Adding log files to gcc dump and adding testcase-rtl

Adding log files to gcc dump and adding testcase-rtl

[RICHU NORMAN]

[-- Attachment #1: Type: text/plain, Size: 650 bytes --]

Hi,
I am a beginner in gcc. I am trying to add an instruction to riscv-gcc.It
would be helpful could help with a few tips .
1.How to write comments to rtl or create a custom log file to log comments
to rtl dump?
2.How to run testsuite ?
3.Is there a way to directly run an rtl test case? Like giving rtl input
and checking the generated asm.(Like in the attachment which is posted in
bugzilla[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82815 ])
Please suggest a way to run the gcc-testsuite with these cases. Pfa



-- 
Richu Norman
Research Scholar
Department of Computer Science
Cochin University of Science and Technology
Ph : (+91)-8848455627

[-- Attachment #2: testcase_read-rtl.c --]
[-- Type: text/x-c-code, Size: 3109 bytes --]

/* { dg-do compile } */
/* { dg-options "-march=armv7e-m -mfloat-abi=hard -mfpu=fpv5-d16" } */

double __RTL (startwith ("mach")) foo (void)
{
(function "foo"
  (insn-chain
    (cnote 1 NOTE_INSN_DELETED)
    (cnote 3 [bb 2] NOTE_INSN_BASIC_BLOCK)
    (cinsn/f 16 (parallel [
                    (set (mem/c:BLK (pre_modify:SI (reg/f:SI sp)
                                (plus:SI (reg/f:SI sp)
                                    (const_int -8))) [1  A8])
                        (unspec:BLK [
                                (reg:SI r4)
                            ] UNSPEC_PUSH_MULT))
                    (use (reg/f:SI r7))
                ]) "foo.c":2
             (expr_list:REG_FRAME_RELATED_EXPR (sequence [
                        (set/f (reg/f:SI sp)
                            (plus:SI (reg/f:SI sp)
                                (const_int -8)))
                        (set/f (mem/c:SI (reg/f:SI sp) [1  S4 A32])
                            (reg:SI r4))
                        (set/f (mem/c:SI (plus:SI (reg/f:SI sp)
                                    (const_int 4)) [1  S4 A32])
                            (reg/f:SI r7))
                    ])))
    (cinsn/f 17 (set (reg/f:SI r7)
                (plus:SI (reg/f:SI sp)
                    (const_int 0))) "foo.c":2)
    (cnote 18 NOTE_INSN_PROLOGUE_END)
    (cnote 2 NOTE_INSN_FUNCTION_BEG)
    (cinsn 5 (set (reg:DF r3 [orig:110 _1 ] [110])
                (const_double:DF 1.0e+0 [0x0.8p+1])) "foo.c":3)
    (cinsn 8 (set (reg:DF s14 [orig:111 <retval> ] [111])
                (reg:DF r3 [orig:110 _1 ] [110])) "foo.c":3)
    (cinsn 12 (set (reg/i:DF s0)
                (reg:DF s14 [orig:111 <retval> ] [111])) "foo.c":4)
    (cinsn 13 (use (reg/i:DF s0)) "foo.c":4)
    (cnote 19 NOTE_INSN_EPILOGUE_BEG)
    (cinsn 20 (unspec_volatile [
                    (const_int 0)
                ] VUNSPEC_BLOCKAGE) "foo.c":4)
    (cinsn/f 21 (set (reg/f:SI sp)
                (reg/f:SI r7)) "foo.c":4
             (expr_list:REG_CFA_ADJUST_CFA (set (reg/f:SI sp)
                    (reg/f:SI r7))))
    (cinsn 22 (unspec:SI [
                    (reg/f:SI sp)
                ] UNSPEC_REGISTER_USE) "foo.c":4)
    (cinsn/f 23 (parallel [
                    (set/f (reg/f:SI sp)
                        (plus:SI (reg/f:SI sp)
                            (const_int 8)))
                    (set/f (reg:SI r4)
                        (mem/c:SI (reg/f:SI sp) [1  S4 A32]))
                    (set/f (reg/f:SI r7)
                        (mem/c:SI (plus:SI (reg/f:SI sp)
                                (const_int 4)) [1  S4 A32]))
                ]) "foo.c":4
             (expr_list:REG_CFA_ADJUST_CFA (set (reg/f:SI sp)
                    (plus:SI (reg/f:SI sp)
                        (const_int 8)))
                (expr_list:REG_CFA_RESTORE (reg/f:SI r7)
                    (expr_list:REG_CFA_RESTORE (reg:SI r4)))))
    (cjump_insn 24 (simple_return) "foo.c":4)
    (cbarrier 25)
    (cnote 15 NOTE_INSN_DELETED)
  ) ;; insn-chain
  (crtl
    (return_rtx 
      (reg/i:DF s0)
    ) ;; return_rtx
  ) ;; crtl
) ;; function "foo"
}

