[FFmpeg-devel] [PATCH] add cflags filtering rules for suncc

Michael Kostylev michael.kostylev
Mon Nov 2 21:52:03 CET 2009


On Mon Nov  2 18:16:21 2009
M?ns Rullg?rd wrote:

>>>> --- ./configure.orig
>>>> +++ ./configure
>>>> @@ -1619,6 +1619,37 @@
>>>>      cc_version="AV_STRINGIFY(__SUNPRO_C)"
>>>>      DEPEND_CMD='$(DEPCC) $(DEPFLAGS) $< | sed -e "1s,^.*: ,$@: ," -e "\$$!s,\$$, \\\," -e "1!s,^.*: , ," > $(@:.o=.d)'
>>>>      DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -xM1'
>>>> +    filter_cflags=suncc_flags
>>>> +    suncc_flags(){
>>>> +        for flag; do
>>>> +            case $flag in
>>>> +                -march=*|-mcpu=*)
>>>> +                    case "${flag#*=}" in
>>>> +                        native)                            echo -xtarget=native     ;;
>>> 
>>> We don't pass "native" directly to the compiler so it doesn't need to
>>> be handled here.  Including it for completeness doesn't hurt though.
>>
>>>> +                        v9)                                echo -xarch=sparc        ;;
>>> 
>>> Isn't it better to use -xtarget here?  That option takes more detailed
>>> chip names and sets -xarch appropriately.
>>
>> It takes a system name, e.g.
>>                     ultra, ultra2, ultra2i, ultra1/140,
>>                     ultra1/170, ultra1/200, ultra2/1170,
>>                     ultra2/1200, ultra2/1300, ultra2/2170,
>>                     ultra2/2200, ultra2/2300, ultra2e, ultra2i
>> and sets -xchip (-mtune for gcc), -xcache and -xarch. 
>> How can we guess which system is implied?
> 
> The x86 ones certainly map better to the names we use, being specific
> implementations, not general ISA levels.  Use whatever gives the most
> accurate match for each name that might be passed to configure --cpu.

-xdryrun shows the following:

target      expansion
pentium_pro -xarch=pentium_pro -xchip=pentium_pro -xcache=generic
pentium3    -xarch=sse -xchip=pentium3 -xcache=16/32/4:256/32/4
pentium4    -xarch=sse2 -xchip=pentium4 -xcache=8/64/4:256/128/8
opteron     -xarch=sse2a -xchip=opteron -xcache=64/64/2:1024/64/16
core2       -xarch=ssse3 -xchip=core2 -xcache=32/64/8:4096/64/16
penryn      -xarch=sse4_1 -xchip=penryn -xcache=32/64/8:6144/64/24
nehalem     -xarch=sse4_2 -xchip=nehalem -xcache=32/64/8:256/64/8:8192/64/16

Starting from opteron the L2 cache parameters don't look accurate enough.
Of course, -xcache can be tuned but the table will grow and grow.

Michael
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