for the idea. I had to do it a bit differently to get it to
> work. I took a simple "Hello World" program, and ran...
For my personal education, can you tell me in what way the commands
above failed to work? (You did copy the trailing dash, right?)
> gcc -xc -S -fverbose-asm -march=atom -o v1.s hello.c
> gcc -xc -S -fverbose-asm -march=bonnell -o v2.s hello.c
For the record, -xc means "the input is C source code".
It is only required when compiling stdin, not when providing a .c file
(gcc has a trivial heuristic for .c files)
Regards.