Re: Adding log files to gcc dump and adding testcase-rtl

[David Malcolm]

On Wed, 2022-05-25 at 10:25 +0530, RICHU NORMAN wrote:
> Hi,
> I am a beginner in gcc. I am trying to add an instruction to riscv-
> gcc.It
> would be helpful could help with a few tips .

Hi Richu - welcome to GCC development.

FWIW I've written a guide for new GCC contributors which you might find
helpful:
  https://gcc-newbies-guide.readthedocs.io/en/latest/index.html

Caveat: I'm much more familiar with the frontends/diagnostics, rather
than the backends/RTL, so there may be a "frontend" bias in that guide.
 
> 1.How to write comments to rtl or create a custom log file to log
> comments
> to rtl dump?
> 2.How to run testsuite ?
> 3.Is there a way to directly run an rtl test case? Like giving rtl
> input
> and checking the generated asm.(Like in the attachment which is
> posted in
> bugzilla[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82815 ])
> Please suggest a way to run the gcc-testsuite with these cases. Pfa

I wrote some notes on dealing with the testsuite, and on running
individual cases here:
https://gcc-newbies-guide.readthedocs.io/en/latest/working-with-the-testsuite.html

Hope this is helpful; good luck
Dave

Re: Adding log files to gcc dump and adding testcase-rtl

[David Malcolm]

On Wed, 2022-05-25 at 06:44 -0400, David Malcolm wrote:
> On Wed, 2022-05-25 at 10:25 +0530, RICHU NORMAN wrote:
> > Hi,
> > I am a beginner in gcc. I am trying to add an instruction to riscv-
> > gcc.It
> > would be helpful could help with a few tips .
> 
> Hi Richu - welcome to GCC development.
> 
> FWIW I've written a guide for new GCC contributors which you might find
> helpful:
>   https://gcc-newbies-guide.readthedocs.io/en/latest/index.html
> 
> Caveat: I'm much more familiar with the frontends/diagnostics, rather
> than the backends/RTL, so there may be a "frontend" bias in that guide.
>  
> > 1.How to write comments to rtl or create a custom log file to log
> > comments
> > to rtl dump?
> > 2.How to run testsuite ?
> > 3.Is there a way to directly run an rtl test case? Like giving rtl
> > input
> > and checking the generated asm.(Like in the attachment which is
> > posted in
> > bugzilla[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82815 ])
> > Please suggest a way to run the gcc-testsuite with these cases. Pfa
> 
> I wrote some notes on dealing with the testsuite, and on running
> individual cases here:
> https://gcc-newbies-guide.readthedocs.io/en/latest/working-with-the-testsuite.html

Looks like that bug relates to a bug in the __RTL reading code (which I
wrote; sorry!).  There are some notes on running cc1 under the debugger
in my guide here:
  https://gcc-newbies-guide.readthedocs.io/en/latest/debugging.html
which should let you put a breakpoint on the relevant code and step
through it.

Some note on __RTL testcases: you will generally want to have a
"startswith" clause on the __RTL to indicate which compilation pass the
RTL was saved at, since RTL goes through several stages in the backend.

"git grep __RTL" should show some examples of existing __RTL-based
testcases.

