[PATCH] Fix is_amd64_regs_target check in i386-avx512.exp

[PATCH] Fix is_amd64_regs_target check in i386-avx512.exp

[Simon Marchi]

As reported by Jan here:

  https://sourceware.org/ml/gdb-patches/2018-09/msg00831.html

the check that sets the number of available registers seems backwards.
I can't test this patch however, since I don't have access to a cpu with
AVX512.  Could somebody perhaps from Intel, or somebody else that has
access to such CPU, take a look?

Alternatively, do you know if a machine in the GCC compile farm has this
feature?  I didn't find any, but maybe I didn't look enough.

gdb/testsuite/ChangeLog:

	* gdb.arch/i386-avx512.exp: Fix setting of nr_regs based on
	is_amd64_regs_target.
---
 gdb/testsuite/gdb.arch/i386-avx512.exp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/testsuite/gdb.arch/i386-avx512.exp b/gdb/testsuite/gdb.arch/i386-avx512.exp
index de2f62c3e1f..f27af534cfd 100644
--- a/gdb/testsuite/gdb.arch/i386-avx512.exp
+++ b/gdb/testsuite/gdb.arch/i386-avx512.exp
@@ -93,9 +93,9 @@ gdb_test "break [gdb_get_line_number "third breakpoint here"]" \
 gdb_continue_to_breakpoint "continue to third breakpoint in main"
 
 if [is_amd64_regs_target] {
-    set nr_regs 8
-} else {
     set nr_regs 32
+} else {
+    set nr_regs 8
 }
 
 for { set r 0 } { $r < $nr_regs } { incr r } {
-- 
2.19.0

RE: [PATCH] Fix is_amd64_regs_target check in i386-avx512.exp

[Metzger, Markus T]

Hello Simon,

> As reported by Jan here:
> 
>   https://sourceware.org/ml/gdb-patches/2018-09/msg00831.html
> 
> the check that sets the number of available registers seems backwards.
> I can't test this patch however, since I don't have access to a cpu with AVX512.
> Could somebody perhaps from Intel, or somebody else that has access to such
> CPU, take a look?

It indeed is backwards.

The current test fails badly when run with -m32.

 
> gdb/testsuite/ChangeLog:
> 
> 	* gdb.arch/i386-avx512.exp: Fix setting of nr_regs based on
> 	is_amd64_regs_target.
> ---
>  gdb/testsuite/gdb.arch/i386-avx512.exp | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/gdb/testsuite/gdb.arch/i386-avx512.exp
> b/gdb/testsuite/gdb.arch/i386-avx512.exp
> index de2f62c3e1f..f27af534cfd 100644
> --- a/gdb/testsuite/gdb.arch/i386-avx512.exp
> +++ b/gdb/testsuite/gdb.arch/i386-avx512.exp
> @@ -93,9 +93,9 @@ gdb_test "break [gdb_get_line_number "third breakpoint
> here"]" \  gdb_continue_to_breakpoint "continue to third breakpoint in main"
> 
>  if [is_amd64_regs_target] {
> -    set nr_regs 8
> -} else {
>      set nr_regs 32
> +} else {
> +    set nr_regs 8
>  }
> 
>  for { set r 0 } { $r < $nr_regs } { incr r } {
> --
> 2.19.0

With your patch, the test only fails for zmm registers due to broken XSAVE
handling.  This is fixed by Jan's patch.  With both patches together, the test
passes for -m32.

Regards,
Markus.

Intel Deutschland GmbH
Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de
Managing Directors: Christin Eisenschmid, Christian Lamprechter
Chairperson of the Supervisory Board: Nicole Lau
Registered Office: Munich
Commercial Register: Amtsgericht Muenchen HRB 186928

Re: [PATCH] Fix is_amd64_regs_target check in i386-avx512.exp

[Simon Marchi]

On 2018-10-01 05:49, Metzger, Markus T wrote:
> Hello Simon,
> 
>> As reported by Jan here:
>> 
>>   https://sourceware.org/ml/gdb-patches/2018-09/msg00831.html
>> 
>> the check that sets the number of available registers seems backwards.
>> I can't test this patch however, since I don't have access to a cpu 
>> with AVX512.
>> Could somebody perhaps from Intel, or somebody else that has access to 
>> such
>> CPU, take a look?
> 
> It indeed is backwards.
> 
> The current test fails badly when run with -m32.
> 
> 
>> gdb/testsuite/ChangeLog:
>> 
>> 	* gdb.arch/i386-avx512.exp: Fix setting of nr_regs based on
>> 	is_amd64_regs_target.
>> ---
>>  gdb/testsuite/gdb.arch/i386-avx512.exp | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/gdb/testsuite/gdb.arch/i386-avx512.exp
>> b/gdb/testsuite/gdb.arch/i386-avx512.exp
>> index de2f62c3e1f..f27af534cfd 100644
>> --- a/gdb/testsuite/gdb.arch/i386-avx512.exp
>> +++ b/gdb/testsuite/gdb.arch/i386-avx512.exp
>> @@ -93,9 +93,9 @@ gdb_test "break [gdb_get_line_number "third 
>> breakpoint
>> here"]" \  gdb_continue_to_breakpoint "continue to third breakpoint in 
>> main"
>> 
>>  if [is_amd64_regs_target] {
>> -    set nr_regs 8
>> -} else {
>>      set nr_regs 32
>> +} else {
>> +    set nr_regs 8
>>  }
>> 
>>  for { set r 0 } { $r < $nr_regs } { incr r } {
>> --
>> 2.19.0
> 
> With your patch, the test only fails for zmm registers due to broken 
> XSAVE
> handling.  This is fixed by Jan's patch.  With both patches together, 
> the test
> passes for -m32.

Thanks a lot, I pushed it!

Simon