[PATCH-v2] sparc: Rename NGMP to GR740 and add configs for UT699, UT700, and GR712RC

[Jiri Gaisler]

On 07/19/2017 07:36 PM, Sebastian Huber wrote:
> ----- Jiri Gaisler <jiri at gaisler.se> schrieb:
>>
>> On 07/19/2017 04:04 PM, Sebastian Huber wrote:
>>> Hello Jiri,
>>>
>>> I fixed a couple of tests. One remaining failure on the leon2 is mathf:
>>>
>>> *** BEGIN OF TEST MATHF ***
>>> acosf          : 1.570796
>>> acoshf         : -nan
>>> asinf          : 1.570796
>>> asinhf         : 0.881374
>>> atanf          : 0.665774
>>> atan2f         : 0.785398
>>> atanhf         : inf
>>> cbrtf          : 3.000000
>>> ceilf          : 4.000000
>>> copysignf      : -3.500000
>>> cosf           : -0.000000
>>> coshf          : 2.509179
>>> erff           : 1.000000
>>> erfcf          : 0.000000
>>> expf           : 1.521962
>>> exp2f          : 1.337928
>>> expm1f         : 0.000420
>>> fabsf          : 1.123000
>>> fdimf          : 0.000000
>>> floorf         : 0.000000
>>> floorf         : -1.000000
>>>
>>> Breakpoint 1, 0x40004044 in fmaf (x=x at entry=2.0999999, y=2.20000005,
>>> z=3.00999999) at
>>> /home/EB/sebastian_h/archive/gcc-git/newlib/libm/common/sf_fma.c:25
>>> 25        return (float) (((double) x * (double) y) + (double) z);
>>> (gdb) disas 0x40004044
>>> Dump of assembler code for function fmaf:
>>>    0x40004024 <+0>:     add  %sp, -80, %sp
>>>    0x40004028 <+4>:     st  %o1, [ %sp + 0x4c ]
>>>    0x4000402c <+8>:     ld  [ %sp + 0x4c ], %f8
>>>    0x40004030 <+12>:    st  %o0, [ %sp + 0x4c ]
>>>    0x40004034 <+16>:    ld  [ %sp + 0x4c ], %f9
>>>    0x40004038 <+20>:    st  %o2, [ %sp + 0x4c ]
>>>    0x4000403c <+24>:    fsmuld  %f8, %f9, %f0
>>>    0x40004040 <+28>:    ld  [ %sp + 0x4c ], %f8
>>> => 0x40004044 <+32>:    fstod  %f8, %f8
>>>    0x40004048 <+36>:    add  %sp, 0x50, %sp
>>>    0x4000404c <+40>:    faddd  %f0, %f8, %f0
>>>    0x40004050 <+44>:    retl
>>>    0x40004054 <+48>:    fdtos  %f0, %f0
>>> End of assembler dump.
>>> (gdb) p/x $fsr
>>> $1 = 0xe660
>>>
>>> Is fstod implemented on the SIS?
>> fstod is implemented.
>>  
>> The instruction that takes the trap is at 0x40004040, which is ld  [ %sp
>> + 0x4c ], %f8. Remember that SPARC has deferred FPU trap model so it is
>> actually the previous FPU instruction FSMULD at 0x4000403c that
>> generated the trap. This instruction is not implemented in sis, and I am
>> not sure it is even implemented in some leon2/leon3 hardware. I will
>> check and report back ...
>>
>> Jiri.
>>
> I use -mcpu=leon -mfix-at697f and according to the manual we have:
>
> The AT697F floating-point unit is based on the MEIKO core and implements the SPARC floating-point instruction-set defined in the SPARC Architecture Manual version 8.

I am certain that AT697E did not implement FSMULD, whether AT697F does
it I do not know but I doubt it. On the other hand, most (all?) leon3
with an FPU does support FSMULD. Maybe somebody with an AT697F board
could run the MATHF test and report if it runs or traps. I will add
fsmuld support to sis, but we should really try to find out if it is
appropriate for leon2.

Jiri.

>