cvs commit: ports/audio/beast Makefile

[Pietro Cerutti]

On 2011-Sep-07, 15:57, Alexey Dokuchaev wrote:
> On Wed, Sep 07, 2011 at 02:36:13PM +0000, Pietro Cerutti wrote:
> > gahr        2011-09-07 14:36:13 UTC
> > 
> >   Modified files:
> >     audio/beast          Makefile 
> >   Log:
> >   - Unbreak
> >   - Use sysctl to find out whether SSE is supported
> 
> What's wrong with .if ${MACHINE_CPU:Msse} ?

I found out that MACHINE_CPU does not reflect the actual caps of the CPU
the process is currently running on. This leads to false negative (no
sse in MACHINE_CPU on SSE-capable CPUs). Look at these outputs from a
test machine of mine:

> make -V MACHINE_CPU
i486

> sysctl hw.instruction_sse
hw.instruction_sse: 1

> grep ^CPU /var/run/dmesg.boot
CPU: Intel(R) Pentium(R) 4 CPU 1.70GHz (1694.54-MHz 686-class CPU)

> grep Features /var/run/dmesg.boot
  Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>

Unfortunately, using a sysctl here is the only reliable way I found to
determine SSE capabilities.

Any suggestions how to do it better is warmly welcome!

-- 
Pietro Cerutti
The FreeBSD Project
gahr at FreeBSD.org

PGP Public Key:
http://gahr.ch/pgp
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