See also:
  https://gcc.gnu.org/onlinedocs/gccint/RTL-Tests.html

Dave

Re: Adding log files to gcc dump and adding testcase-rtl

[RICHU NORMAN]

This is great, thank you so much!
I am also looking for support regarding adding instructions for the target
machine.



On Wed, May 25, 2022 at 4:14 PM David Malcolm <dmalcolm@redhat.com> wrote:

> On Wed, 2022-05-25 at 10:25 +0530, RICHU NORMAN wrote:
> > Hi,
> > I am a beginner in gcc. I am trying to add an instruction to riscv-
> > gcc.It
> > would be helpful could help with a few tips .
>
> Hi Richu - welcome to GCC development.
>
> FWIW I've written a guide for new GCC contributors which you might find
> helpful:
>   https://gcc-newbies-guide.readthedocs.io/en/latest/index.html
>
> Caveat: I'm much more familiar with the frontends/diagnostics, rather
> than the backends/RTL, so there may be a "frontend" bias in that guide.
>
> > 1.How to write comments to rtl or create a custom log file to log
> > comments
> > to rtl dump?
> > 2.How to run testsuite ?
> > 3.Is there a way to directly run an rtl test case? Like giving rtl
> > input
> > and checking the generated asm.(Like in the attachment which is
> > posted in
> > bugzilla[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82815 ])
> > Please suggest a way to run the gcc-testsuite with these cases. Pfa
>
> I wrote some notes on dealing with the testsuite, and on running
> individual cases here:
>
> https://gcc-newbies-guide.readthedocs.io/en/latest/working-with-the-testsuite.html
>
> Hope this is helpful; good luck
> Dave
>
>

-- 
Richu Norman
Research Scholar
Department of Computer Science
Cochin University of Science and Technology
Ph : (+91)-8848455627

Re: Adding log files to gcc dump and adding testcase-rtl

[David Malcolm]

On Wed, 2022-05-25 at 16:32 +0530, RICHU NORMAN wrote:
> This is great, thank you so much!

You're welcome.

> I am also looking for support regarding adding instructions for the
> target
> machine.

That's something I've not done (my expertise is mostly in the frontends
and diagnostics).

With that caveat, I believe the official documentation is here:
  https://gcc.gnu.org/onlinedocs/gccint/Machine-Desc.html

FWIW one of my colleagues wrote a series of posts about how to add an
entirely new CPU to the GNU toolchain here (originally called "ggx",
but now "moxie"):
  http://atgreen.github.io/ggx/
though that's from 2008 so might be out-of-date, and covers the whole
toolchain, not just GCC, so might be overwhelming.

Hope this is helpful
Dave


> 
> 
> 
> On Wed, May 25, 2022 at 4:14 PM David Malcolm <dmalcolm@redhat.com>
> wrote:
> 
> > On Wed, 2022-05-25 at 10:25 +0530, RICHU NORMAN wrote:
> > > Hi,
> > > I am a beginner in gcc. I am trying to add an instruction to riscv-
> > > gcc.It
> > > would be helpful could help with a few tips .
> > 
> > Hi Richu - welcome to GCC development.
> > 
> > FWIW I've written a guide for new GCC contributors which you might
> > find
> > helpful:
> >   https://gcc-newbies-guide.readthedocs.io/en/latest/index.html
> > 
> > Caveat: I'm much more familiar with the frontends/diagnostics, rather
> > than the backends/RTL, so there may be a "frontend" bias in that
> > guide.
> > 
> > > 1.How to write comments to rtl or create a custom log file to log
> > > comments
> > > to rtl dump?
> > > 2.How to run testsuite ?
> > > 3.Is there a way to directly run an rtl test case? Like giving rtl
> > > input
> > > and checking the generated asm.(Like in the attachment which is
> > > posted in
> > > bugzilla[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82815 ])
> > > Please suggest a way to run the gcc-testsuite with these cases. Pfa
> > 
> > I wrote some notes on dealing with the testsuite, and on running
> > individual cases here:
> > 
> >  
> > https://gcc-newbies-guide.readthedocs.io/en/latest/working-with-the-testsuite.html
> > 
> > Hope this is helpful; good luck
> > Dave
> > 
> > 
>