From owner-cvs-all  Fri Dec  4 02:52:09 1998
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From: Doug Rabson <dfr@FreeBSD.ORG>
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	Fri, 4 Dec 1998 02:52:48 -0800 (PST)
Date: Fri, 4 Dec 1998 02:52:48 -0800 (PST)
Message-Id: <199812041052.CAA10885@freefall.freebsd.org>
To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/alpha/alpha fp_emulate.c ieee_float.c
         ieee_float.h machdep.c trap.c vm_machdep.c src/sys/alpha/conf
         files.alpha src/sys/alpha/include fpu.h inst.h pcb.h
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dfr         1998/12/04 02:52:48 PST

  Modified files:
    sys/alpha/alpha      machdep.c trap.c vm_machdep.c 
    sys/alpha/conf       files.alpha 
    sys/alpha/include    pcb.h 
  Added files:
    sys/alpha/alpha      fp_emulate.c ieee_float.c ieee_float.h 
    sys/alpha/include    fpu.h inst.h 
  Log:
  Implement 'software completion' for floating point arithmetic.  On the
  alpha, operations involving non-finite numbers or denormalised numbers
  or operations which should generate such numbers will cause an arithmetic
  exception.  For programs which follow some strict code generation rules,
  the kernel trap handler can then 'complete' the operation by emulating
  the faulting instruction.
  
  To use software completion, a program must be compiled with the arguments
  '-mtrap-precision=i' and '-mfp-trap-mode=su' or '-mfp-trap-mode=sui'.
  Programs compiled in this way can use non-finite and denormalised numbers
  at the expense of slightly less efficient code generation of floating
  point instructions.  Programs not compiled with these options will receive
  a SIGFPE signal when non-finite or denormalised numbers are used or
  generated.
  
  Reviewed by: John Polstra <jdp@polstra.com>
  
  Revision  Changes    Path
  1.25      +10 -5     src/sys/alpha/alpha/machdep.c
  1.7       +8 -5      src/sys/alpha/alpha/trap.c
  1.5       +13 -1     src/sys/alpha/alpha/vm_machdep.c
  1.14      +3 -2      src/sys/alpha/conf/files.alpha
  1.2       +2 -1      src/sys/alpha/include/pcb.h

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